Document vV8xVKpLdrm04j69YpgVLL2m

PLAIN I ll-PS |-r.. EXHIBIT/*';;; v>: 003521 MIL-C-2908A 29 MARCH 3960 SUPERSEDING MIL-C-2908 * SEPTEMBER 1951 muitary specification CEMENTS, FINISHING, INSULATION Thii tpeexfication has been approved by tkr Oepo^nunt of Defence and ****** datory for ** &V W* Departments of tU Army, the Navy, and IJu Air Farr,. 1. SCOPS 2.2 Scope. This specification covers asbestos finishing cement (type 2) lor use as a finish coat on thermal insulation, and mineral wool finishing cement (type II) for use as a finish coat on thermal insulation and as a combina tion insulation and finishing coat on small pipe fittings. 2.2 CkssiBcaUan, Finishing cements shall be of the following types, as specified (see 6.1): Type I --Asbestos. Type II -- Hydraulic setting mineral wool. 2. APPLICABLE DOCUMENTS 2.1 The following specifications and stand ards. of the issue in effect on date of invita tion for bids, form a part of this specifica tion : SPECIFICATIONS Federal RR-S-366 --Sieves, Standard for Testing Purposes. UU-S-48 --Sacks, Paper, Ship ping. MILITARY MJL-J-2829 --Insulation, Thermal. Efock. STANDARDS Federal Fed. fctd. No. 791 -- Lubricants, Liquid Fuels, and Related Products; Methods of Testing. Muitasy M3L-5TD-10S --Sampling Procedures and Tables for In spection by Attrib utes. Mil./-STD-129 -- Marking for Shipment and Storage. (Copses of >ipoific*tjofls. standards, drawfaga, and publications required by contractors In tonrseoiioa with specific procurement functions should b* iidnJntd frozs ih* procuring wtirjty nr %s directed fey the eontractfnff officer.) 2.2 Other publication*. The following docu ments form a part of this spedfscationUsdess otherwise indicated, the issue in effect on date of invitation for bids 6hail apply. FSC 5*40 MC 421724 . B OO01 WV-05740 "I^2908A 003522 SoassnAmerican for Tbstxno Hatsmals STANDARDS ASTM Method 0-177 -- Thermal Con Table T. PAftivai i*gut>em*nte. fmi twn ductivity of Materials by Means of the Guarded Hotplate, Method of Test for. ASTM Method C-S54 -- Compressive Covur*g (wet), board feet per 100 pound* of dry material, min imum. Shrinkage, vriametric, wet to dry, percent, maximum. 30,0 so.o to.o Strength of Thermallnsuiating Cement, Method of Teat for. {Application toe eopU* should be addressed to the American Society tor Testa? Materials, 5916 Race Street, Philadelphia 3, Pa.) Density, after being molded and dried, pounds per cubic foot, maximana* Hardne&s, after bang melded and dried, penetration, millimeter, maximum. 9.40 40.0 Official Classification Committee Uniform Freight Classification Rules. (Applicative for eoplea should be addressed to the Official CJssfiVfcaSioa Committee, I Part Arens* at 8Srd Street, New York 16, N. Y.> 3. REQUIREMENTS Resistance to abrasion, after be ta? molded and dried, leu in weight, percent, maximum: After first 10 minute*.............. After *eeond 10 minute* ........... Comprewlv* strength (at 5 per cent deformation), arer*?*, pound* per square inch, mini mum. ........ 20,0 40.0 100 3.1 Materials. Change under soaking heat after 6 hour* at * F. 300 1200 3.1.1 Type T. Type I cement shall be com posed of a dry mixture of asbestos fibers, fillers, and suitable binders thoroughly mixed to obtain a uniform distribution of the in gredients. Hardness, penetration, milli meter, maximum Uu In weight, percent, maxi mum. Linear shrinkage, percent, max imum. Therms! conductivity, maximum, 0.40 JO.O 2.0 3.1.1.1 A8bf.stoa fiber content. The asbestos fiber retained on a U.S, Standard No. 100 mesh sieve, conforming to Specification RRS-366, shali be not lass than 60 percent nor B.t.u./hr./sq. ft. 1*F,/ Inch st meus temperatures: 200* F. .................... ........... 600* F. .................. ............. O.SO : MO Hone more than 85 percent by weight of the ce ment (see 4.4.1). 4. QUALITY ASSURANCE PROVISIONS 3.1.2 Type ft. Type K cement shall be com posed of a dry mixture of nodulated rock or mineral wool fibers and a hydraulic binder. 