A-A-52092A
2 milliliters of concentrated sulfuric acid. Heat at low temperature and then ignite gently to a constant weight. Calculate the percent residue as follows:
Percent residue on ignition = 100 R W
Where: R = weight of residue after ignition, in grams
W = weight of dried specimen used, in grams
3.4 Free acid test method. Dissolve 2 grams of the original specimen in 20 milliliters of water. Add one drop of methyl red indicator. Add one drop of 0.1 N sodium hydroxide. The yellow color shall remain.
3.5 Heavy metals test method. Dissolve 0.5 grams of the original specimen in 50 milliliters of water. Pass hydrogen sulfide gas through the solution and add l milliliter of ammonium hydroxide. No brown color shall develop. Disregard any green color present.
3.6 Sieve particle size graduation test method. The ammonium chloride shall meet the sieve particle size graduation requirement of table I when it is passed through a number 30 sieve in accordance with American Society Testing and Materials (ASTM) E 11, "Wire-Cloth Sieves for Testing Purposes."
4. PRODUCT CONFORMANCE PROVISIONS. The product provided shall meet the salient characteristics of this commercial item description, conform to the producer's own drawings, specifications, standards, and quality assurance practices. It shall be the same as that offered for sale in the commercial market. The Government reserves the right to require proof of such conformance.
5. PACKAGING. Preservation, packing, and marking shall be as specified in the purchase order or contract.
6. NOTES
6.1 Ordering data. Acquisition documents must specify the following:
a. Title, number, and date of this document. b. Type (see 2) and weight (table I).
c. Quantity required.
d. Packaging requirements.
6.2 Part or identification number (PIN). The following part or identification numbering procedure is for government purposes and does not constitute a requirement for the contractor.
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