A-A-2962A
Note 6. Hydrocarbon Resistance. Prepare three steel test coupons as described in Note 3 above. Apply sufficient test enamel to an unprimed steel test panel to result in a uniform 1.0 +/-0.2 mil dry film. Any method of application may be used provided the film is smooth and uniform after air drying for 7 days between 21-23oC and 50-60% relative humidity. Do not seal the edges of the enamel film. Immerse the panel for 4 hours in a mixture of 70% (wt. basis) ACS reagent grades, 2,2,4-trimethyl pentage (isooctane) and 30% toluene. The test is failed of more than one test panel shows even slight visual indication of wrinkling, loss of adhesion or loss of hardness. Hardness shall be a minimum of 90% of control panel hardness when tested in accordance with ASTM D 1474, Method A.
Note 7. Recoat. Using a 0.0030 inch gap film applicator, draw down a 2-inch wide film of test enamel on three clear glass panels. Permit the first to air-dry for 24 hours (dry-through) between 21-23oC and 50-60% relative humidity. Draw a 3-inch wide film of test enamel across the width of the first enamel film, using the same 0.0030 inch gap film applicator. After 24 hours at the same drying conditions, examine the enamel surfaces from the front and backside of the glass panels for compliance with the requirement. The enamel fails, if more than one panel fails the requirements measured against a control panel for adhesion (ASTM D 3359), hardness (ASTM D 1474), and visual surface wrinkling.
Document Sources.
Commercial Item Description may be obtained from the Federal Supply Service Bureau (3FBP-W), Suite 8100, 470 East L’Enfant Plaza, SW, Washington DC 20407.
ASTM standards are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Use the most current ASTM test method to determine compliance.
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