1、#MOTE: The documnt identifier ad bendinghas been changed m this Pae r? efiutthat this is a perfo-e Spec!ftcatl on.There are m other chanses to this docment.The dxmem identifier on subsequent FWeshas mt been chewed, Lwt mill LIE ha.wdthe next time this document is revised.ML-PRF-900F30 March 1973SUPE
2、RSEDINGMI L- R-900E3 No”er16aer 1966(See b.b)PEIIFDAIL4NcE SPEC1F1L4TIONRUBBERCASKET )!ATERIAL. 45 DURCUETERHARDNESSThis specificatim is awroved for use by all Departments ad Agencies of the Departmnt of DefMSe.1. SCWE1.1 This specificatim covers rutt.er gasket material for watertight and airtight c
3、tosures, in thetewerature range of -20” to 130” F (-28.9” to 5m: however, a llght blmm of “on-liquid material shall be considered acceptable see.,.I 3.1.2 O= resistance. For ozone resistance, tbe material shall not show any crackson the surface when tested as specified (see 4.7.11) .3.2 Form. The ru
4、bber gasket material shall be furnished in the form specified (see6.2). Thi=rm may be sheets, strips of rectangular cross section, shapes cut from sheets,molded shapes, or a71xtruded shapes.3.2.1 Sheet. Sheet rubkr shall have smmth surfaces and shall have the thicknessspecified (se=2) . Unless other
5、wise specified see 6.2) , the tolerances in thicknessgiven in table 1 shall apply. The sheet rubber shall be furnished in rolls approximately3S to 42 inches wide. Unless otheimrise specified, rolls shall weigh 100 : 10 pmmds, anda roll of sheet rubber 1/0 inch or less in thickness shall consist of n
6、ot more than fourlengths. A roll of sheet rubber over 1/8 inch i“ thickness shall consist df not more thanthree lengths.# 3.2.2 Stri;d * -med (spliced) seams.The rubber shall conform to the physical requirements* 3.3.1 Joined seams. The tensile strength and ultimate elongations of joined seamsbefore
7、 and aveing shall be not less than 80 percent of the requirements specifiedin table 11 and tested in accordance with 4.8. ,-r:. . ,.;.2 . ,.I .Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,FIII. -R-9OOFTable 11 - Physical requirements of rubberIIn
8、itial properties:Tensile strength, Psi, a75inimumUltimate elongation, percent, .niniummHardness, durometer unitsSpecific gravity, maximumSeaiing pressure, psi, minimumProp-3rties after oven agingTensile strength, percent of initial, minimumUltimate elongation, percent of initial, a75inimumKard.ess,
9、d.rometer units, maximumnot compression set, percent, maximumSealing pressure, psi, minimumProperties after light aging:Tensile serenqth, 2;al-e%de%;rom each lot in accordance with 4.2.2.1 and 4.2.2.2.For the emmination. specified In 4.3 representative4.2.2.1 Sam lin of material in rolls.and the saM
10、Ple+$+T tmmbeThe lot size shall be stated in square feetrs oMD-105 at Inspection L.svel 11 shall be used. Thesample shall be selected in equal auounts from 4 rolls, or from ail of ,the rolls if thereare less than 4. The acceptable quality level (AQL) shall be 6.5 defects per hundred unitsfor major d
11、efects and 15 defects per hmdced units for total defects, .;4.2.2.2 SamPlinq of qaskets. Gaskets +hali be sampled in accordance th table III., .:.,.3. ,.,.,IProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-!$lL-R-900FTable 111 - Samplinq for .examimic
12、ion of gaskets.Number of gaskets in sampleDiameter or width of gaskets (inches)Num31 to 1600 80 50 32 20Iot.s: The acceptance mmbers are as follows :S.amph sizes 2 3 5 8 13 20 32 50 80Acceptance number,.Xajor defects O O 0 0 0 1 1 2. 3!4inordefects O 0 1 1 2 3 5 7 104.2.3 Sanmli”q for tests . Repres
13、entative materia3 shall be selected at random fromeach lot that passes the requxrerae”ts of 4.3 in accordance with table W to conduct theproduction check test or the quality conformance tests specified in 4.4 and 4.5, as applicable.Table W - Sampling for tests.Sample sizeYYNumber of“1 specimens requ
14、ired-t size, pounds Of aterial for each testup to 80 -. I 181 to 170 21171 to 3S0 3351 to 700 4701 to 1400 5401 to 2500 7,/ In sheet and sfrip material, each test specimen shall be cutfrom a Aifferer.t roll. If this is net possible, then from adifferent lmgth in the roll.V If tia tw= .=. of such siz
15、e 0. shape that t.st seeci=n.cannot be prepared from them, substitute specinrLs shall beprovided in the form of a piece or pieces of rubber havingdimensions appropriate for fhe tests required. Material forthese speci=”s shall be taken from different parts of thebatch or batches used to make the item
