1、JAN-C-99 13 9999906 O290765 JAN-C-99 31 OCTOBER 1944 CEMENT, PETTMAN Army Number Navy Number 50-1 1-8C 52C34 JOINT ARMY-NAVY SPECIFICATION This specification was approved by the War Deportment and the Navr Department for use of procurement services of th! Army arid the Navr and supersedes the follow
2、ing apedficatioh . Xavy Department U. S. Army 50-114B 4 January 1943 A. APPLICABLE SPECIFICATIONS. _-_-_-_-_- A-1. The following specifications, of the issue in effect on the date of inrltatfon for bids, form a part of this specification: U. S. ARMY SPECIFICATIONS 5 General Specifications. (Methods
3、for Sampling FEDERAL SPECIFICATIONS and Testing.) !CT-S-251-Shellac, Orange: JJJ-T-121-Tar, Pine, Technical Grade. LLT.-R-B2G-Rosin. B. TYPES. B-l. This specificatiou covers two types of cemeut: Type A, Pettman C-l. ilfaterial.- Gia. Iron oziide.-The iron oxie shall be il ground iron oxide ore, not
4、less than 96.5 percent of which shall pass through a No. 325 (44 micron) U. S. Standnrd siwe. It shall contaln not less than 60 percent of ferric oxide. (Feroa), and the total of ferric oxide, insoluble slliceoos material, and loss on ignition shall be not less than 90 percent. Glb. Bthyl alcohol.-T
5、he alcohol used shall be either Grade 2 alcohol or a mixture of ethyl and methyl alcohols complyng with the requirements for Grade 4 alcohol except that It shall contain a maximum of 5 percent of methyl alcobol and no benzene. C-lc. EthuZ cethclose.-The ethyl cellulose used shall be a technical grad
6、e soluble in alcohol. Gld. BheZlac.-Type I, Grade D shellac shall be used. Type B, modified Pettmau cement. C. MATERIAL AND WORKMANSHIP. 1395 .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-JAN-C-79 13 - 7999906 0290766 T 9 t 2 C-2. Vorkman8hip.-
7、02a. Tvpe A cene?t.-Pctlni:iii cenient should be prepared by mix- lug the pine tar and nlcohol, adding the shellac, aiid stlrriiig well. After the mixture has been allowed ta stand for about 20 hours, it is stirred thoroughly and the iron oxide is added in small portions with continuous stirring. St
8、rriiig is corititiued until a prodiict of uniform consistency is obtiiiiied. G2b. Type B ceriifwt.-3iodified Petliiian ceiiient should he prepared by miririg the alcohol and i.tliyI cellulose until a clear solution is obtained, adding the iosiii and niisiiig until this is dispersed, adding the pine
9、tar with thorough stirring, und finally adding the iron oxide In small portions wih continuous slirring. Stirring is coiitiiiue until a product of uniform coiislstoriry is obtninc. C-2c. Viecosit.-Both tyl:ea slitin11 he SC) preriared that the finished material will liave a viscosity of 18CS RWOIS a
10、t 23;“ C, when deter- mine by method 428.2 of Feeral Spwiicition TT-P-141 uatng the consistency cup which has an orfice O.l5 olheiwisa spf-citicld in the continct or order. F-4. Tests.-The following tests sliiill be ui:ide nt a Governmciit laboratory unless otherwise specificrl in tlie coiifimt or o
11、rder. F4a. Zroa oside.-Stir the sample so as to mix thorouglilg, and trnnsfw n weighed poitioii of aproximritelp 2 gm. to n tired plntiiiuin or porcelsin crucible. Rertiove the combustible material by burning, and ignite the residue to constnnt weiglit. Calculafr the wdglit of residue to percentage
12、of iron oxide in thP s:iinple. F-ib. Akwio!.-Trnnsfer H weighed pcirtioii of 1.0 In 1.5 gm. of the thoroughly iiiixed mmple to a tnred g1ilSS or instal weighing dish 2 inches in diiimeter. Distribute! the milcint iii ng tliiit a layer as priic- JAK-C-99 - $. Provided by IHSNot for ResaleNo reproduct
13、ion or networking permitted without license from IHS-,-,-JAN-C-77 I3 9 7777706 02707b7 I M 3 lif:ii.de niid dry for li hours tit 75“ C. in the case of Type A material or far 2 hours in the case of Wpe B material. Cool the dish and contents in a desiccator and weigh. Calculate the loss in weight to p
