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Standard

Suitable Test Sizes for O-ring Specifications
2007-02-21
HISTORICAL
ARP3050
There are many tests that have been developed to characterize rubber O-rings. Many of these tests are independent of the size of the O-ring being tested. However, there are some tests, specifically, stress/strain properties, that are a function of the O-ring’s size. The purpose of this report is to provide guidelines for specifying O-rings that would be considered “suitable for testing” when writing O-ring material specifications.
Standard

Static Seal Test Fixture and Procedure
2019-11-05
CURRENT
AS7982
This SAE Aerospace Standard (AS) provides dimensions and procedures for a standardized test fixture used to evaluate the static performance of O-rings and other seal types in glands per AS4716 and AS5857.
Standard

Designing with Elastomers for Use at Low Temperatures, Near or Below Glass Transition
2003-12-30
HISTORICAL
AIR1387C
To ensure success in design of elastomeric parts for use at low temperature, the design engineer must understand the peculiar properties of rubber materials at these temperatures. There are no static applications of rubber. The Gaussian theory of rubber elasticity demonstrates that the elastic characteristic of rubber is due to approximately 15% internal energy and the balance, 85%, is entropy change. In other words, when an elastomer is deformed, the elastomer chain network is forced to rearrange its configuration thereby storing energy through entropy change. Thermodynamically, this means that rubber elasticity is time and temperature dependent (Reference 25). The purpose of this report is to provide guidance on low temperature properties of rubber with the terminology, test methods, and mathematical models applicable to rubber, and to present some practical experience.
Standard

Elastomer: Acrylonitrile Butadiene Rubber (NBR) Hot Oil and Coolant Resistant, Low Swell 45 to 55 Type ‘A’ Durometer Hardness for Products in Engine Oil Systems/Coolant Systems
2020-05-05
CURRENT
AMS3226J
This specification covers an Acrylonitrile Butadiene Rubber (NBR) that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. For molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, use the AMS7000 series specification.
Standard

Elastomer: Phenyl Methyl Vinyl Silicone (PVMQ) Low Temperature/Engine Oil Resistant High Strength/High Tear 55 to 65 Type “A” Hardness For Products in Aircraft Piston Engine Oil/Low Temperature Environments
2019-10-24
CURRENT
AMS3346H
This specification covers a phenyl vinyl silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, molded shapes, and extrusions. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
Standard

Elastomer: Methyl/Methyl Vinyl Silicone (MQ/VMQ) High Temperature Resistant High Strength/Tear Resistant 45 to 55 Type ‘A’ Durometer Hardness
2020-05-26
CURRENT
AMS3347D
This specification covers a methyl or methyl vinyl silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. For molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications, use the AMS7000 series specification.
Standard

Rubber, Silicone 1200 psi (8.27 MPa), High Modulus 45 – 55
2014-05-08
HISTORICAL
AMS3347C
This specification covers a silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used to address products such as O-rings, compression seals, O-ring cord, and molded-in-place gaskets.
Standard

Elastomer: Silicone, Rubber (MQ/VMQ) General Purpose 55 - 65 Durometer Type "A" Hardness
2019-02-27
CURRENT
AMS3303L
This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
Standard

Elastomer: Silicone Rubber, (VMQ) General Purpose 75 – 85 Durometer Type ‘A’ Hardness
2019-04-05
CURRENT
AMS3305K
This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
Standard

Elastomer: Silicone, Rubber (MQ/VMQ) General Purpose 65 – 75 Durometer Type ‘A’ Hardness
2019-04-05
CURRENT
AMS3304J
This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, AMS7268 should be used.
Standard

Elastomer: Silicone Rubber (MQ/VMQ) General Purpose 45 - 55 Durometer Type “A” Hardness
2019-02-28
CURRENT
AMS3302J
This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
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