MIL-PRF-23377H

NOT MEASUREMENT

SENSITIVEMIL-PRF-23377H30 April 2002SUPERSEDINGMIL-PRF-23377G30 September 1999

PERFORMANCE SPECIFICATIONPRIMER COATINGS: EPOXY, HIGH-SOLIDS

This specification is approved for use by all Departments and Agencies of the Departmentof Defense.1. SCOPE

1.1 Scope. This specification covers the requirements for corrosion inhibiting, chemical andsolvent resistant, solvent-borne, epoxy primer coatings that have a maximum volatile

organic compound (VOC) content of 340 grams per liter (g/L)(2.8 pounds per gallon [lb/gal]).1.2 Classification. The primer coatings will be of the following types and classes, asspecified (see 6.2):

1.2.1 Types. The types of primer coatings are as follows: Type I Type II

--Standard pigments

Low infrared reflective pigments

1.2.2 Classes. The classes of primer coatings are as follows: Class C Class N

--Strontium chromate based corrosion inhibitorsNon-chromate based corrosion inhibitors

Beneficial comments (recommendations, additions, deletions) and any pertinent data whichmay be of use in improving this document should be addressed to: Commander, Naval AirWarfare Center Aircraft Division, Code 414100B120-3, Highway 547, Lakehurst, NJ08733-5100, by using the Standardization Document Improvement Proposal (DD Form1426) appearing at the end of this document or by letter.

AMSC N/AFSC 8010DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Downloaded from http://www.everyspec.com on 2010-04-15T5:39:51.

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2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 ofthis specification. This section does not include documents cited in other sections of this

specification or recommended for additional information or as examples. While every effort hasbeen made to ensure the completeness of this list, document users are cautioned that they mustmeet all specified requirements documents cited in sections 3 and 4 of this specification, whetheror not they are listed.

2.2 Government documents.2.2.1 Specifications and standards. The following specifications and standards form a partof this document to the extent specified herein. Unless otherwise specified, the issues of thesedocuments are those listed in the issue of the Department of Defense Index of Specifications andStandards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2).

SPECIFICATIONS

DEPARTMENT OF DEFENSEMIL-C-5541MIL-C-8514MIL-A-8625MIL-PRF-23699MIL-T-81772MIL-PRF-83282MIL-PRF-85285STANDARDSFEDERALFED-STD-141FED-STD-595

--Paint, Varnish, Lacquer and Related Materials: Methods ofInspection, Sampling and Testing

Colors Used in Government Procurement-------Chemical Conversion Coatings on Aluminum and AluminumAlloys

Coating Compound, Metal Pretreatment, Resin-AcidAnodic Coatings, for Aluminum and Aluminum AlloysLubricating Oil, Aircraft Turbine Engine, Synthetic Base,NATO Code Number 0-156Thinner, Aircraft Coating

Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base,Metric, NATO Code Number H-537Coating: Polyurethane, High-Solids

(Unless otherwise indicated, copies of the above specifications and standards are availablefrom the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia,PA 19111-5094.)

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2.3 Non-Government publications. The following documents form a part of this documentto the extent specified herein. Unless otherwise specified, the issues of the documents which areDoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unlessotherwise specified, the issues of documents not listed in the DoDISS are the issues of thedocuments cited in the solicitation (see 6.2).

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM-B117-Salt Spray (Fog) Apparatus, Operating. (DoD adopted)ASTM-D1200 -Cup, Viscosity by Ford Viscosity. (DoD adopted)

ASTM-D1210-Fineness Of Dispersion Of Pigment-Vehicle Systems By Hegman-Type

Gage. (DoD adopted)

ASTM-D1296-Solvents and Diluents, Volatile, Odor of. (DoD adopted)

ASTM-D10-Organic Coating, Drying, Curing, or Film Formation of at Room

Temperature. (DoD adopted)

ASTM-D19-Strontium Chromate Pigment

ASTM-D1849-Paint, Package Stability of. (DoD adopted)

ASTM-D2803-Metal, Organic Coatings on, Filiform Corrosion Resistance of. (DoD

adopted)

ASTM-D3335-Lead, Cadmium, and Cobalt in Paint by Atomic Absorption

Spectroscopy, Test for Low Concentrations of. (DoD adopted)

ASTM-D3718-Paint, Chromium in, by Atomic Absorption Spectroscopy, Low

Concentrations of. (DoD adopted)

ASTM-D3742-1,1,1-Trichloroethane Content

ASTM-D3924- Paint, Varnish, Lacquer, and Related Materials, Conditioning and

Testing, Standard Environment for. (DoD adopted)

ASTM-D3960-Paints and Related Coatings, Determining Volatile Organic Compound

(VOC) Content of. (DoD adopted)(Application for copies should be addressed to the American Society for Testing andMaterials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)

AMERICAN SOCIETY FOR QUALITY CONTROL (ASQC)ASQC-Z1.4

-Procedures, Sampling and Tables for Inspection by Attributes.(DoD adopted)

(Application for copies should be addressed to the American Society for Quality Control,P.O. Box 3005, 611 East Wisconsin Avenue, Milwaukee, WI 53201-4606.)

