1、MIL-E-12397B 18 NOVEMBER 1954 . c - - SUPERSEDING . . MJLE-12397A . 23 MAY 1953 . . “ .MILITARY SPECIFICATION . ERASER, RUBBER-PUMICE . (For Testing Coated Optical Elements). Th.is specification. has been approued by the Department of Defense for me of the Dspatments of the Amy, the Navy, and the Ai
2、r Force. 1. SCOPE 1.1 This specification covers one grade of eraser for use in testing the i abrasion re- sistance of reflection-reducing films for glass optical elements. 2. APPLICABLE DOCUMENTS 2.1 The following specifications, standard, and. drawing,. of the issue in effect on date of. invitation
3、 for bids, .form a part of this specification :- SPECIFICATIONS -. FEDERAL SS-F-S21 “Pumice; Ground, Ab- rasive. ZZ-R-601 -Rubber Goods ; General Specifications (Methods of Physical Test and Chemical Analyses). MILITARY . . . . JAN-P-120 -Packaging and Packing for Overseas Shipment, C-artons, Foldin
4、g Paperboard. MIL-B-4229 -Boxes, Paperboard, Metal-Stayed. STANDARD MILITARY MIL-STD-129-Marking for Shipment and Storage. IRAWWG . ORDNANCE CORPS D7680606 “Eraser, Rubber Plug. . * L . (Copies. of specifications, standards, and drawings required by contractors in .connection with specific procureme
5、nt functions should be obtained from the procuring activity or .as directed by the contracting officer.) - 3. REQUIREMENTS 3.1 Material. -. Eraser shall be made of high-grade rubber combined with 50, plus or minus 6, percent by weight of the abrasive s filler. The. abrasive shall be a fine-ground pu
6、mice conforming to grade FFFF of Speci- fication SS-P+21. .- . 3.2 Hardness, - Finished eraser shall have a durometer hardness of 75, plus or minus 5. 3,3 Accelerted aging.-Eraser shall shov a hardness change of not more than 10 points after being placed. in a. Geer oven for 7 days-at a temperature
7、of 168“ F., plus or minus 2“ F. 3.4 Shape and size.-Eraser shalI be in con- formance with Part No, 6 of drawing D7680606. 3.5 Workmanship. - Eraser shall be a uniform mixture of abrasive and rubber, free from any excessive holes, cracks, splits, or foreign particles which might adversely affect its
8、use. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-123978 75 E 9999906 0290153 b E 4.2 Inspection.-Erasers shall be inspedted . ,Do;lestic -.ghipment-extended storage. to determine compliance with 3.4
9、and 3.6 of “Same as 6.2, . . this specification. - _. . .- .* -. . - 4.3 TeetStandard MIMTD- . , . I . :inn . . - .- . 4.3.1 Filler content shall be determined in ILJ. accordance with Specification ZZ-R-601. Do not discard filler, use it for particle “size determination. 4.3.2 Partiale size of ubrmi
10、ue.-Conform- ance to the abrasive requirements. of 3.1 shall be determined by testing in accordance with Specification SS-P-821. 4.3.3 Hardness.-At least five erasers shall be tested for hardness in .accordance- with Specification ZZ-R-601. The hardness shall be determined on the ends of.$he eraser.
11、 . S - 4.3.4 Accelerated ugirg.-Five erasers shall be placed in a Geer oven or equivalent air oven at 158“ F., plus or minus 2“ -F, for 7 days and then tested as specified in 4.3.3. - 5. PREPARATION FOR DELIVERY 5.1 Domestic shipment - immediate use. “No preservative shall be required. Erasers shall
12、 be packaged in accordance with com- mercial suppliers practice. . 5.2 Domestic shipment - limited storage. -No preservative shall be required. Erasers .- 2 _1 I 6. NOTES 6.1 -Ordering. data - Procurement docu- - (aj Title, number.and .date of this spec- ments should ,specify. the following: - -? .
13、. - - ification. (b) Place .of inspection, Patent notice.-When .Government drawings, spec- ifications, or other dah are used for any purpose other “than .in conn.and the fact that the Government may have formul&ted,furilished, or in any way supplied the said drawings, specifications, os other data i
14、s not to be regarded by implication or otherwise as in any, manner licensing the holdes or any other person or corporation, os conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. Custodians: . Army-Ordnance Corps Navy-Bureau of Aeronautics A Force . . . . Other interest: .- . . . Navy-Or. . ._ . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