3.1.3 The composition of type I and type II cements shall be such that when they are properly wetted with fresh water they can be applied with a trowel or by hand. 4.1 Unless otherwise specified herein the supplier is responsible for the performance of ail inspection requirements prior to sub mission for Government inspection and ac ceptance. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Gov ernment. Inspection records of the examina 3.2 Physical requirements. The cement tions and tests shall be kept complete and shall conform to the physical requirements shown in table I. available to the Government as specified in the contract or order. MC 421724 (4 0002 003523 MIL-C-2908A 4,2 Sampling. 4.2.1 Lot. For purposes of sampling, a lot shall consist of not more than 50.000 pounds of finishing cement of one type produced under essentially the same conditions and offered for delivery at one time. 4.2.2 Sampling fnr csnsnmafiein of fitted contains**, A i-andom sample of filled con tainers shall be selected from each lot offer ed for inspection in accordance with Stand ard MIL-STD-IOR at inspection level I and acceptable quality level *=* 2.5 percent de fective to verify compliance with all stipu lations of this specification regarding fill, marking, and other requirements not involv ing tests. 4.2.3 Samp/tnp for acceptance its*?. From each lot offered for inspection. 2 sample containers shall be selected at random for the tests specified in 4.3.2. 4.ft Acceplance inspection. 4.3.1 Ezamnnlion of fitted containrr* at the place of mnnnfasfwr. Each sample container selected in accordance with 4.2,2 shall be examined for defects of the con tainer and for unsatisfactory markings. Each sample filled container shall also be weighed fo determine the amount of the contents, Any container in the sample having one or more defects, or under required fill, shall be re jected. and if the number of defective con tainers in any sample exceeds the acceptance number for the appropriate sampling plan of Standard MIL-STD-I0S. the lot represent ed by the sample shall be rejected. Rejected lots may be resubmitted for acceptance in spection provided that the contractor has re moved or repaired nonconforming con tainers. 4.3.2 Acceptance texts. 4-3.2.1 Type l cement. The sample speci mens selected in accordance with 4.2,3 shall be subjected separately to the tests specified in 4.4.1. 4.4.2.1. 4.4.5 and 1.4.8.!, 4.5.2.2 Type U cement. The sample speci mens selected in accordance with 4,2.3 shall be subjected separately to the tests specified in 4.4.2.2, 4,4.3, 4.4.4 and 4.4.6. to 4.4.10, in clusive. 1.3.2.3 Action hi rase of failure. If any sample is found not to be in conformance with the requirements of this specification, the lot which it represents shall be rejected. Re jected lots may be resubmitted for acceptance inspection provided the contractor has re moved or reworked all nonconfosmine products. 4.4 Test procedures. 4.4.1 Asbestos fiber content. A standard laboratory testing sieve shaker which oper ates with a horizontal eccentric circular mo tion at 285 -s: 10 revolutions pr minute and a tapping action of 150 := 5 strokes per minute shall be used to determine the as. bestos fiber content. A weighed quantity of the material shall be placed in a covered fl inch diameter 100-mesh sieve over a retain ing pRn and secured in the shaker. After shaking for 10 minutes with tapper in oper ation the asbestos fibers remaining on the sieve and the fillers and binders contained in the retaining pan shall be weighed sepa rately and their respective percentages of the total sample calculated, 4.4.2 Corcmpc capacity. 