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SOCIETY OF AUTOMOTIVE ENGINEERS (SAE)SAE-AMS10

SAE-AMS-QQ-A-250/4SAE-AMS-QQ-A-250/5

- Compound, Corrosion Removing for Aircraft Surfaces- Aluminum Alloy 2024, Plate and Sheet. (DoD adopted)- Aluminum Alloy Alclad 2024, Plate and Sheet. (DoDadopted)

(Application for copies should be addressed to the Society of Automotive Engineers,400 Commonwealth Drive, Warrendale, PA 15096-0001.)

2.4 Order of precedence. In the event of a conflict between the text of this document andthe references cited herein, the text of this document takes precedence. Nothing in this document,however, supersedes applicable laws and regulations unless a specific exemption has beenobtained.

3. REQUIREMENTS

3.1 Qualification. The primer coating furnished under this specification shall be a productthat is authorized by the qualifying activity for listing on the applicable qualified products listbefore contract award (see 4.2 and 6.3).

3.2 Material. Materials used in the manufacture of the primer coating supplied under thisspecification shall be of such a quality as to produce products conforming to the requirements ofthis specification.

3.3 Toxicity. The primer coating supplied under this specification shall have no adverseeffect on the health of personnel (see 6.9), when used for its intended purpose and with theprecautions listed in 3.11.

3.4 Composition. The primer coating shall consist of two components, as follows:Component A - a base component composed of epoxy resin and solvents

Component B - a curing agent containing polyamide or amine resin and solventsComponent B shall act as the curing agent for component A. The components shall be packagedseparately and furnished as a kit (see 6.7.1). When the components are mixed in the proportionsspecified by the manufacturer, a primer coating meeting the requirements of this specification shallresult. Chlorinated solvents, except for para-chlorotrifluoromethylbenzene or equal, shall beprohibited in the formulation of this primer coating. Incidental cadmium and cadmium

compounds shall be not greater than one part per million (ppm). The non-volatile portion shallcontain not more than 0.06 percent by weight of lead metal or lead compounds.

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3.4.1 Pigment.3.4.1.1 Class C. Coatings containing strontium chromate conforming to ASTM-D19 asthe corrosion inhibitor, along with extenders and other pigments, shall be identified as class C.3.4.1.2 Class N. Coatings containing non-chromium corrosion inhibitors, along withextenders and other pigments, shall be identified as class N. Incidental chromium content of classN shall be not greater than 5 ppm (see 4.5).

3.4.2 Volatile organic compound (VOC) solvent content. The VOC content of admixedprimer coatings shall be not greater than 340 g/L (2.8 lb/gal). The resistivity of the solvents shallpermit application of the coating by electrostatic spray application (see 4.5).

3.4.2.1 Thinner compatibility. The admixed primer coatings shall be compatible with thinnerconforming to MIL-T-81772, type II (see 6.11).

3.5 Physical properties – components before mixing.3.5.1 Fineness of grind. The fineness of grind of the pigmented component shall be 5 orgreater on the Hegman scale (see 4.5).

3.5.2 Condition in container. Components A and B shall be free of grit, seeds, lumps,abnormal thickening or livering, and shall not show pigment flotation nor excessive settling. Theyshall mix to a smooth, homogeneous, and pourable condition. In addition, the containers shallexhibit no deformation (see 4.5.1).

3.5.3 Storage stability. The primer coating components, as packaged by the manufacturer,shall meet all requirements of this specification after storage for not less than one year (see 4.5).3.5.4 Accelerated storage stability. The primer coating, as packaged by the manufacturer,shall meet all requirements of this specification after storage for 14 days (see 4.5.2). Thecontainer shall not become deformed or the lid shall not become unsealed during the storageperiod.

3.6 Physical properties - admixed components.3.6.1 Color.3.6.1.1 Type I. The color of the admixed type I primer coating shall be the natural color ofthe corrosion inhibiting pigments used, except that tinting to a darker shade is permitted.

3.6.1.2 Type II. The color of the admixed type II primer coating shall be dark green or gray.5

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3.6.2 Odor. The odor of the admixed coating, wet or dry, shall be characteristic of thesolvents used (see 4.5).

