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This specification provides requirements for the identification and packaging of sheet, strip, extrusions, and molded parts made of natural rubber, synthetic rubber, reclaimed rubber, and combinations of the above with other materials such as asbestos, cork, and fabrics. AMS2817 covers preferred requirements for identification and packaging of preformed packings.

This specification covers a chloroprene (CR) rubber that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes such as window channels, bumper pads, chafing strips, etc. For molded rings, compression seals, molded O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, use the equivalent AMS7XXX specification.

This specification covers a chloroprene rubber (CR) that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes such as window channels, bumper pads, chafing strips, etc. For molded rings, compression seals, molded O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, use the equivalent AMS7XXX specification.

This specification covers a standard chloroprene (CR) rubber stock in the form of molded test slabs.

This specification covers three types of rubber having good resistance to high and low temperature and hydrazine type propellants, but poor resistance to hydrocarbon oils or solvents. Hydrazines are hazardous chemicals. See Dangerous Properties of Industrial Materials; by N. Irving Sax.

The purpose of this document is to specify the O-ring sizes that are suitable for quality conformance testing (limited to hardness, tensile tests, compression set, specific gravity, and volume swell per ASTM D1414) required by AMS-7xxx series of specifications. In addition, suppliers and/or users, at their own discretion and/or according to their procurement documents, may choose to invoke this specification for procurement or other purposes for O-ring sizes that are not covered by AS568. If additional tests are specified as quality conformance tests in any AMS-7xxx specification, then that specification shall also specify the required test size for that additional test. This document does not address O-ring size for qualification testing required by AMS-7xxx series of specifications since that is already specified in the AMS-7xxx specification. This document only covers O-ring sizes required by test type. These O-ring sizes include, but are not limited to, AS568-xxx O-ring sizes.

This specification covers a silicone (VMQ) rubber in the form of molded rings. These rings have been used typically as sealing rings for service from -65 to +260 °C (-85 to +500 °F) in contact with air, but usage is not limited to such applications. The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness.

This specification covers an acrylonitrile-butadiene (NBR) rubber in the form of molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. For sheet, strip, tubing, extrusions, and molded shapes, use the AMS3XXX specification which is intended for that use.

This SAE Aerospace Information Report (AIR) provides a general description of methods for hardness testing of O-rings including factors which affect precision and comparison of results with those obtained in standard tests.

This specification covers a fluorocarbon (FKM) rubber stock in the form of molded test slabs.

This specification covers metallic-encased gaskets with and without inlays.

This specification covers 45 durometer hardness, high strength silicone rubber.

This SAE Aerospace Information Report (AIR) provides a general description of methods for hardness testing of O-Rings including factors which affect precision and comparison of results with those obtained in standard tests.

This specification covers two grades of ethylene-propylene rubber having excellent resistance to ozone and hot water, but poor resistance to hydrocarbon oils or solvents.

This specification covers three types of rubber having good resistance to high and low temperature and hydrazine type propellants, but poor resistance to hydrocarbon oils or solvents. Hydrazines are hazardous chemicals. See “Dangerous Properties of Industrial Materials” by N. Irving Sax.

This specification covers a fuel and low-temperature resistant butadiene-acrylonitrile (NBR) rubber in the form of molded rings.

This specification establishes the requirements for fabricated products of vulcanized rubber, synthetic rubber or rubberlike compositions alone or in combination, together with procedures for the inspection of such products (see 6.1).

This specification covers vulcanized sheet made of granulated cork uniformly dispersed in a synthetic rubber compound, for use in gaskets where aromatic fuel or oil resistance is required (see 6.1).

This standard establishes the inspection requirements and acceptance standards for optimum surface finish O-ring packings and gaskets. (This is not an O-ring specification per se.)

The information presented herein describes the commonly observed patterns of O-ring failure by means of both text and illustration. Possible causes and corrective actions are indicated for alleviating the problem.