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MIL-C-11796B <br /> Federal Test Method Standard No. 791. the sample when it has cooled to room tem- <br /> perature. <br /> 4.4.2 Inspection of packaging. The con- ; <br /> tainers shall be inspected for fill, closure, evi- 4:6.3 Volatility. Weigh approximately 1.5 <br /> dente of leakage, and marking to determine grams of the compound in a tared aluminum <br /> compliance with Standard MIL–STD-290. dish having a diameter of approximately 21/2 <br /> inches. Determine the weight of the sample <br /> 4.5 Classification of tests. to the nearest milligram. Heat the dish and <br /> its contents for 3 hours in a mechanical <br /> 4.5.1 Qwalification tests. Qualification tests convection oven maintained at 2210 to 2300 <br /> shall consist of all ,the tests of this specifica- F. Remove the dish from the oven, cool in a <br /> tion. desiccator for at least 1/2 hour, and weigh to <br /> the nearest milligram. Calculate the loss in <br /> 4.5.2 Acceptance tests. Acceptance tests weight of the sample to percent volatile con- <br /> shall consist of all the tests of this specifica- tent of the compound. <br /> tion except the shed storage test (see <br /> 4.6.8.3), the outdoor storage test (see 4.6.4 Oxygen absorption (Class 3 only). <br /> (4.6.8.4), and the removability test following The oxygen absorption characteristics of the <br /> outdoor and shed storage (see 46.11). compound shall be determined in accordance <br /> with Method 3453 of Federal Test Method <br /> 4.6 Tests. <br /> Standard No. 791, except that brass cata- <br /> lysts, prepared as specified in 4.6.4.1, shall <br /> 4.6.1 Physical and chemical tests. The be used in making the determination. <br /> physical and chemical,tests shall be conducted <br /> in accordance with Federal Test Method 4.6.4.1 Preparation of brass catalysts. <br /> Standard No. 791 as follows: Prepare 5 discs, each 1 5/16 inches in di- <br /> ameter and 0.050 inch in thickness, using <br /> (a) Penetration ................ Method 312 brass plate conforming to composition E of <br /> (b) Flash point ................ Method 1103 Specification QQ–P-613. The discs shall be <br /> (c) Melting point ............ Method 1401 <br /> thoroughly washed in alkaline cleaning solu- <br /> tion (6 ounces of commercial <br /> (d) Sulfated residue ........ Method 5422 Fade sodium <br /> metasilicate per gallon of solution) and <br /> rinsed with cold running tap water. The disc <br /> 4.6.2 Stability. Melt approximately 15 shall then be immersed for 20 seconds in an <br /> grams of,the compound by heating at a lower etching solution having the following com- <br /> temperature than the maximum permissible position. <br /> temperature of application (see 3.10.1). 450ml. of distilled water. <br /> Pour the molten sample into a 25 by 150 mm 225 ml. of concentrated nitric acid, <br /> test tube and heat for 11/2 hours in an oven ACS <br /> maintained at 221° to -230° F. Observe the 300 ml. of concentrated sulfuric acid, <br /> sample for foaming during the first half- ACS. <br /> hour. Remove the sample from the oven, al- 8 ml, of concentrated hydrochloric <br /> low it to stand for one hour at 75±5° F.,and acid, AGS. <br /> follow up with cooling-for one hour at —40 <br /> ±3°F. At the end of the cooling period re- After being etched the discs shall be rinsed <br /> heat the sample for one hour at 221° to with cold running tap water and immersed <br /> 230° F. Remove the sample from the oven momentarily in a color dip solution having <br /> without tipping or shaking and examine for the following composition: <br /> separation into different phases. Re-examine 770 ml. of distilled water. <br /> 5 <br />