SAE J 200 Codes FC, FE, GE
Relative Cost Medium-high
-60°~225°C Special Compound -100°~300°C
-76°~437°F Special Compound -150°~572°F
Seals (static) for extreme temperautre applications
Performs Well in…
Engine and trasmission oil (miniral oils)
Animal and vegetable oil and grease
Brake fluid (non-petroleum based)
Fire-resistant hydraulic fluid, HFD-R and HFD-S
High molecular weight chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for transformers)
Diluted salt solutions
Ozone, aging and weathering
Doesn’t Perform Well in…
Concentrated acids and alkalis
Steam over 120°C
Petroleum oils and fuel
Physically, silicones are based on silicone, an element derived from quarts. To create this class of synthetic elastomers, pendant organic groups such as methyl, phenyl, and vinyl must be attached to silicone atoms. The different additions of side chains can achieve significant variations in properties.
Extreme temperature range and low temperature flexibility are characteristics of silicone compounds. Retention of silicone at high temperature is superior to most other elastic materials. It is suitable for use in static seals in extreme temperature situations.
Silicone compounds are very clean and are used in many food and medical applications because they do not impart odor, taste, or toxic.
Excellent extreme temperature properties
Excellent compression set resistance
Very clean, low odor and taste
Typically not good for dynamic seals due to poor tensile strength, tear resistance, and abrasion resistance. Special compounds have been but their strength does not compare to conventional rubber.