MIL-R-83283 Rubber Silicone, High Strength, Cabin Pressure Seal Material, Diaphragm Type S/S By Sae-Ams-R-83283This specification covers 45 durometer hardness, high strength silicone rubber.

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MIL-R-83283A(USAF)

4.6 Inspection test methods

4.6.1  Physical properties tests.  Conformance with the physical properties shall be determined in accordance with the applicable test methods specified in table III.

TABLE III.  Physical properties tests.

Characteristics                                    ASTM Method

Tensile strength and elongation                   D 412

Hardness                                                      D 2240

Tear strength and tear                                  D 624 (use die B)

propagation

Tear propagation                                          D 813

Temperature retraction (TR-10)                   D 1329

Tension  1/                                                    D 412

Resilience, vertical impact                            D 2632

1/ The test specimen shall be held for 10 minutes at 300 percent elongation and be allowed 5 minutes for recovery prior to the tension set measurement.

4.6.2  Compression set test.  Compression set shall be determined in accordance with ASTM D 395, method B except that the aging time and temperature shall be in accordance with table I. Test specimens shall be plied up to obtain required thickness.

4.6.3  Air aging .  Air aging shall be conducted in accordance with ASTM D 573,  except that the aging time and temperature shall be in accordance with table I. Tensile

strength, elongation, and hardness changes shall be determined as specified (see

4.6.1).

4.6.3.1 Bend, flat test. Bend flat test shall be conducted by bending a sample 180 degrees flat upon itself, after being exposed to the air aging as specified (see table I).

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