MIL-R-83248 Rubber, Fluorocarbon Elastomer, High Temperature, Fluid, And Compression Set Resistant S/S By Sae-Ams7276, Sae-Ams7259, Sae-Ams3216, And Sae-Ams3218This specification covers high temperature, compression set, and fluid resistant fluorocarbon elastomer sheets, strips, molded parts, an extruded shapes for aeronautical and aerospace applications.

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MIL-R-83248C

4.6   Inspection test methods

4.6.1   Physical properties tests.  Conformance with the rubber product properties shall be determined in accordance with the applicable test methods specified in table VIII.

TABLE VIII.  Physical properties tests

Characteristics                                                                        ASTM Method

Hardness                                                                                      D2240 (type A), D1414 (o-rings) Tensile strength and elongation

Type I                                                                                   D1414

Type II                                                                                  D412, (Use die C for oil aging)

Volume change                                                                            D471

Specific gravity                                                                           D297, hydrostatic method

Temperature retraction (TR-10)

Type I                                                                                   D1414

Type II                                                                                  D1329

4.6.2   Air aging at 518°F test.  Air aging shall be conducted in accordance with ASTM D573, except that the rubber shall be aged for 70 hours at 518°F ± 5°F.  Tensile strength, elongation, and hardness changes shall be determined as specified in 4.6.1.

4.6.2.1   Weight loss test.  The weight loss test shall be conducted on samples air-aged in accordance with 4.6.2.  Test specimens shall be conditioned for 24 hours in a desiccator before and after air-aging. The specimens shall be weighted immediately after the desiccation period before and after aging.   The percentage weight loss shall be calculated as

follows:

weight loss  =

where            W1  =  weight of sample before air-aging

W2  =  weight of sample after aging.

  W1   -  W2

W1

x  100

15

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