P-W-2891A
4.5 Test methods. All tests performed for this specification shall be conducted in accordance with table I, table II, and 4.5.1 through 4.5.6.2.4. Unless otherwise stated in the test method, room temperature shall be 70 ±10 °F (21 ±5 °C) and relative humidity shall be 50 ±10 percent.
4.5.1 voC content. The voC content of type I wipe solvent shall be determined from the composition, specific gravity, and the following equation:
voC content (g/l) = Specific gravity x 998.23 x (1- weight fraction exempt solvent)
where exempt solvents are those listed in 40 CFR 51.100. Each component of type II wipe solvent shall be verified as exempt by identifying its listing in 40 CFR 51.100.
4.5.2 Flammability (class D only). Flammability shall be determined in accordance with
NFPA 704.
4.5.3 Immersion corrosion. The immersion corrosion test shall be conducted in accordance with ASTM-F483 on test panels constructed of the following materials:
a. Aluminum alloy 2024 (T3 temper), conforming to SAE-AMS-QQ-A-250/4 b. Aluminum alloy 7075 (T6 temper), conforming to SAE-AMS-QQ-A-250/12 c. Titanium alloy (6AL-4v), conforming to SAE-AMS4911
d. Carbon steel (1020), conforming to SAE-AMS5040
e. Cadmium plating applied to (d), in accordance with ASTM-F1111 f. Magnesium alloy (AZ31B-H24), conforming to SAE-AMS4377
4.5.4 Hydrogen embrittlement.
4.5.4.1 Specimens. Hydrogen embrittlement characteristics shall be determined in accordance with ASTM-F519, using cadmium-plated AISI 4340, type 1a specimens. Plating shall be applied using treatment B without conversion coating and shall cover the notch and surfaces within 0.5 inch (13 mm) of the notch; threaded surfaces shall not be plated. Plated specimens shall be baked in accordance with ASTM-F519.
4.5.4.2 Procedure. Four specimens shall be tested as follows. Stress the specimen by applying a load equivalent to 75 percent of notch fracture strength. Apply the solvent by brushing onto the notch area every 30 minutes for the first eight hours. Failure is as specified in table I. Alternatively (for step load testing), a load equivalent to 45 percent of notch fracture
strength shall be applied for the first 24 hours. Apply the solvent by brushing onto the notch area every 30 minutes for the first eight hours. After the first 24 hours, step the load up an additional
5 percent each hour until failure. Failure is as specified in table I.
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