MIL-DTL-83397B
3.3 Dimensions and tolerances. Dimensions and tolerances shall be as specified on the
drawing or in the contract or order.
3.4 Physical properties. Physical properties shall conform to the requirements specified in
Table I.
3.5 Identification of product. Where the size of the product permits, the identification shall be
on the product. The marking shall be applied by suitable means, using marking fluid that is not
deleterious to the polyurethane rubber. The marking shall not be obliterated by normal handling.
When identification marking of the product is impracticable, the unit package shall show the
identification. The identification shall show the specification number, the manufacturer, the
manufacturer's designation (compound number), hardness. and the cure date by quarter and
year.
Example: MIL-DTL-83397
The Delectable Rubber Company
Compound No. 1980
80 Hardness
Cure date 3Q77
TABLE I. Properties
PROPERTIES
REQUIREMENTS
Class 1
Class 2
80 Hardness
90 Hardness
Specific gravity *
As Determined
As Determined
Tensile strength, psi (MPa), min.
4000 (27.58)
4500 (31.03)
Elongation, %, min.
400
300
Hardness, Durometer "A", points
80 ± 5
90 ± 5
Tear strength, psi (MPa), min
250 (1.72)
400 (2.76)
Temperature retraction (TR-10) F (C), max.
-45 (-42.8)
-20 (-28.9)
After aging 22 ± .25 hours at 158 ± 2F (70 ±1C)
Compression set, % max.
35
35
After aging 7 days at 212 ± 2F (100 ± 1C)
Tensile strength change, %
± 20
± 20
Elongation change, %
± 20
± 30
Hardness change, Durometer "A", points
±5
±5
After aging 120 days at 160 ± 2F (71 ± 1C) and 95% Relative Humidity
Tensile strength change, %
± 25
± 25
Elongation change, %
± 20
± 20
Hardness change, Durometer "A", points
± 10
± 10
After aging 4 days at 180 ± 2F (82 ± 1C) over water (short term test)
Tensile strength change, %
± 20
± 20
Ultraviolet resistance
Tensile strength change, %
± 20
± 20
Elongation change, %
± 20
± 20
* The permissible variation in specific gravity during actual production from that value established
in preproduction tests shall be ± .02.
3
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