4.4,2.1 Type I. Dry cement shall be mixed with water to a wet consistency of 26,5 ^ 0,5 mm. as determined by method 311 of Standard Fed, Std. No. 791. and immediately troweled into a rectangular trough 8 inches wide and one inch deep and of length vari able up to 30 inches. The surface of the cement shall be squared with the top edge of the trough and at both ends of the area cov ered. The surface area shall be measured. The coverage shall be*expressed as board feet covered per 10ft pounds of dry material. The average of three determinations shah be reported as the wet coverage. 3 tIC 422 724 A? 0003 MIL-C-2908A 003524 4.4,2,2 Type ll. A weigh'd quantity of the dry cement shall be mixed with a weighed quantity of water. Weighed quantities of water shall bo added and mixed until the consistency is such ns to permit satisfactory application to a surface by troweling. Immedi ate!.'* after bring mixed to n UwtUfi? con- si*tcu';y, the cement shall !> tvo*vch*<l int<> a rectangular tr'ui<;h 3 inches v.*;de uud I i.-U'h d<?w> srrj "> 'eutfth v;*.viable to 20 inches.. The surface <>f the cement shrfil be sqcujxrft with the t;j -."fae <tf *he and at lxl>> cut!* of the area covered. The sur- f;uv j.rvu >?i;*!| be mcuuved. The coverage shall ho '?;p:'38`2<* as board feet covered per 100 pound-: of dry material. The average of S tfeew'nrir.rtri'uK ='*2li *w jeiv-rtc/l the wot coverage, 4,-1it)bv-'1. The sampler prewired for the < ecu we '-a*vieit'* test of 1.-1 2 shall bj u.,*d fvr Ihi' test, Fach sample ?l*n1l ho plac'd i m ;: nxtrd ring mold 10 inches :n dlame'er ;<',d !<a iVc'rv* deep, mounted b> u horizontal pvltion <ui :; 12- by 12-inch piece of p'ato gins*. '|,'w ton surface of the? cement shrift V- I'mvvM smooth and a piece of ordi nary wrUmq paper shall be placed thereon. A sfve! jiLjte 12 inches square bv inch tircl; wit': ric oounfty spaced 3'../inch di ameter !:?h*s in tuc ces.trai area Id fr>che< in ;lkimeter. tlmil bo then placed on top of the mold. The paper shall be punctured tnrough the holes ,-md the entire assembly inverted. The plate glass shall lx? removed and the surface of the cement troweled smooth and leveled with the surface of the mold. The moM ?hntl be carefully removed. und the molded sample allowed to stand at room temperature (77* rr 2*F.) for 21 hours. The irtrtbrated pfnfe with Che molded cement thereon shall be placed on an open shelf of an electrically heated oven and dried to con* st.int wpigbt .at SPOT, The samples shall bo measured within 10 minutes after cooling ami the shrinkage reported as the percent* *e reduction in the original volume suf fered during drying. 4.1.1 Density. Molded specimen* *hall lw xir dried for 21 hours and therj dried at 30G*F. in an electric oven to constant height and the density computed on the oven dried volume. 4.4.5 Hardness. AAO.I Hardness shall be deter mined on the plastometcr, which shall con sist mainly of 2 pnrnfM matn) disks sup ported on uprights, to which are fastened a thin rod with *k-ineft diameter bnI? point. .*? measuring gage graduated In 1 mm. divisions, and a kilogram weight. 4.4.5,2 5/w.mo's, The specimens for the test .ritaU be rr.ede by apply}*# the foment, prepared as specified in 4.4.2. to this sur face of an insuction block conforming* to Specification MIL4-28M>. A thickness of inch shall be obtained by securing 4 (-inch diameter rod guides along* the ed#es of the block insulation. The specimens shall be air 11ricd. 4.4.5.:* P>oredurc. The specimen shall be ponced under the instrument and the M<*ir.ch ball point brought down on the surface of the specimen until the index hsnd o? the measuring gage makes two complete revolu tions. The kilogram weigh*, shall be slowly released from its supporting disk and allowed to rest on a shoulder of the bali point holder, causing the bail point to sink into the specimen. The depth that the ball point is depressed into the specimen shad be read on file graduated measuring gage dial to 0.01 mm. The results shall be reported as the average of 10 readings. 4.1.6 Rcsfrfanee fo 6jribn. TVelve Much cube specimens. cut from the molded disks used in 11.3 to determine shrinkage, and jwenty-four Sf-incb esk cubes (specific grav ity of wood. 0.65} shall he placed in an onk box having inssrfe dimensions of "U be T-`\ by 7?i inches. The horizontal axis of rota tion of the test chamber shall'be novmal to .