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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The following properties shall be determined on brown specimens that have been cut from 6 inches by 6 inches by 0.075 inch platen sheets and have been aged for 28 days at 77°F ± 2°F and 95 ± 3 percent relative humidity.

Class 1

(75 hardness)

Class 2

(90 hardness)

Properties

Tensile strength, psi, min

Elongation, %, min.

Tensile strength decrease, %, max. 1/ Elongation decrease, %, max. 1/

Air age 70 hours @ 518°F ± 5°F Tensile strength decrease, %, max. 2/ Elongation decrease, %, max. 2/

Air age 22 hours @ 392°F ± 5°F Compression set, % of original

deflection, max.

Oil age 70 hours @ 392°F ± 5°F in

ARM 200

Tensile strength decrease, %, max. 2/ Elongation decrease, %, max. 2/ Compression set, % of original deflection, max.

1600

125

15

15

35

25

15

35

20

15

1600

100

15

15

45

25

25

35

20

20