16、s to be representedby the specins. The substitute specimens shall be certifiedto have received a cure equivalent to that used in the lotof finished material offered for delivery.4.3 Examination. Each of the samples taken in accordance with,4.2.2 ,?hall be sub-jected to examx”atlo” for Workmanship, d
17、imensions, tolerances , and exudation of plasticizer.;41L-ST12-2E9, MIL-STD-298 , and MIL-6TD-407 shall be wed to determine .“andevaluate vismldefects. -;.;. ,. . . ,.”4. . :,Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-!41L-R-900Fsample exceed th
18、e applicablethe entire lot represented by the4.4 Production check tests. Production check tests shall be conducted on samplesfrom (or represe.tmg - lot of -tari.l and from every tenth lot hereafter. ill1the tests specified in 4.7 and 4.8 shall be conducted.4.5 Quality Conformance tests. Quality conf
19、ormance tests shall be conducted onsamples from (or representing 1lots on which production check tests are not conducted.The tests specified in 4.7.1, 4.7.2, 4.7.3, a“d 4.7.5.3 shall be conducted.4.6 Action trmn th i“ilultimate elon ation.-,=thodTensile strength and .1timate elon-gation sballermne s
20、 41rl;!l %T%tspecimens prior to a co”ditio”i”q periti of 4 hours at.27- +.5*C (80-.+ 9.F).preearatiOn -Y undertaken wiOut regard to thks time iKterval. . . s,.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L- R-900FI4.7.7.1 Rard.ess after low ter
21、n rature a in Hardness shall be determined by method,5511 of FED-STD- 1%.7. The i“ste.”ta”eo.s readi”q shall beafter aguiq as s?ecx xetake” “sing a Shore A type durometer.4.7.7.2 Cold compression . Cold compression set shall be determined in accordancewith method 54f FSD-STD-61. The specimens shall
22、be compressed to 40 percent deflectionduring aqing as specified in 4.7.7.4.7.0 volume c-. The change in volume shall be determined after immersion indistilled wan accordance with method 6211 of FED-sTD-601,time shall be 24 1/4 hours.except that the immersion4.7.9 Extraction in distilled water. The p
23、ercent extraction ?.balkbe determined bym.tkd 6621 of FED-STD-L, except he specimens shall be 1 by 2 by 0.080 z O.010 inch.4.7.10 Delamination. The delamination tast shall be conducted i“ accordance withmethod 6311 of FED-STD-601 .4.7.11 ozone resistance. Specimens shall be tested in accordance with
24、 MTM D1149-64with the folq addit,ons a“d rmdificatio”s:(a) The test sPecimen for procedure “8” shall be used.(b) The 24 hour prec.anditiominq period (while stretched) shall be in an”oven at40” + lC (104. + 1.8-F).(c) The oone concentration shall be LOO + 5 parts per hundred million by volume.d) The
25、test temperature shall be 40” + lrC (lo4” 1.S”F) .(e) The exposure time shall be 70 hour; + 1/2 hour.(f) Maqnif icatlon shall be 7-Power for ttieexamination of duplicate specimens.co.fia;=a-t=detemine the strenqth properties of the band joint. ForSeams which are joined (spliced) to form the properth
26、is evaluation, all tensile property determinations required for prad”ction check tests(see 4.4) , or quality conformance tests, (see 4.51 as appropriate, sMLI be conducted onspliced specimens. If dimensions of the rubber gasket material beinq procured precludes aspecimen beinq tested on a tensile te
27、st Irachi”e, appropriate size spliced specimens shall2/ These substitute specimens shall be certifiedbe used to represent the procured _terlal. -ta have been spliced in a manner identical to those materials offered for delivery.4.9 Examination o re aratio” for deliver . The packaqing, packi”q, and m
28、arkingshall b examned df this doctient.for C=P lance w.th sectao.5. PREPASATION FOR DE3.2VERY(The preparation for delivery requirements scified herein aPPIY OnlY fOr directGOver-nt procurements. For the extent of applicability of the preparation for deliveryrequirements of referenced doctients liste
29、d in section 2, see 6.3. )5.1 Packaqinq. Packaqiq shrill be level A.or C as specified (see 6.2) .5.1.1 Level A.5.1.1.1 Rubber sheets and . Rubber sheets shall be unit packaqed in rol1s andsecurely tied depent unrolling. strips shall be individually coiled andsecurely tied with salvaged duck cloth. S
