1、A-A-59139 W 90LB054 O004093 158 Impurity Silicon Iron Zinc Copper Grit Oil and grease Volatile matter at 105 “C Alkalinity as magnesium hydroxide I INCH-POUND I 25 September 1998 A-A-59139 COMMERCIAL ITEM DESCRIPTION Maximum Percent Allowable 0.3 0.5 0.05 o. 1 0.05 0.2 o. 1 0.07 ALUMINUM POWDER, ATO
2、MIZED (FOR USE IN EXPLOSIVES) Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Indian Head Division, Naval Surface Warfare Center, Standardization Team (Code 840M), 101 Strauss Avenue,
3、 Indian - Head, MD 20640-5035. The General Services Administration has authorized the use of this commercial item description as a replacement for Military specification MIL-A-82728(OS) for all federal agencies. 1. SCOPE. 1.1 This commercial item description covers one type of atomized aluminum powd
4、er for use in explosives. 2. SALIENT CHARACTERISTICS. 2.1 Material. The aluminum powder shall be microfine virgin aluminum particles manufactured by an atomizing process. The shape of the particles shall be spheroidal. 2.2 Aluminum purity. The aluminum purity shall be a minimum of 98.5 percent. 2.2.
5、1 Impurities. The impurities shall not exceed the maximum specified in Table I. TABLE I. Maximum allowable impurities. AMSC NIA FSC 6810 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
6、nse from IHS-,-,-A-A-59139 9038054 0004094 O94 r t A-A-59 139 2.3 Screen analysis. The material shal conform to the following requirements for the screen analysis: a. A minimum of 95.0 percent shall pass through a U.S. Standard 200 sieve b. A minimum of 80.0 percent shall pass through a U.S. Standar
7、d 325 sieve. 2.4 Average particle size. The average particle size of the material shall be 11 to 27 micrometers as determined by a Fisher subsieve sizer. 3. REGULATORY REQUIMENTS. 3.1 This standard does not purport to address ail of the safety problems, if any, associated with its use. It is the res
8、ponsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 4. QUALITY ASSURANCE PROVISIONS. 4.1 Product conformance. The product provided shall meet the salient characteristics of
9、this Commercial Item Description, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial market. The government reserves the right to require proof of such conformance. 4.2 Inspection requirements.
10、 Ten percent of each single batch or continuous production run (produced using a single set of operations and operating conditions) shall be randomly selected for acceptance tests. The sample shali be uniformly mixed and an 8-ounce composite sample selected for the tests of 4.3. 4.3 Testmethods. 4.3
11、.1 Percent ahimmum and eiemental impurities. Determine percent aluminum by difference and elemental impurities (silicon, iron, zinc, and copper) by chemical analysis in accordance with ASTM E 34, or by spectrochemical analysis in accordance with ASTM E 101. 4.3.2 Grit. Weigh to the nearest 0.01 gram
12、, 5.0 to 5.1 gram of aluxninum powder into a 400 mL beaker. Cover with approximately 10 mL of water. Cautiously and slowly, add 60 mL of concentraed hydrochloric =id. Cover with a ribbed watch glass, heat to effect solution of sample, cool, then transfer sufficient solution to a tared 50-mL centrifu
13、ge tube to balance a second centrifuge tube containing approximately 45-m of water. Cekfige the two centrifige tubes, m baiamxi position, at 600 to 700 relative centrifugal force (rcf, see 6.3) for 15 minutes. Allow he centrifuge to stop without braking and decant the liquid layer from the mpifuge t
14、ube containing the solution. Add the rest of the solution to the centrifuge tube. “Riase tile beaker with water and add the rinsing to the solution centrifuge tube. Add a sufficient quantity of rinsing water to the specimen tube to baiance it with the centrifuge tube containing water. Centrifuge, st
15、op, and decant as abve. Add sufficient water to balance the centrifuge tube, shake to mix, and centrifuge as above. Decant the liquid layer and dry the tared centrifuge tube to a constant weight in a drying oven at 105 f 2C. Cool in a desiccator and weigh to the nearest O. 1 mg. Calculate percent gr
16、it as follows: 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59139 = 9018054 OOOLiO5 T20 A-A-59139 1OO(A - B) Percent grit = W Where: A = Weight of centrifuge tube and dried contents in grams B = Tare weight of centrifuge tube in grams W = We
17、ight of specimen in grams. 4.3.3 Oil and grease. Determine the percent of easily extracted fatty and oily matter in accordance with the procedure for aluminum of ASTM D 480. 4.3.4 Volatile matter at 105C. Determine the percent of volatile matter in accordance with the procedure for aluminum paste of
18、 ASTM D 480, except that a 10 gram specimen shall be used. Weight Loss Weight of Sample Volatile matter at 105C (percent) = 4.3.5 Alkalinity. Weigh to the nearest milligram approximately 2 grams of test sample and transfer to a stoppered Erlenmeyer flask. Add 200 mL of cold water. Stopper and shake
19、the flask every 2 minutes. After 15 minutes, filter sample through a dry, neutral filter paper. Titrate 100 mL of filtrate with 0.05N sulfuric or hydrochloric acid using 5 drops of bromothymol blue as indicator. Run a blank determination. Calculate alkalinity as percent magnesium hydroxide as follow
20、s: 5.833N (A - B) W Percent alkaliniy = Where: A = Milliliters of acid required for sample titer B = Milliliters of acid required for blank titer N = Normality of acid W = Weight of sample in grams. 4.3.6 Particle size distribution. Determine the particle sizePistribution of aluminum powder in accor
21、dance with ASTM B 214 using ASTM Sieves and 50-gram samples. A weighed portion of approximately 50 gram of the sample shall be placed on the top sieve of the nest of sieves assembled as follows, top to bottom: 100, 200, 230, 325, and bottom pan. 4.3.7 Average particle size, The average particle size
22、 shall be determined by a Fisher subsieve sizer according to the manufacturers instructions. 5. PACKAGING. Preservation, packing, and marking shall be as specified in the contract or order. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I A-A-5913
23、9 901805rl 000Y07b 9b7 d A-A-59139 6. NOTES. 6.1 Intended use. The aluminum powder is intended for use in explosives. 6.2 Acquisition requirements. Acquisition documents must speci the following: (a) Title, number, and date of this commercial item description. (b) Packaging and packing requirements.
24、 6.3 Reiative centrifugal force(rcf). Relative centrifugal force is defined as follows: B2 ref = A x - 265 Where: A = B = Diameter of swing in inches measured between tips of opposite tubes when in rotating position. Speed of centrifuge in revolutions per minute. 6.4 Referenced documents. Applicatio
25、n for copies of ASTM standards should be addressed to the American Society for Testing and Materials Customer Service, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Preparing Activity: (Project 68 1O-NO97) Navy - OS U 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
