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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Class 1

(75 hardness)

Class 2

(90 hardness)

Original

Tensile strength, psi, min Elongation, %, min. Hardness, points

Specific, gravity

Temperature retraction, 10% (TR-10) °F, max.

Air age 70 hours @ 518°F ± 5°F Tensile strength decrease, %, max. Elongation decrease, %, max. Hardness change, points

Weight loss, %, max.

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

deflection, max.

Air age 336 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. Elongation decrease, %, max. Hardness change, points

Volume change, % Compression set, % of original

deflection, max.

Fuel age 70 hours @ 75°F ± 5°F in

ASTM Reference Fuel B (ASTM D471) Tensile strength decrease, %, max. Elongation decrease, %, max.

Hardness change, points

Volume change, %

1600

125

75 ± 5

As determined

+5

35

15

+10, -5

10

15

45

35

20

+0, -15

+1 to +25

20

20

20

±5

+0 to +5

1600

100

90 ± 5

As determined

+5

45

20

+10, -5

10

25

65

35

20

+0, -15

+1 to +25

25

20

20

±5

+0 to +5