3.6.3 Viscosity. Immediately after mixing components A and B, the maximum viscosity ofthe unthinned, admixed primer coating shall be 40 seconds through a #4 Ford cup (see 4.5).3.6.4 Pot life. After mixing and storage at room temperature in a closed container (see 4.5)for 4 hours, the maximum viscosity of the unthinned primer coating from 3.6.3 shall be 70seconds through a #4 Ford cup (see 4.5).

3.7 Physical properties - film.3.7.1 Surface appearance. The admixed primer coating, applied to a vertical surface, shallnot sag, run, or streak. The dried film shall have a smooth, uniform surface free of grit, seeds,craters, blisters, and other irregularities (see 4.4.1). No orange peel (wavy appearance) shall beevident when viewed from at least six feet away.

3.7.2 Drying time. The admixed primer coating shall be tack free within 5 hours and shalldry hard within 8 hours (see table II).

3.7.3 Lifting. There shall be no evidence of lifting or any other film irregularity aftertopcoating the admixed primer coating that has air dried for 5 hours (see 4.5.3).

3.7.4 Adhesion. The primer coating shall not peel when tested in accordance with 4.5.4.3.7.5 Flexibility. The primer coating shall exhibit an elongation of not less than 10 percentwhen tested in accordance with 4.5.5.

3.7.6 Infrared reflectance (type II primer coating only). The total reflectance (specular anddiffuse) of the type II primer coating, relative to barium sulfate, shall be not greater than tenpercent throughout the range of 700 to 2,600 nanometers (nm) (see 4.5.6).

3.8 Resistance properties.3.8.1 Water resistance. The topcoated primer coating shall withstand immersion in distilledwater maintained at 49 ±3 °C (120 ±5 °F) for four days without exhibiting any evidence ofwrinkling, blistering, or any other coating deficiency (see 4.5.7).

3.8.2 Corrosion resistance.3.8.2.1 Salt spray. The primer coating, with and without a topcoat, shall not exhibit6

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blistering, lifting of either coating, nor substrate pitting after exposure to a 5 percent salt spray for2,000 hours. Class C primer shall exhibit no corrosion in the scribe (see 4.5.8.1).

3.8.2.2 Filiform. The topcoated primer coating shall not exhibit filiform corrosion extendingbeyond 6.35 millimeters (mm) (0.25 inch) from the scribe, and the majority of the filaments shallbe less than 3.175 mm (0.125 inch) in length (see 4.5.8.2).

3.8.3 Solvent resistance (cure). The primer coating shall withstand 50 passes (25 back andforth rubs) by a cloth rag soaked in methyl ethyl ketone (MEK). Rubbing through to baresubstrate constitutes failure of the primer coating to properly cure (see 4.5.9).

3.8.4 Fluid resistance. The primer coating shall withstand immersion for 24 hours in each ofsynthetic lubricating oil conforming to MIL-PRF-23699 and synthetic hydraulic fluid conformingto MIL-PRF-83282. Four hours after removal from the respective fluid, the coating shall notexhibit any softening, blistering, loss of adhesion, nor any other coating deficiency. Discolorationof the coating is acceptable and shall not be cause for rejection (see 4.5.10).

3.9 Working properties.3.9.1 Mixing and dilution. The components of the primer coating, including thinner ifrequired (see 6.11), shall homogeneously blend when mixed by a mechanical mixer in the volumemixing ratio specified by the manufacturer. Within one hour of mixing, the admixed coating shallnot separate into visually distinct layers (see 4.5.11.1).

3.9.2 Application. The admixed primer coating shall be capable of being applied byconventional, airless, high volume, low pressure (HVLP), or electrostatic spray equipment.Application shall yield a uniform film with no runs or sags at a dry-film thickness of15 to 23 microns (µm) (0.6 to 0.9 mil) (see 4.5.11.2).

3.10 Identification of material. Individual containers greater than one pint and cases ofcontainers less than one pint shall be identified with the following information:MIL-PRF-23377H, “Primer Coatings: Epoxy, High Solids” type I or II, class C or NComponent identification (as applicable):

Component A - base component or Component B - curing agentManufacturer’s name and product numberDate of manufacture (month/year)Batch number/net contentsVOC content in grams/liter

Mixing and thinning instructions

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3.10.1 Component containers. Component A and component B containers shall have thefollowing warning:

“WARNING! FLAMMABLE.”

