1、I MILITARY SPECIFICATIOH c-19-20 1-10857( EA) 12 November 1974 SPERSEDIN MIGG10857C(MU) 20 January 1970 1 CXOT, A“iIFOCGl3G This specification is appoed for use by all Ie- partments and Agencies of the Departmnt of Defense. 1. SCOPE 1.1 2. APPLIcABL4Ewmm 2.1 Government documents. The following docum
2、ents, of the issue in This specification covers one type of lens antifogging cloth. !. 4. effect on date of invitatidn for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICA!TIONS . I FEDERAL LP-504 - Plastic Sheet and Film, Cellulose Actate. CC
3、C-C-458 - Cloth, Cotton, Flannel. FED-STD-123 - Marking for Domestic Shipnent (Civil Agencies), FED-CTD-595 - Colors, . FED-STD-191 - Textile Test Methods. ta,-STD-105 - Sampling Procedures and TaSles for ns_Dectlon by Attributes. FSC 4240 . 9 THIS DOCUMENT CONTAINS ,. PAGES. Provided by IHSNot for
4、ResaleNo reproduction or networking permitted without license from IHS-,-,-. . . . . . DRAUINGS . .?-16-2 - Cloth, Antifogging. DLB136-10-150 - Test Device, Fogging, oi76, Data List. . (Copies of specifications, standards, drawings, and publications required by suppliers in connection vith specific
5、procurement func- tions should be obtained fromthe procuring activity or as directed by the contracting officer.) b 3. REGUIrnrn*rn 3.1 Material. The antifagging cloth shsll consist of a base fabric conoming to type III, class 1, of CCC-C-458 hpregnated with any non- toxic surface-active agent that
6、permits the cloth to confom to this s peci iicat ion. 3.2 Dimensions. The dinensiocs of the antifogging cloth shall b 6.00 inches 2- 0.25 inch by 10.00 inches + 0.25 inch (see Drawing A5-16-2). 3.-3 Edging:. ,All eQing of the cloth dhallbe pinked or free from c - raveled edges. 3.4 Odor. The antifog
7、ging cloth shall have no ob2ectionable odor. 7 3.5- Color. The color of the antifogging cloth shdl amroximate color gray NO. 36307 of TE-sTD-. 3.6 Ereak.ing ctrenki. mer. tested as specified in 4.4.4.1, the imtifcgging cloth shall have R breakinr strezeh, Eefore ydnc, of no less than 30 Fercent of t
8、hat required for the base febric. After aging as specified in 4,4.4.5+ the cloth shu iiave a DreakioL: strength of no less than 67.5 percent of thct required of the base fe3ric. 3.7 Toxicity. The actifogging cloth shall be nontoxic. The supolier shall submit objective evidence in accordance with 4.1
9、.2.2. 3.8 3ildemroofhess. hc antifoggin4.5,. . , - . - 3.10 Abrasson. The entifogging cloth shall not scratch or abrade cellul-3e acetate when tested as specified in 4.4.4.4. 3.ll Preproduction. Prior to the start of reguiar production, a .preproduction sample of antifogging cloths shall be produced
10、 in accord- ance with this specification for examination and tests (see 4.3). 3.12 Workmanship. The antifogging cloth shall be free from loose strips, raveings, amage , and contamination. 4,. QUALITY ASSuRAmcE PROVISIONS l, 4.1 Responsibility for inspection. 4.1.1 Suppliers responsibility. Unless ot
11、herwise specified in the contract or-purchase order, the supslier is res-nsible for the perform- ance of all inspectipn requirements as specified herein. otherwise specified ?nthe contract or order, the -qplier may use his 8wn or any other facilities suitable for the performance of the inspec- tion
12、requirements ep.ci Thirty antifogging cloths shall be selected at random from each lot. , 4.4 .3 Inspection procedure. 4.4.3.1 For examination. Sample antifogging cloths shall be examined in.accordance Kith the classification of defects and %IL-STD-105. 4.4.3.2 For test. The sampjLe cloths shill be
13、divided into groups and tested in accordance with table II. The acceptance number is :gro. Table II Redar production testing. NiimiDer of cloths Re qui rement : EeforeLaginp, : After aging : Test method : : Breaking strength 5 . 5 : 4.4.4.1 : Antifogging properties : 5 5 : 4.4.4.3 : : Abrasion 10 :
14、4.4.4.4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4.3.3 Classification of defects. Cat e gor i es Antifogdng cloth (bwp;. A5-16-21. Defects . Critical: None definea Major: AC Fercent. The cold chp.nber li the viewing window the typkitten mate
15、rial fastened on the back wail of the cold chamber of the box. .de fodng of fog or water droplets to such an extent as to prevent reading of the typed material through more than 25 percent of the area of the glass sheets at any time during the i5 minute test ,period, shall be considered a failure. o
16、f the antifogging cloth. The sheets 4.4.4.4 Abrasion. The surface or a four-inch,by four-inch piece of , . 1/64-inch thicki cellulose acetate sheeting conforming to type 1 of L-P-504 shall be wiped 10 times with each antifogging cloth and vlsually observed for scratches and abrasion. 4 4.4.5 Propert
17、ies after accelera$eri aging . The antifogging cloths to be sed shall be placed in a standard oxygen bomb at TO0 2O C,and oxygen pressure of 300 + 5 pounds per square iqch (gage) for 72 hours. After aging, the cloth chal1 be subjected to breaking strength and antifogging tests as specified in 4.4.4.
18、1 and 4.4.4.3, respectively. B . 5. PREPARATION FOR DELIVERY 5.1 Packaging, packing and marking, interplant shipment (see 6.4 ) . The antifogging cloth shall be packaged and packed to provide adequate protection from the supply source to the first receiving activity for irmediate use or further proc
19、essing. Shipping containers shall be in compliance with the rules and regulations applicable $0 the mde of transportation, Marking shall be in confoncance with FED-STD-123 and shall include the contractors name, address, and contract number. 6.1 Intended me. The cloth covered by this soecification i
20、s intended for use in the treatment of chemical-biological mask lenses to prevent fogging. 6.2 Grdering data. Procurement documents should specify the follodng: (a) Title, number, a?d date of this specification. Provided by IHSNot for ResaleNo reproduction or networking permitted without license fro
21、m IHS-,-,-I- MIL-C-LO857D 92 7777706 0233852 5 U I L-C-10 85 7D ( EA ) (b) Preproduction: - l) Government test and evaluation after award of contract. (2) perfonxe3 by the Government. (3) whether or not to proceed with production. been subjected to some chedcal or physical mixing orocess intended to
22、 mike the final product substantially uniform. 6.4 Intemlant shipments. Packaging for supplies and materials which Kill not enter the militarysupply system. micd infqrpiant Shipments are shipments from a vendor or e subcontractor or a priine contractor, or from a subcontractor to a prime contractor,
23、 or fTom 8 vendor or co?tractor to a military arsenal or plant. Time allaved for supplier submission of samples for Hane and address of test facility when testing is Time required for the Government to notify the suoplier A batch is defined as that quantity of material which has 6.3 Batch. - 6.5 Int
24、ernational interest. Certain provisions of this specification are When mend- the subject of international standardization $TAG 216 an 234. Zent, revision, or cancellation of this -specification is proposed which will affect or violate the international agreement concerned, the preparing EctiVity wil
25、l take appropriate reconciliation action through international standardzation channels iilcluding departmental stmdardization officer, if required. . Custodian : AIZY - EA * U. S. GOVERNMENT PRINTING OCFICC 1974 -603- 113/3323 Preparing activity : Army-u ProJect No, 4240-A635 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