30、heets and strips shall be packaged in accordanceWith method 111 of MI L-P-116 .5 .1.1.2 Cut, molded, and extruded gaskets. Gaskets shall be packaged in accordancewith method lll%f HrC=F=llr5.1.1.3 Interior containers. unit and intermediate containers, when used, shallC.anfem to PPP-B-56 6, PPP-B-636
31、 , or PPP-B-676, at the option of the suwl.ier. Containerclosure, veight limitation, cmd sealing shall be in accordance with the applicable containerspecificatio. or appendix thereto. ,e men test specimens cannot be prepared from the 9askets; substitute, slis ?!=.11beprovided in the form of pieces o
32、f rubber havinq dimensions aeeropriate .to the te.tsrequired. The substitute samples shall becertified to have received an equivalentcure and to have been selected from the same material used to make up the lot ofmaterial offered for delivery.6. ,., .!Provided by IHSNot for ResaleNo reproduction or
33、networking permitted without license from IHS-,-,-III,!lI.-R-900F5.1.2 Level C. Packaging shall afford protection aqainst deterioration and physicaldamaqe durinq sh,p;ent from the .UPPIY source tO the usi.9 activity for immediate use.5.2 Packiny. Packi”.q shall be level A, B, or C, as specified (see
34、 6.2)5.2.1 Level A. Rubber sheets, strip., cuc, molded, and extruded gaskets, packaged asspecified (se=2r, shall be packed for shipment in containers conforming to .1.ss weather-resistant of PPP-B-636, or class 2 of PPP-B-640 , at the option of the SUWlier. saxes con-forming to PPP-B-636 shall be cl
35、osed, waterproofed , a“d reinforced inaccordance with therequirements of a75ethod V in the e.p?endix to PPP-B-636 as applicable to class weather-resistantboxes. Sexes c0nformin9 to PPP-B-640 shall be closed, waterproofed, and reinforced i“ accord-ance with the requirements of the appendix to PPP-B-6
36、40. The gross wei.qhc of fiberboard boxesshall not exceed the weight limitations of the applicable fiberboard box s!aecification. Incer-r,ediate fiberboard containers see 5.1.1.3) conforming to class weather-resistant of PPP-B-636,closed, sealed, and banded as specified herein =Y be used .= the ship
37、eing cOncainer and neednot be overpacked,5.2.2 Level g. Rubber strips , cut, molded, a“d extruded gaskets , packaged as .soecified(see 6.21, s-be Packed in containers Confoming to the requirements of class domesticof PPP-8-636, or C1?. SS 1 of PPP-B-640, at the optl,on of the supplier. t 5330-0425)A
38、ir Force - 82 ,“. ,-Reviev activities:Y - MS, WC, !61,MU .: .:Navy - SHAir Force - 82. DSA - 2S ,., .user activities:Navy - MC, YO7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,0(.0CONMMDERNAVAL S1fIPENGINEERING CENTERCENTER BUILDING - SEC 6124B P
39、osTAGC ANO VCUPMOPRINCE GEORGES CENTER OEPART:ISNT OF NAVYD*HYATTSVILLE, :NARYLAND 20782 =OFFICIAL 8US1NEM00D 316,C14AL1Y PoR PRIVATE “SC S300CQlNANDERNAVAL SHIP ENGINEE?.lNG CSNTEP.CENTER BUILDIliG - SEC 6124BPRINCE GEORGES CiXiTERHYATTSVILLE, NARYLANO,. 20782,“,. . - . ,.,. . ,:.,!-Provided by IHS
40、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL I OMB APP,ovalNo. 22-R255INSTRUCTIONS: The purpose of this onn is to solicit beneficial comments which will help achieve Pr.c.re-nmnl of suitable products at re. son.,ble
41、s1 and minimum delay. or will otherwise e,nhance .s. of the document.DoD cmtractors, o.emme.t activtttes. or mnfacturers/ v.nd.rs who are prospective pp!iers of the productare invited to submit comments 0s the wavenwne.t. Fold o. lines m reverse side, staple in corner, d send tow.pri.e .iw. C.mm=.1,
42、 bmitted . . thi, (0 dO t . Sti.t.t. .r imply =.*.riz.ti t. w.iv. YP.rt, .f the r,. f:rence? d.cu,me. t(s) or 1. amend c.mtracta! r.squmments. Attmch any pertinent data whichmay be d use m mpmvmg th, s document. f there are add, tmnal papers, attach m form md plsce bath i. menvelope .ddressed 1. pre
43、paring activity.!OCUMENT IDENTIFIER ANO TITLEAME OF oRGANIZATION ANO AODRESS COMTRACT NUMBERMA TER8AL PROCURED “NOER A50, REC O”E*WME”*CON,.AC7 0s.0.7.,“AS AN? PhRTQF TME OOCUWENT CREATED PROBLEMS OR REQUIRE!J ,NTERia RET AT, ON ,. PROC”n Ehle. TUSE1A. .!”. .A. .G. .P” F4UU. EH 0 WOF!O, NG. . nLxco”
44、MsNo., oN, ,0. C6R!4CC,14G T“ O, C,= NC, E,COMMENTSON ANV DOCUMENT REQUIREMENT COUSIOEREO TOO RIGtOIS THE DOCUMENT REST RICTf VE1o v., O NO f7f-.Y-. ln*,?J.,?JREMARKS,UEM!TTEO 9Y (Prl”#.dor WP. d”m. -d add,. - OPtl.m.f) TEL EPMON:,NO. .-,.,. . .OATE. . - -DD, Y-i,1426 .REPLACESEDITION ov I JAN m w“ICW “*V -E USEDSIN Olol-a, ,-, aoz.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