3.11 Precaution sheet. A printed precaution sheet with the following information shall beincluded with each kit:

PRECAUTIONS

a. The surface to be coated must be clean (free of oil, dust, etc.).

b. Spray equipment must be adequately grounded. Clean equipment immediately after usewith thinner conforming to MIL-T-81772, type II.

c. Mix only the amount of primer coating to be used within 4 hours.

d. Always add component B to component A – NEVER THE REVERSE.

e. Never mix coating or individual component from one vendor with that of another vendor.f. Apply over pretreated metal. On fiberglass-reinforced plastic, a prior coating of washprimer in accordance with MIL-C-8514 will facilitate stripping without damage to thefiberglass.4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classifiedas follows:

a. Qualification inspection (see 4.2).b. Conformance inspection (see 4.3).

4.2 Qualification inspection. Qualification inspection shall consist of all the inspections listedin this specification. The qualification inspection performed by the qualification laboratory (see6.3) shall consist of a review for approval of the submitted manufacturer’s test report and

subjecting the qualification test sample to examination and testing to determine conformance to allrequirements in section 3. The qualification test sample shall consist of not less than one quart ofeach component of the primer coating. The samples shall be legibly identified (see 6.3.1.1).

4.3 Conformance inspection.4.3.1 Primer coating inspection. The conformance inspection shall consist of all the testsspecified in 4.5, with the exception of storage stability (see 3.5.3), accelerated storage stability(see 3.5.4), and corrosion resistance (see 3.8.2.1 and 3.8.2.2). There shall be no failures (see 6.5).Samples for tests shall consist of one complete unopened kit selected at random from each batch.Containers shall only be opened when being tested.

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4.3.2 Visual inspection of filled containers. Samples shall be selected at random from eachlot (see 6.6) in accordance with ASQC-Z1.4, inspection level S-2. The lot size for this inspectionshall be the number of kits fully prepared for delivery. The selected samples shall be examined forcontainer fill, proper location, and completion of item identification (see 3.10), warning

statements (see 3.10.1), and the precaution sheet (see 3.11). There shall be no defects (see 6.5).4.4 Test panels. Test panels shall be prepared under laboratory conditions (see 4.5). Testpanels shall be constructed of aluminum alloy. Alloy composition and pretreatments of test panelsshall be in accordance with table I. Unless otherwise specified in the test method, the primercoating shall be applied in accordance with 4.4.1 and the topcoat, when required, shall be appliedin accordance with 4.4.2.

4.4.1 Application of primer coating. When required by the test method, the primer coatingshall be prepared and applied as follows:

a. Thoroughly mixing each component separately.

b. Slowly pouring component B into component A while stirring the mixture to achievethe manufacturer's specified volume mixing ratio.

c. Diluting the admixed primer coating, if necessary, with thinner conforming toMIL-T-81772, type II. If dilution of the primer coating is required, do not exceed340 g/L (2.8 lb/gal) (see 6.11).

d. Allowing admixed coating to stand undisturbed for 30 minutes prior to use, unless themanufacturer’s directions state otherwise.

e. Spraying the test panels with primer coating to a dry-film thickness of 15 to 23 µm (0.6to 0.9 mil).If a topcoat is not used, the primer coating shall be allowed to air dry for not less than 14 days, orair dry for not less than one hour followed by 24 hours at 65.5 ±3 °C (150 ±5 °F) prior to testing.If a topcoat is required, the primer coating shall be air-dried for 5 hours and then coated with apolyurethane coating conforming to MIL-PRF-85285 in accordance with 4.4.2.

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MIL-PRF-23377HTABLE I. Aluminum test panels.PanelABCD

Substrate

SAE-AMS-QQ-A-250/4 (T3 temper)SAE-AMS-QQ-A-250/4 (0 temper)SAE-AMS-QQ-A-250/5 (T3 temper)SAE-AMS-QQ-A-250/5 (T3 temper)

Pretreatment

MIL-C-5541, class 1A (conversion coating)MIL-A-8625, type I or IC (anodize)Deoxidized 1/MIL-C-5541, class 1A (conversion coating)

1/Immerse test panel for 2 minutes in corrosion removing compound conforming to

SAE-AMS10, then remove test panel and rinse with distilled water. Apply the primercoating within one hour.4.4.2 Application of topcoat. When a topcoat is required by the test method, mixpolyurethane coating conforming to MIL-PRF-85285 (untinted gloss white conforming to

FED-STD-595, color number 17925) adding thinner, if required, and allow it to stand 30 minutesprior to application. Apply the coating to a total dry-film thickness of 43 to 58 µm

(1.7 to 2.3 mils). If applied in two coats, allow the first coat to air dry for 60 minutes prior toapplication of the second coat. After application of the topcoat to the required thickness andprior to testing, allow the coating to air dry for not less than 14 days or allow the coating to airdry for one hour followed by 24 hours at 65.5 ±3 °C (150 ±5 °F).

