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SAE AMS-R-25988 1998 Edition, March 1, 1998
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Rubber, Fluorosilicone Elastomer, Oil-and-Fuel-Resistant, Sheets, Strips, Molded Parts, and Extruded Shapes
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1. SCOPE:

1.1 Scope:

This specification covers oil-and-fuel-resistant fluorosilicone elastomer rubber sheets, strips, molded parts, and extruded shapes for aeronautical and aerospace applications.

1.2 Classification:

The fluorosilicone elastomer rubber shall be of the following types, classes, and grades, as specified (see 6.2).

Type I--O-rings (available only in class 1, grades 60, 70, and 80 and class III, grade 75).

Type II--Molded parts (other than O-rings) sheets, strips, and extruded shapes.

Class 1--General purpose.

Grade 40--Nominal 40 type A durometer hardness, type II, only.

Grade 50--Nominal 50 type A durometer hardness, type II, only.

Grade 60--Nominal 60 type A durometer hardness, type I and II.

Grade 70--Nominal 70 type A durometer hardness, type I and II.

Grade 80--Nominal 80 type A durometer hardness, type I and II.

Class 2--High-strength general purpose, type II, only.

Class 3--High modulus, increased temperature resistance, type I and II.