FED-STD-228A
3.2.5 Petroleum ether, boiling range 30° to 60°C (86° to 140°F).
3.2.6 Phenol.
3.2.7 Sodium hydroxide, 3 and 20 percent solutions.
3.2.8 Sodium nitrate, 0.5 N solution.
3.2.9 Solution No. 1 (p-dimethylamine benzaldehyde-hydroquinone mixture). One gram of p-
dimethylamine benzaldehyde and 0.01 gram of hydroquinone shall be dissolved in 100 ml. of absolute
methyl alcohol. Five ml. of hydrochloric acid, specific gravity 1.19, and 10 ml. of ethylene glycol shall be
added and the specific gravity adjusted to 0.851 at 25°/4°C by the addition of methyl alcohol or ethylene
glycol. The solution shall be stored in a dark brown bottle. The solution is stable for several months
when stored under such conditions.
3.2.10 Solution No. 2 (Metanil yellow). Two grams of sodium citrate (Na3C5H5O711H2O), 0.2 gram of
citric acid, 0.03 gram of Brom. Cresol green, and 0.03 gram of Metanil yellow shall be dissolved in 500 ml.
of distilled water.
3.2.11 Spot test paper (chloroprene-nitrile).
3.2.11.1 Benzidine hydrochloride-hydroquinone wetting solution. Two and one-half grams of benzidine
di-hydrochloride shall be dissolved in a mixture of 500 ml. of methyl alcohol and 500 ml. of water, and 10
ml. of 0.1 per cent aqueous solution of hydroquinone added. The solution shall be stored in a dark brown
bottle. If protected from light and air the solution remains stable for several months. A precipitate that
forms on standing does not affect the efficiency of the solution.
3.2.11.2 Test paper. Two grams of cupric acetate and 0.25 gram of Metanil yellow shall be dissolved in
500 ml. of methyl alcohol. Filter paper shall be impregnated with the solution, dried, and then cut into
strips to form test paper. To conduct the test this paper shall be moistened with the wetting solution in
3.2.11.1.
3.2.12 Spot tests paper (polyisobutylene).
3.2.12.1 Mercuric oxide-sulfuric acid wetting solution. Five grams of yellow mercuric oxide shall be
added to a mixture of 15 ml. of sulfuric acid, specific gravity 1.83, in 80 ml. of water, and the mixture
boiled until the mercuric oxide has dissolved. The solution shall be cooled and diluted to 100 ml. with
distilled water.
3.2.12.2 Test paper. Blank filter papers shall be moistened in the wetting solution described in 3.2.12.1
and then cut into strips.
3.2.13 Spot test paper (rubber-styrene).
3.2.13.1 Trichloroacetic acid-isopropanol wetting solution. Thirty grams of trichloroacetic acid shall be
dissolved in isopropanol and the solution diluted to 100 ml. with the same solvent. The solution should
not be allowed to come in direct contact with the skin.
216
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business