4.5 Test methods. The tests of this specification shall be conducted in accordance withtable II and 4.5.1 through 4.5.11. Unless otherwise specified in the test method or paragraph,laboratory test conditions shall be in accordance with ASTM-D3924. Room temperatureconditions are 18 to 29.5 °C (65 to 85 °F) and a relative humidity of 50 ±10 percent.

4.5.1 Condition in container. Each component in its unopened container shall stand withoutagitation for not less than 14 days at room temperature (see 4.5). After this period, the containersshall be examined for bulging or other deformation due to internal pressure. Each componentcontainer shall be opened and examined, then mixed by hand vigorously stirring with a paddle fornot more than 5 minutes, and examined for conformance to 3.5.2.

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TABLE II. Test methods.Test

Lead and cadmium contentChlorinated solvent content

Chromium content (class N only)VOC solvent contentFineness of grindCondition in containerStorage stability 1/Accelerated storage stability 2/OdorViscosityPot life

Surface appearanceDrying time 3/LiftingAdhesionFlexibility

Infrared reflectance (type II only)Water resistance

Salt-spray corrosion resistanceFiliform corrosion resistanceSolvent resistance (cure)Fluid resistanceMixing and dilutionApplication

RequirementParagraph3.43.43.4.1.23.4.23.5.13.5.23.5.33.5.43.6.23.6.33.6.43.7.13.7.23.7.33.7.43.7.53.7.63.8.13.8.2.13.8.2.23.8.33.8.43.9.13.9.2

TestParagraph

------------4.5.1---4.5.2---------4.4.1---4.5.34.5.44.5.54.5..5.74.5.8.14.5.8.24.5.94.5.104.5.11.14.5.11.2

FED-STD-141Test Method

---------------3022------------------------------------------------ASTM TestMethodASTM-D3335ASTM-D3742ASTM-D3718ASTM-D3960ASTM-D1210

------ASTM-D1849ASTM-D1296ASTM-D1200ASTM-D1200ASTM-D10

---------------------------------

1/The daily ambient air temperature at the storage location shall be within the range of 1.7 to46 °C (35 to 115 °F).

2/The primer coating shall be mixed with a mechanical shaker for 10 minutes instead of 300 stirsin 2 minutes.

3/ Use panels designated A in table I.11

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4.5.2 Accelerated storage stability. Not less than one full, unopened, sealed container ofeach component shall be stored undisturbed for not less than 14 consecutive days in a locationmaintained at 60 ±3 °C (140 ±5 °F). At the end of 14 days, the container(s) shall be allowed tocool to room temperature (see 4.5). (During the storage period, it is advised that the unopenedcontainers be placed in larger, vented containers to confine any splash that may occur if the lid ofthe unopened container is blown off by gassing.) If, upon removal, the unopened container isdeformed, do not open. If the container is not deformed, open carefully and examine its contentsfor conformance to 3.5.4.

4.5.3 Lifting. The primer coating shall be applied to test panels designated A (see table I) inaccordance with 4.4.1. Panels shall air dry for 5 hours and then be topcoated in accordance with4.4.2. Examine for conformance to 3.7.3 during and after the drying of the topcoat.

4.5.4 Adhesion. The primer coating shall be applied to test panels designated C (see table I)in accordance with 4.4.1. The test panels shall be immersed in distilled water for not less than 24hours at room temperature (see 4.5). After removal, the panels shall be dried with absorbentpaper tissue and within 3 minutes after removal from the water, be tested in accordance withFED-STD-141, Method 6301, for conformance to 3.7.4.

4.5.5 Flexibility. The primer coating shall be applied to test panels designated B (seetable I) in accordance with 4.4.1. The flexibility of the coating shall then be tested at the roomtemperature and relative humidity conditions as specified in 4.5, using a Gardco GE UniversalImpact Tester, Model #172 (see 6.8), using a specialized impacter that weighs 3.6 lb and hasformed four convex spherical segments on each end, each of different radii and extension. Placethe coated panel, film side downward, on the rubber pad at the bottom of the impacter guide.Drop the impacter on the panel through the impacter guide, ensuring that the impression of theentire rim of the impacter is made in the panel. Reverse the impacter ends and drop it through theguide on the panel adjacent to the first area of impact. Using 10 power magnification, examinefor conformance to 3.7.5; record the percent elongation corresponding to the largest sphericalimpression at which no cracking occurs.

4.5.6 Infrared reflectance (type II primer coating only). The type II primer coating shall beapplied to test panels designated A (see table I) in accordance with 4.4.1. The total reflectance(specular and diffuse) of the primer coating relative to barium sulfate shall be measured using anear infrared spectrophotometer over a range of 700 to 2,600 nm. Examine for conformance to3.7.7.

