Materials
Excellent Materials for Rubber Seal Products
Material Selection
The environment in which a seal will operate should be determined before selecting the sealing or lip material. It must consider the functions of the seal as follows:
Comparison Table
1 – Very good
2 – Good for most application
3 – Fair; can be used if other materials available but otherwise not recommended
4 – Not recommended
| Code | NR | SBR | EPDM | CR | NBR | ACM (PA) | SI | FPM |
|---|---|---|---|---|---|---|---|---|
| Properties\ Compound | Natural Rubber | Styrene-Butadiene Copolymer | Ethylene Propylene Rubber | Poly-chloroprene | Nitrile Rubber | Poly-acrylate | Silicone Rubber | Fluoro-Rubber (Viton) |
| Tensile | 1 | 2 | 3 | 1 | 1 | 4 | 4 | 1 |
| Durometer | 30–100 | 40–100 | 30–80 | 40–90 | 30 –100 | 40–90 | 30–90 | 55–90 |
| Rebound | 1 | 3 | 2 | 1 | 2 | 3 | 3 | 3 |
| Abrasion Resistance | 1 | 1 | 2 | 2 | 1 | 3 | 4 | 3 |
| Impact Strength | 1 | 1 | 2 | 1 | 2 | 4 | 4 | 3 |
| Gas Impermeability | 3 | 3 | 3 | 2 | 2 | 3 | 4 | 2 |
| Oxygen Resistance | 3 | 3 | 2 | 2 | 3 | 2 | 1 | 1 |
| Ozone Resistance | 4 | 4 | 1 | 2 | 4 | 2 | 1 | 1 |
| Weathering Resistance | 3 | 3 | 1 | 2 | 3 | 2 | 1 | 1 |
| Heat Resistance | 4 | 3 | 1 | 2 | 3 | 2 | 1 | 1 |
| Low Temperature | 2 | 3 | 2 | 3 | 3 | 4 | 1 | 2 |
| Water Resistance | 1 | 2 | 1 | 2 | 2 | 4 | 2 | 2 |
| Oil and Fuel Resistance | 4 | 4 | 4 | 2 | 1 | 1 | 3 | 1 |
| Animal, Vegetable Oil | 3 | 3 | 2 | 2 | 1 | 1 | 2 | 1 |
| Alcohol Resistance | 2 | 2 | 2 | 1 | 2 | 2 | 2 | 2 |
| Alkaline Resistance | 3 | 3 | 2 | 1 | 2 | 4 | 4 | 2 |
| Acid Resistance | 2 | 2 | 1 | 1 | 1 | 3 | 3 | 1 |
| Aliphatic Solvent | 4 | 4 | 4 | 2 | 1 | 1 | 4 | 1 |
| Aromatic Solvent | 4 | 4 | 4 | 2 | 1 | 1 | 4 | 1 |
| Oxygenated Solvent | 2 | 2 | 1 | 4 | 4 | 4 | 3 | 4 |
* Other materials like P.T.F.E, Butyl, Vamac, Felt, and Leather are also available for seals and other molded products
* Please contact TCK for your specific applications and requirements
Metal Case and Spring
The other major components of an oil seal are metal case and garter spring.
Case
| SAE. No. | AISI No. | Application | Cost |
|---|---|---|---|
| 1008~1010 | 1008~1010 | General | Low |
| SAE 30304 | 304 | Special Corrosion Resistance | High |
The metal case generally is produced from carbon steel for general applications in oil or grease. For special applications when sealing seawater for corrosive fluids for gases, stainless steel can be applied at an increase in price. Other metal cases such as aluminum and brass are available for your specific applications and requirements.
Spring
| SAE. No. | AISI No. | Application | Cost |
|---|---|---|---|
| 1070~1080 | 1070~10880 | General | Low |
| 30304 | 304 | Special Corrosion Resistance | High |
| C5210R | C5210 | Corrosion and Aging Resistance | Higher |
For the garter spring, piano wire is used for general applications. Where corrosion resistance or extreme heat resistance is required, stainless steel is available.
