Refine Your Search

Topic

Search Results

Standard

Suitable Test Sizes for O-ring Specifications

2021-09-08
CURRENT
ARP3050A
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

Rubber, Ethylene-Propylene, Hydrazine Resistant

2021-07-21
WIP
AMSR83412B
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.
Standard

Required O-ring Sizes for Quality Conformance Testing

2021-06-10
CURRENT
AS6837
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.
Standard

Rubber: Vinyl-Methyl Silicone (VMQ) Hot Air Resistant Low Compression Set, 70 to 80 Type A Hardness for Seals in Hot Air Systems

2021-05-19
CURRENT
AMS7267H
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.
Standard

Fluorosilicone (FVMQ) Rubber Fuel and Oil Resistant 35 – 45

2021-05-12
WIP
AMS3328D
This specification covers a fluorosilicone (FVMQ) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification is not recommended for use in the manufacture of O-rings, O-ring Cord, or Molded in Place gaskets. For the manufacture of O-rings, O-ring Cord, or Molded in Place gasketsthe use of AMS-R-25988, Type I, Class 1, Grade 40 is recommended.
Standard

Elastomer: Methyl Phenyl Vinyl Silicone Rubber (PVMQ) Extreme Low-Temperature Resistant 15 - 30 Type A Hardness

2021-03-10
CURRENT
AMS3332G
This specification covers an extreme low-temperature-resistant Methyl Phenyl Vinyl Silicone(PVMQ) elastomer that can be used to manufacture product in the form of sheet, strip, extrusions, and molded shapes. For molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications, use the AMS7XXX specification.
Standard

Designing with Elastomers for use at Low Temperatures, Near or Below Glass Transition

2020-11-12
WIP
AIR1387E

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: Nitrile Rubber (NBR), Diester Synthetic Oil Resistant, Sheets, 65 to 75 Type A Hardness, For Products In Engine Oil Systems

2020-09-29
WIP
AMS3786
This material has resistance to diester synthetic oils, but usage is not limited to such applications. This material may not be suitable for use in polyol ester based turbine oils. This material has a typical service temperature range of -65 to 250°F (-54 to 121°C). The service temperature range of the material is a general temperature range, but the presence of particular fluids and specific design requirements may modify this range. Each application should be considered separately. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used.
Standard

Elastomer: Nitrile Rubber (NBR), Diester Synthetic Oil Resistant, Compression Seals, 65 to 75 Type A Hardness, For Products In Engine Oil Systems

2020-09-29
WIP
AMS7289
This specification covers a synthetic rubber material in the form of molded rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. This material has resistance to diester synthetic oils, but usage is not limited to such applications. This material may not be suitable for use in polyol ester based turbine oils. This material has a typical service temperature range of -65 to 250°F (-54 to 121°C). The service temperature range of the material is a general temperature range, but the presence of particular fluids and specific design requirements may modify this range. Each application should be considered separately. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used
Standard

Fluorocarbon Elastomer (FKM) High Temperature / HTS Oil Resistant / Fuel Resistant Low Compression Set / 70 to 80 Hardness, Low Temperature Tg -22 °F (-30 °C) For Seals in Oil / Fuel / Specific Hydraulic Systems

2020-06-10
WIP
AMS7287A
This specification covers a high temperature, compression set and fluid resistant fluorocarbon (FKM) elastomer in the form, of O-rings, compression seals, O-ring cord, and molded-in-place gaskets for aeronautical and aerospace applications. These products have been used in contact with air and a wide variety of fuels, lubricants, specific hydraulic fluids, and a variety of gas turbine engine lubricants, including higher thermo-oxidative stability (HTS) lubricants, including those conforming to MIL-PRF-23699 Class HTS, MIL-PRF-7808 Grade 4 and AS5780 Class HPC, however usage is not limited to such applications. This material type has a typical service temperature range of -40 to +400 °F (-40 to +204 °C). These products are not suitable for use in phosphate ester based hydraulic fluids. Each application should be considered individually.
X