ZZ-R-768B
ASTM D624 - Standard Test Method for - Tear Strength of Conventional Vulcanized
Rubber and Thermoplastic Elastomers (DoD adopted)
ASTM D792 - Standard Test Methods for Density and Specific Gravity (Relative
Density) of Plastics by Displacement (DoD adopted)
ASTM D945 - Standard Test Methods for Rubber Properties in Compression or Shear
(Mechanical Oscillograph) (DoD adopted)
ASTM D1229 - Standard Test Method for Rubber Property - Compression Set at Low
Temperature (DoD adopted)
ASTM D2240 - Standard Test Methods for Rubber Property - Durometer Hardness (DoD
adopted)
(Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., P.O. Box C700, West
Conshohocken, PA 19428-2959 or online at www.astm.org.)
3. REQUIREMENTS
3.1 First article. When specified (see 3.1.1 and 6.2), a sample shall be subjected to first article inspection in accordance with 4.3.
3.1.1 First article inspection. First article inspection shall be performed when one or more of the following apply:
a. Upon initial offering of a material to the government by the vendor.
b. When any change in material formulation is made from previous first article test samples.
c. When any change in manufacturing processes or conditions are made from previous first article test samples.
d. When the product being offered is manufactured at a plant different than that of previous first article test samples.
e. When required by the Naval Sea Systems Command.
3.2 Material. The material shall be a synthetic rubber compound using a copolymer product of butadiene and acrylonitrile which meets the requirements of 3.4 when cured.
3.2.1 Uncured compound. Uncured compound shall be furnished in sheet form ranging in size from 2 feet to 3 feet wide, by 3 feet to 6 feet in length, and ΒΌ inch to 1 inch thick.
3.2.2 Recovered materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).
3.3 Type, dimensions, and tolerances of resilient components. The type, dimensions, and tolerances of resilient components shall be as specified in the contract or purchase order (see 6.2).
3.4 Physical requirements. The cured rubber shall conform to the requirements specified in table I.
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