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Material Specifications
Part 3

Other Specifications

Other standards exist for the purpose of classifying and specifying elastomers for specific applications or environments. Among these standards are the Society of Automotive Engineers (SAE), and many governmental agencies, including the military. SAE J120a “Rubber Rings for Automotive Applications” is a recommended practice for the design and specification for static and dynamic, 70 Shore A hardness seals. Materials are classified and may be marked as:

  • Class I— Oil-resistant service (yellow-colored stripe), or,
  • Class II— Gasoline-resistant service (red-colored stripe)

The following table highlights several key Aerospace Material Specifications (AMS), Military (MIL), and National Sanitation Foundation (NSF) standards. These standards cover a wide range of sealing applications and materials. Many of these standards require independent or accredited laboratory certification of the materials. In some instances, Underwriter’s Laboratory (UL) approval is required.

Specification
Duro
Polymer
Thermal (°F)
Description
ISC Cpd
AMS 3301 40 Silicone –85 to 400° General Purpose S40
AMS 3302 50 Silicone –85 to 400° General Purpose S50
AMS 3303 60 Silicone –85 to 400° General Purpose S60
AMS 3304 70 Silicone –85 to 400° General Purpose S70
AMS 3305 80 Silicone –85 to 400° General Purpose S80
AMS 3307 70 Silicone   Low Compression Set, Non-Oil Resistant S70
AMS 3326 60 Fluorosilicone   Fuel & Oil Resistant F60
AMS 3357 70 Silicone   Lubricating Oil & Compression Set Resistant S70
AMS 7257 75 Perfluoro   High Temperature Z7257
AMS 7259 90 Fluorocarbon     V90
AMS 7268 70 Silicone   High Temperature & Low Compression Set S310
AMS 7276 75 Fluorocarbon   High Temp. Fluid, Very Low Compression Set V75
MIL-R-25988
Class 1, Grade 60
60 Fluorosilicone –90 to 350° Oil & Fuel Resistant F60
MIL-R-25988
Class 1, Grade 70
70 Fluorosilicone –90 to 350° Oil & Fuel Resistant F70
MIL-R-25988
Class 1, Grade 80
80 Fluorosilicone –90 to 350° Oil & Fuel Resistant F80
MIL-R-83248
Type 1, Class 1
75 Fluorocarbon –20 to 400° High Temperature, Fluid & Compression Set V75
MIL-R-83248
Type 1, Class 2
90 Fluorocarbon –20 to 400° High Temperature, Fluid & Compression Set V90
ZZ-R-765
Class 2A & 2B Grade 40
40 Silicone –80 to 437° High Temperature & Low Compression Set S40
ZZ-R-765
Class 1A & 1B Grade 50
50 Silicone –103 to 437° Low Temperature & Low Compression Set S314
ZZ-R-765
Class 2A & 2B Grade 50
50 Silicone –80 to 437° High & Low Temp. & Low Compression Set S50
ZZ-R-765
Class 2A & 2B Grade 60
60 Silicone –80 to 437° Low Temperature & Low Compression Set S60
ZZ-R-765
Class 1A & 1B Grade 70
70 Silicone –103 to 437° Low Temperature & Low Compression Set S313
ZZ-R-765
Class 2A & 2B Grade 70
70 Silicone –80 to 437° High Temperature & Low Compression Set S70
ZZ-R-765
Class 1A & 1B Grade 80
80 Silicone –103 to 437° Low Temperature & Low Compression Set S80
ZZ-R-765
Class 2A & 2B Grade 80
80 Silicone –80 to 437° High Temperature & Low Compression Set S80

Certain semiconductor equipment manufacturers and wafer fabrication companies have begun to express an interest in developing relevant specifications for the semiconductor industry. A possible forum for this effort may come through the Standards Committee of the Semiconductor and Equipment Materials International (SEMI).

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