MIL-DTL-25988C
3.6 Identification of product
3.6.1 Sheet and strip
Unless otherwise specified (see 6.2), sheet material (including strip cut from sheet) shall be
marked to show the specification number, the manufacturer, the manufacturer's designation
(compound number), class, type, grade (if applicable), and the date of manufacture (by quarter
and year; for example, 1Q82), thus:
MIL-DTL-25988C XYZ Co.
Compound No.
Type II, class 1, grade 60
Date of manufacture
The material shall be marked for identification in compliance with MIL-STD-190. The
identification shall be applied in recurring pattern in lines from one end of the sheet to the other;
shall be in intervals spaced 8 inches (203.2 mm) maximum apart on the line; shall be in rows 5
± 1/2 inch (127 ± 12.7 mm) apart lengthwise of the sheet. The marking shall be applied by
suitable means using a marking fluid that is not deleterious to the fluorosilicone elastomer
rubber. The marking shall not be obliterated by normal handling and the color shall be of
sufficient contrast to permit easy reading.
3.6.2 Molded parts and extruded shapes (including tubing)
Where the size of the product permits, the identification shall be marked as indicated in 3.6.1.
When identification marking of the product is impractical, the unit package shall show the
compound number and manufacturer in addition to those markings specified in 5.1. Temporary
marking of O-rings for the manufacturer's identification shall be permitted at the time of
manufacture, but shall in no way affect the properties or function of the O-rings.
3.7 Workmanship
Workmanship shall conform to the best commercial practice for fluorosilicone elastomer rubber
products. Parts shall be smooth and free from flash. Parts, as received by purchaser, shall be
uniform in quality and condition, smooth, as free from foreign materials as commercially
practicable, and free from internal imperfections detrimental to the usage of the seals. Care
shall be taken during manufacturing, inspection and packaging to prevent contamination.
Labeling and traceability shall follow the parts throughout the manufacturing, inspection and
packaging processes.
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