14、erccntage of alcohol in the sample. F4c. SlreZlnc.-Weigli a fritted-glass crucible of approximately 40 1111. rapnciiy coiitciiniiip :I short glass stirring rod and approximately 15 gm. of clean smil which passes the No. 20 (840 micron) U. S. Standard sieve and is retained on the No. 30 (690 micron)
15、U. S. Standard sieve. Transfer 1.0 to 1.3 gui. of the sample to the sand in the crucible. Ayoid getting the sample on the inner wall of the crucible. Accomplish the transfer and weighing as rapidly as-possible in order to reduce to a minimum the error due to loss of solvent. Mix the sample thoroughl
16、y with the sand by means of the stirring rod. Heat the crucible and contents in nn oven nt tipproximately 100“ C, for ,4 hour, remove the crucible from the oren niid to the still hot crucible add 15 ml. of boiling carbon tetrachloride. Break iip the agglomerate as completely as pos- sible with the s
17、tirring rod. Allow carbon tetrachloride to remain in coritnct with the sainpie. with constant stirring for a total of appioxi- mntelg one miiiute then apply suction. Add a 10 iiil. portion of boillng caarhon tetrachloride. for the Navy, in accordance with the requirements of tlie latest issue of the
18、 Navy Shipment Narking Handbook. R. NOTES. H-1. Requests, requisitions, schedules, and contracts or orders should contain the title of the specification, the number and date. H-2. Uses.-The material covered by this specification 1s intende for use a$ a waterproofing cement in the loading arid ocsemb
19、ly of ammunition. H-3. Copies of Nary Shipment Marking Handbook inny be obtained upon application to the Bureau of Supplies and Accounts, Navy De partment, Washington 25, D. C. H-4. Copies of Joint Army-Navy speciflcations nn Federal SpeciIca- tions (required for Army purchases) and U. 8. Briny spec
20、ifications may be obtained, as indicated in the “Index of United States Army and Federal Specifications Used by the War Depnrtmcnt: Copies of this Index may be obtained from the Superiiiteiident of Documents, Govern- ment Printing Ofice, Washington 25, P. C. Agencies within tlie War Department will
21、obtain copies of Joint Army-havy, Uiiited States Army, and Federn1 Specifications through established War Department ehannels. Both the title and identifyiug symbol iiumber should be stipulated when requesting copies of specifications. H-5. Copies of Joint Army-Navy specificntions and Federal Specif
22、i- cations (required for Navy purchases) and Navy Department specifi- cations may be obtained upon application to the Bureau of Supplies and Accounts, Navy Department, Washington 25, D. C., escept that Nara1 activities should make application to the Supply Offlcer in Com- mand, Piavnl Supply Depot,
23、Bayonne, N. J. Both the title and iden- tifylng symbol number should be stipulated when requesting copies of specifications. Notice.-When Government drawings, sped6cations. or other data are used for any Purpose other than in connection with a definitely related Government procurement OperntlOn the,
24、 United Stntes Oovernmenf thereb incurs no re- sponsibility or any ob11 atlon whatsoever * and the fact that he Qoverament may have formulated furnlshed, or% ay way supplied the mid drawin specifications, or 0th k data, is not to be regarded by implication or otherwf% as in any manner densing the ho
25、lder or an other pereon or corporntlon or conveying my rights or permission to menuracture, une, or sell any patehed Invention that may in any way be related thereto, NAW: OS ._ - _ - - JAN-C-991 / TO OIFiCE i 1951 O - 9S9140 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
