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Home > Elastomers > Material Specifications 3
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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