1、/ MIL-A-3850 68 U 7797706 OLLLI422 7 l!kIrA-3850 24 DECEMBER 1952 SUPERSEDING PXS-1281 3 AUGUST 1948 MILITARY SFECIFICATION . ACETYLENE BLACK Tht specification hau Laen approved by tb Depart- munts of the Amy, tk Naoy, and the Air Fwce. 1.- SCOPE 3. REQUIREMENTS. 1.1 This specification covers one .g
2、rade of acetylene black. 2. APPLICABLE SPECIFICATIONS, STANDARDS, DRAWINGS, AND PUBLI- CATIONS 2.1 The following specifications and stand- ard, of the issue in effect on date of invita- tion for bids,:form a part of this specification: SPECIFICATIONS FEDERAL ing. RRS-366 -Sieves ; Standard, Test- MI
3、LITARY, MIGG;2650 -General Specification for Ammu-nition Except Small Arms Am- munition. NAVY DEPARTMENT Material. General Specifications for Inspection of STANDARDS MILITARY MIE-STD-129-Marking of Shipments. (Copies of specifications, standards, and drawings required by contractors in connection wi
4、th specific procurement -functions should be obtained from the procuring agency or as directed by the contracting officer.) 3.1 Material.-The acetylene black shall be manufactured by the incomplete combustion of acetylene by any suitable method which will produce material conforming to the re- quire
5、ments of this specification. 3.2 Chemical and physical requirements.- The acetylene black shall conform to the chemical and physical requirements shown in table I, when tested in accordance with the applicable test method specified in sec- tion 4. TABLE I.-Chemical and phpsical requiye- ments of the
6、 acetylene black. Test Require- method Property ment paragraph - Moisture content, percent, Sulfur content, percent, Ether-extractable matter, Volatile matter, percent, Water-soluble matter, per- maximum _-_ 0.50 4.4.1 maximum _ 0.06 4.4.2 percent, maximum _ 0.60 4.4.3 4.4.4 maximum _ 2.0 cent, maxi
7、mum _ 0.10 4,4.6 4.4.6 pH of water extract 6.Q f 1.0 4.4.7 Apparent density, g/cc, ,_-_0.08 * 0.03 4.4.8 Coarse particles : Ash, percent, maximum. _ 0.10 . 4.4.9 4.4.10 I Retained on No. 325 sieve? percent, maxi- mum _-_ kO.10 Grit, percent, maximum _ 0.05 i 1 The sieve shall conform ,$o Ybecificati
8、on RR-S- 366. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BIIL-A-3850 3.3 Workmanship.-The acetylene black shall be processed in accordance with high grade commercial practices for the manufac- ture of thi
9、s type of material. 4, SAMPLING, INSPECTION, AND TEST PROCEDURES. 4.1 Lot.-A lot shall consist of 1000 pounds maximum. 4.2 Sampling.-Ten percent of the contain- ers comprised in a lot, but in no case more than XQ or less than 3 containers shall be selected by the inspector so as to be repre- sentati
10、ve of the lot. If there are less than 4 containers in the lot, all the containers shall be sampled. The material in each selected container shall be mixed to a uniform con- sistency throughout, and approximately 8 ounces shall be removed from each container. Each of these primary samples shall be pl
11、aced in an airtight container and labeled so that the container from which it was taken can be identified, A composite sample of approxi- mately 8 ounces shall be made from equal portions of the primary samples. The com- posite sample shall be thoroughly mixed and placed in an airtight container lab
12、eled to show the name of the material, manufacturer, plans, contract or order number, lot number, and lot size, Ail acceptance tests shall be made on the composite sample. However, if it becomes apparent during sampling that the lot is not uniform, the inspector may require that any primary sample b
13、e tested for com- pliance with the requirements of this specifi- cation. AI1 primary samples shall be held for possible future examination should the com- posite sample fail to meet the requirements, 4.3 Inspection 4.3.1 Am?j.-Inspection shall be made in accordarice with Specification MILG-2550, and
14、 shall be at the point of delivery unless otherwise specified. 4.3.2 Nav;tl.-Th.e general inspection pro- cedures shall be in accordance with General Specifications for Inspection of Material, ?!i?- “ 4.4 Tests. 4.4.1 Moisture. - Transfer an accurately weighed portion of approximately 2 grams of the
15、 sample to a tared, wide-mouth, short weighing bottle fitted with a glass stopper. Heat, with stopper removed, for 2 hours at 105 f 2“ C. Insert stopper, cool in a desicca- tor and weigh. Repeat the heating at 106 -t- 2“ C. until constant weight is attained. Cal- culate the loss in weight of the sam
16、ple as percent moisture. 4.4.2 Sulfui*. - Transfer an accurately weighed portion of approximately 0.5 gram of the sample to the cup of a Parr sulfur bomb. Add approximately 1 gram of potas- sium perchlorate, and mix thoroughly with a glass rod. Add approximateiy 15 grams of sodium peroxide, cover th
17、e cup, and mix by shaking. Assemble and tighten the bomb, and place it in the holder within a shield. Ignite the contents of the bomb either electrically or by directing the flame of an oxy-gas burner against the bottom of the cup. After the ini- tial ignition continue the heating until the lower ha
18、lf of the cup attains an even cherry- red color. Remove the bomb from the shield, allow it to stand at room temperature for ap- proximately 5 minutes, and then cool it in water, Remove the outer fastenings of the bomb without disturbing the cap, wash the exterior of the cap and the cup with water, a
19、nd discard the washings. Remove the bomb cap, place the cup on its side in a 260-ml. beaker, and wash the material adhering to the underside of the bomb cap into the beaker with a stream of water fram a wash bottle. Cover the beaker with a watch glass, and cautiously add 100 ml. of hot distilled wat
20、er. W in distilled water, and diluting to 1 liter. 6.7.2.3 Solzction C.-Preps?: a 0.05 molar succinic acid solution by dissolving ,9 grams of succinic acid (which has been purified by recrystallizing twice from distilled water ani dried to constant weight in a desiccator o-rer calcium chloride), in
21、distilled water, and dilut- ing to 1 liter. 6.7.3 Preparation of the Buff er solutions.- Prepare buffer solutions of the indicated pH at 25“ C. by mixing the stock solutions in the following pruiortions : pH of bil.fler SOhtiOR A n C Stock sohition ml. 4.0 - 1.78 8.22 5.0 - 3.68 622 6.0 8.77 1.23 -
22、7.0 6.23 3.77 - 8.0 4.66 5.35 - 9.0 1.76 8.26 -3 6.8 Triton 720, Darven No, I, and Nacconol have been found satisfactory disperriing agents for making the coarse partiples deter- mination (see 4.4.9). Notice.-When Government drawings, epeciflca- tions, or other data are uaed for any purpow other tha
23、n in connection with a deflnitely related Govenr- ment procurement operation, the United States Gor- srnment %hereby incurs no responsibility nor any obligation whatsoever; and the fact that ths Govcm- ment may have formulated, furnished, or in any way aupplied the said drawings, specifications, or
24、other data is not to be regarded by implication or otherwise ao in any manner licensing the holder or any other person or corporation, or conveying any rights or permisnion to manufacture, tw, or sail any patsntsd invention that may in any way be related thereto. Custodians: Arm y-Ordnance Corps Nav
25、y-Bureau of Ordnance Other Interest: Nav y-S. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-3850 b I -, - FIGURE 1.-Apparatus for determination of apparent density. -7 7 / - C I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