4.5.7 Water resistance. The primer coating shall be applied to test panels designated A (seetable I) in accordance with 4.4.1 and topcoated in accordance with 4.4.2. The coated test panelsshall then be completely immersed in distilled water maintained at 49 ±3 °C (120 ±5 °F) for fourdays. Two hours after removal from the water, the coating shall be examined for conformance to3.8.1.

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4.5.8 Corrosion resistance.4.5.8.1 Salt spray. Test panels designated A (see table I) shall be prepared with primercoating (see 4.4.1). One half of the primer coated panels shall be topcoated (see 4.4.2). Twointersecting lines shall be scribed diagonally across the coated surface of each panel, exposing thebare substrate. The test panels shall then be placed in a 5 percent salt-spray cabinet for 2,000hours in accordance with ASTM-B117. After removal, the test panels shall be examined forconformance to 3.8.2.1.

4.5.8.2 Filiform. The primer coating shall be applied to test panels designated D (seetable I) in accordance with 4.4.1 and topcoated in accordance with 4.4.2. Two intersectinglines shall be scribed diagonally across the coated surface of the test panels, exposing thebare substrate. The test panels shall then be placed vertically in a desiccator containing 12Normal (N) HCl for 1 hour at room temperature (see 4.5). Within 5 minutes of removal fromthe desiccator, the test panels shall be placed in a humidity cabinet maintained at

40 ±2 °C (104 ±3 °F) and relative humidity of 80 ±5 percent for 1,000 hours. The test panelsshall then be examined for conformance to 3.8.2.2. Filiform corrosion appears as threadlikefilaments initiating from the exposed substrate and spreading underneath the coating film. (Adescription of filiform growth in described in ASTM-D2803.)

4.5.9 Solvent resistance (cure). The primer coating shall be applied to test panelsdesignated A (see table I) in accordance with 4.4.1. The primer coating shall then be examinedfor cure, as follows:a.b.c.

Soak a cotton terry cloth rag in MEK solvent (see 6.10).

Rub the coating with the soaked rag for 50 passes (25 back and forth rubs) with firm fingerpressure.

Examine coating for conformance to 3.8.3.

4.5.10 Fluid resistance. The primer coating shall be applied to test panels designated A (seetable I) in accordance with 4.4.1. The test panels shall then be separately immersed to half theirlength for 24 hours in glass covered beakers containing the following liquids:a.b.

Lubricating oil conforming to MIL-PRF-23699, maintained at 121 ±3 °C(250 ±5 °F);

Hydraulic fluid conforming to MIL-PRF-83282, maintained at 65.5 ±3 °C(150 ±5 °F).

After removal from the test fluids, cool the test panels to room temperature (see 4.5) and examinefor conformance to 3.8.4.

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4.5.11 Working properties.4.5.11.1 Mixing and dilution. Thoroughly mix each component separately. Slowly pourcomponent B into component A, while constantly stirring, until the manufacturer's specifiedvolume mixing ratio is achieved. If necessary, dilute the admixed primer coating with thinnerconforming to MIL-T-81772, type II (see 6.11). Stir well and allow coating to dwell for 30minutes. Examine for conformance to 3.9.1.

4.5.11.2 Application. Using conventional, airless, high volume, low pressure (HVLP), orelectrostatic spray equipment, apply the primer coating to test panels to a dry film thickness of15 to 23 µm (0.6 to 0.9 mil) in accordance with 4.4.1. Examine for conformance to 3.7.1 and3.9.2.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified inthe contract or order (see 6.2). When actual packaging of materiel is to be performed by DoDpersonnel, these personnel need to contact the responsible packaging activity to ascertain requisitepackaging requirements. Packaging requirements are maintained by the Inventory Control Point’spackaging activity within the Military Department or Defense Agency, or within the Military

Department’s System Command. Packaging data retrieval is available from the managing MilitaryDepartment’s or Defense Agency’s automated packaging files, CD-ROM products, or bycontacting the responsible packaging activity.6. NOTES

(This section contains information of a general or explanatory nature which may be helpful,but is not mandatory.)