<r?d m the center of the ?*'* by l'\ \x^h face. The opening of the oak box shall be closed and if shaft be rotated about its own uxis at a speed of 60 revolutions per minute \ mc 421224 a 0004 00352<> BHL-G-2908A tor two 10-minute periods. At the cad oI each 10-mlnute period the cubes shall be removed from the box, the box shall be cleaned, and the cubes of the material under test shall be weighed to determine the per centage loss in weight due to pulverization and breakage. 4.4.7 Compressive strength. The compres sive strength shall be determined in accord ance with ASTU method C-354. 4.4.6 Physical changea under soaking heat 4.4.8.1 Type l cement. Specimens prepared as specified in 4,4.5.2 shall be air dried and then subjected for 6 hours to a temperature of 300*?. in an electric oven. Then the speci mens shall be removed from the oven and the hardness determined by the method spe cified in 4.4.5.3. 4.4.8.2 Type U cement. Specimens 5 by 2 by X inch, cut from the molded disks used In 4.4.3 to determine shrinkage, shall be weigh ed and measured. They shall then be sub jected for 6 hours to a temperature of 1200*F. in electric oven. The specimens shall be removed from the oven and tested to determine loss of weight, linear shrinkage, and hardness. 4.4.9 Thermal conductivity, Thermal con ductivity shall be determined in accordance with ASM method C-377. temperature for SO days. Then the cement shall be removed from the test plate. The test plate shah be immediately cleaned with water, wiped dry, and examined for corro sion. Corrosion along the edges of the plate shall fee disregarded 5. PREPARATION FOR DELIVERY 5.1 Packing. 5.1.1 Level A. Cement shall be furnished in 50-pound quantities in paper shipping sacks (consUuetion 5x) conforming to Spe cification tflf-S-46. No additional packing will be required. 5.1.2 Level B. Cement shall be furnished in 50-pound quantities in paper shipping sacks (construction lw) conforming to Spe cification 'UU-S>'48. No additional packing will be required. 54.3 Level C. Cement shall be packed in a manner to insure carrier acceptance and safe delivery to destination at the lowest applic able rate. Containers shall comply with the Uniform Freight Classification Rules or other carrier regulations applicable to the mode of transportation. 5.2 Marking. In addition to any special marking required in the contract or order, marking for shipment shall be in accordance with Standard MlI.r-STD-129. 4.4.21? Corrasbnmsisiattce. Cement in plas tic form shall be applied toa polished steel test plate 4 inches wide and 6 inches long. The test plate shall be dear finish, cold rolled strip steel, 0.020 inch thick, American quality quarter hard, temper No. 3, weighing 0.85 pound per square foot. The cement shall be built up to a 3-inch thickness on the test plate iu a wooden mold 4 inches wide and 5 inches long, aod allowed to stand at room 6. NOTES 6.1 Ordering data. Procurement documents should specify the following: (a) Title, number, and date of this spe cification. (b) Type required (see 1,2). (c) Selection of applicable level of pack ing required (see 5.1). 5 MC 421724 R 0005 MIL-C-29084 00352u Notice. When Government drawings, apecTfleatiena, cr other data an usd Sot any purpose ether than In connection with a definitely related Government pro* cerement operation, the United Slates Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Government may have formulated, furnished, or in any way enpplied the said drawwgs, specifications, or other data & aot to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, ose, or aeU any patented Invention that may ta any way bo related thereto. CasiodUnss Array--Ccrpe of Engineer* Nry--Bwvan of Ship* Air Force Preparing activity; Nvy--Barcas of Ship* (Project 70Jt-6> Ov.i <,vr*xui>tt amn* emci. 6 MC 421724 Ft 0006