6.1 Intended use. The materials covered by this specification are low VOC, corrosion-inhibitive, chemical resistant, and strippable primer coatings. These primer coatings areformulated for the unique performance requirements of military aircraft. These requirementsinclude adhesion to a wide variety of metals and composites, flexibility to withstand tacticalmaneuvers at low temperatures, corrosion resistance in a marine environment, resistance to

leaking aircraft fluids, and low-infrared reflectance for stealth in combat. Type I is for general use.Type II is for use where low infrared reflectance is required. Unless a specific type or class isreferenced in a contract or purchase order, type I, class C is the default reference. The non-chromated (class N) primer coatings are for use where federal, state, or local regulations restrictthe use of chromate based materials. Class N primer coatings may only be used when

authorization for their use is given by the engineering authority for the system or item to whichthe primer coatings are to be applied. For users of MIL-PRF-23377F, class 2, high-solidscoating, use class C of this document.

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MIL-PRF-23377H

6.1.1 Compatibility. For some applications, and only when authorized by the procuringactivity, MIL-PRF-85582, Primer Coatings: Epoxy, Waterborne, may be substituted for

MIL-PRF-23377. Both MIL-PRF-23377 and MIL-PRF-85582 are compatible with the followingcoatings: TT-P-2756, Polyurethane Coating: Self-Priming Topcoat, Low Volatile OrganicCompounds (VOC); MIL-PRF-22750, Coating, Epoxy, High-Solids; MIL-C-46168, Coating,Aliphatic Polyurethane, Chemical Agent Resistant; and, MIL-C-53039, Coating, AliphaticPolyurethane, Single Component; MIL-PRF-85285 Coating: Polyurethane, High Solids.

6.2 Acquisition requirements. Acquisition documents must specify the following:a. Title, number, and date of the specification.b. Type and class required (see 1.2)

c. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue ofindividual documents referenced (see 2.2 and 2.3).d. Packaging requirements (see 5.1)

e. Quantity and kit size identification (see 6.7.1)

6.3 Qualification. With respect to products requiring qualification, awards will be made onlyfor products which are, at the time of award of contract, qualified for inclusion in Qualified

Products List QPL-23377, whether or not such products have actually been so listed by that date.The attention of the contractors is called to these requirements, and manufacturers are urged toarrange to have the products that they propose to offer to the Federal Government tested forqualification in order that they may be eligible to be awarded contracts or purchase orders for theproducts covered by this specification. Information pertaining to qualification of products may beobtained from the Commander, Naval Air Warfare Center Aircraft Division, Code 4.3.4.1,Building 2188, Patuxent River, MD 20670-1908.

6.3.1 Inspection report and other information. When authorizing the forwarding ofqualification samples, the qualifying activity will request the manufacturer to submit thequalification inspection sample, the Material Safety Data Sheet (MSDS) (see 6.9), and a testreport (see 4.2) showing that the material conforms to the requirements of this specification.6.3.1.1 Qualification inspection sample identification. Qualification inspection samples areto be forwarded to the laboratory designated in the letter of authorization (see 6.3) and identifiedas follows:

Qualification test samples.

Specification MIL-PRF-23377H, type I or II, class C or N (as applicable) Primer Coatings: Epoxy, High-Solids Manufacturer's name and product number

Submitted by (name and date) for qualification testing in accordance with authorization(reference authorizing letter)

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MIL-PRF-23377H

6.4 Retention of qualification. To retain qualification approval of products listed on theQualified Products List (QPL), the manufacturer will be required to verify by certification to thequalifying activity that its product(s) comply with the requirements of this specification. Unlessotherwise specified by the qualifying activity, the time of periodic verification by certification willbe in two-year intervals from the date of original qualification. The certification action will beinitiated by the qualifying activity.

6.5 Conformance rejection and retest. Failure in any conformance inspection will result inthe rejection of the batch from which it was obtained and constitutes justification for removalfrom the qualified products list. Rejected material cannot be resubmitted for acceptance withoutwritten approval from the qualification activity (see 6.3). The application for resubmission willcontain all details concerning previous rejections and measures taken to correct these deficiencies.6.6 Lot and batch formation. A lot shall consist of all of the primer coatings manufacturedat one time from one batch, forming part of one contract or purchase order and submitted foracceptance. A batch shall consist of all primer coatings manufactured during one continuousoperation.

6.7 Part or Identifying Number (PIN). The PIN to be used for primer coatings acquired tothis specification is created as follows:

M23377Specificationidentifier

-X

Type designator1 = Type I2 = Type II

-X

Class designator

(C or N)

-XXXX

Kit size designator

(see 6.7.1)

6.7.1 Kit size. The primer coatings covered by this specification should be purchased byvolume, the unit being a kit containing two components. The kit component sizes need not be ofthe same size. When this part numbering system is used, the kit size is to be identified as:

Kit Size 1/Less than one pint4-pint (0.47-liter)4-quart (0.95-liter)4-gallon (3.79-liter)20-gallon (75.7-liter)

Kit Size Designator

2/004P004Q004G020G

1/The kit size and its designator may be modified for ease of procurement and is not limited.2/Designators for less than pint size kits (small touch-up kits) shall be expressed in cubic

centimeters (cc) and shall be designated by “C.” Example: A type I, class C, 50 cc kit shallbe designated M23377-1-C-050C.

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6.8 Impact tester source. An instrument for conducting the flexibility (see 4.5.5) is theGardco GE Universal Impact Tester, Model #172, available from the Paul N. Gardner Company,316 NE First Street, PO Box 10688, Pompano Beach, FL 33061-6688. There may be otherinstruments equivalent to this unit.

6.9 Material Safety Data Sheet (MSDS). An MSDS must be prepared and submitted inaccordance with FED-STD-313. The MSDS must also meet the requirements of

29 CFR 1910.1200. The 29 CFR 1910.1200 requires that the MSDS for each hazardous

chemical used in an operation must be readily available to personnel using the material. Questionspertinent to the effect(s) of these coatings on the health of personnel using them shall be referredby the procuring activity to the appropriate medical service, who will act as its adviser.Contracting officers will identify the activities requiring copies of the MSDS.

6.10 Safely handling MEK solvent. To minimize exposure to MEK solvent, it isrecommended that personnel conducting the solvent resistance (cure) test (see 4.5.9) wear, as aminimum, either butyl rubber or Teflon gloves and a National Institute of Occupational Safety andHealth (NIOSH) approved half-face respirator equipped with organic vapor cartridges andgoggles or a full-face respirator equipped with organic vapor cartridges.

6.11 Thinning. If it is necessary to add thinner to this coating, use only thinner conformingto MIL-T-81772, type II. In areas where air quality regulations restrict volatile emissions, do notadd thinner to the primer coating if that addition will raise the VOC content to greater than340 g/L (2.8 lb/gal).

6.12 Subject term (key word) listing.Chemical resistanceCorrosion inhibitiveFlammable

Hydrochloric acid (HCl)Low infrared reflectanceMethyl ethyl ketone (MEK)Strontium chromate

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6.13 Changes from previous issue. Marginal notations are not used in this revision toidentify changes with respect to the previous issue due to the extent of the changes.

Custodians: Army - MR Navy - AS Air Force - 99

Review activities:

Army - AR, AV, EA, MI Navy - CG, MC, OS, SH Air Force - 11, 84

Other - DS, GSA/FSS (9FTE-10)

Preparing activity: Navy - AS

(Project 8010-0175)

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STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL

INSTRUCTIONS

1. The preparing activity must complete blocks 1, 2, 3, and 8. In block 1, both the document number and revision letter should be given.

2. The submitter of this form must complete blocks 4, 5, 6, and 7, and send to preparing activity. 3. The preparing activity must provide a reply within 30 days from receipt of the form.

NOTE: This form may not be used to request copies of documents, nor to request waivers, or clarification of

requirements on current contracts. Comments submitted on this form do not constitute or imply authorization to waive any portion of the referenced document(s) or to amend contractual requirements.

I RECOMMEND ACHANGE:

1. DOCUMENT NUMBER

MIL-PRF-23377H

2. DOCUMENT DATE (YYYYMMDD)

20020430

3. DOCUMENT TITLE

PRIMER COATINGS: EPOXY, HIGH-SOLIDS

4. NATURE OF CHANGE (Identify paragraph number and include proposed rewrite, if possible. Attach extra sheets as needed.)

5. REASON FOR RECOMMENDATION

6. SUBMITTER

a. NAME (Last, First, Middle Initial)c. ADDRESS (Include ZIP Code)

b. ORGANIZATION

d. TELEPHONE (Include Area Code)(1) Commercial(2) DSN

(If applicable)

7. DATE SUBMITTED (YYYYMMDD)

8. PREPARING ACTIVITYa. NAME

COMMANDER

NAVAL AIR WARFARE CENTER AIRCRAFT DIVISIONc. ADDRESS (Include ZIP Code) CODE 414100B120-3 HIGHWAY 547

LAKEHURST, NJ 08733-5100

b. TELEPHONE (Include Area Code)(1) Commercial (732) 323-2947

(2) DSN624-2947

IF YOU DO NOT RECEIVE A REPLY WITHIN 45 DAYS, CONTACT: Defense Standardization Program Office (DLSC-LM) 8725 John J. Kingman Road, Suite 2533 Fort Belvoir, Virginia 22060-6221

Telephone (703) 767-6888 DSN 427-6888

WHS/DIOR, Feb 99

DD Form 1426, FEB 1999 (EG) PREVIOUS EDITION IS OBSOLETE.