Sealing materials
|
Name |
Silicone (VMQ silicone rubber) |
EPDM (ethylene-propylene-diene rubber) |
Viton (FPM fluorine rubber) |
Perbunan (NBR nitrile rubber) |
PTFE (polytetrafluoroethylene) |
|---|---|---|---|---|---|
| Operating temperature | stable in water up to 100 °C, possibility of steam sterilization briefly up to 120 °C to 130 °C |
continuous operating use from -40 °C to +140 °C, possibility of steam sterilization up to 130 °C |
continuous operating use from -20 °C to +200 °C, possibility of steam sterilization briefly up to 130 °C to 140 °C |
continuous operating use from -25 °C to +110 °C, possibility of steam sterilization briefly up to 130 °C |
physiologically safe up to +200 °C, operating range from -200 °C to +260 °C |
| Recommended use | high thermal load capacity good resistance to cold, well suited for food applications, dielectric properties good resistance to alcohols |
good resistance to swelling for: • diluted inorganic and organic acids, media, oxidizing media, alkalis and ketones • hot water and steam up to 130 °C |
good resistance to swelling for: • mineral oils • vegetable and animal oils • lubricants (including certain additives) • fuels |
good resistance to swelling for: • aliphatic hydrocarbons (such as propane, butane, petrol, mineral oil) • lubricants based on mineral oil |
good resistance to swelling in almost all parts smooth and repellent surface, no adhesion occurs chemical resistance superior to all other elastomers non-flammable material |
| Limited use (borderline) | exhibits high swelling for: • low-molecular esters and ethers • aliphatic and aromatic hydrocarbons • concentrated acids and alkalis |
Cannot be used for: • vegetable and animal oils • aliphatic, aromatic and chlorinated hydrocarbons • mineral oils |
exhibits high swelling for: • polar solvents such as acetone, methyl ketone, ethyl acetate, diethyl ether and dioxane • low-molecular organic acids (formic acid and acetic acid) • gaseous ammonia, amines and alkanes • superheated steam |
not resistant to: • polar solvents • chlorinated hydrocarbons • ketones • aromatic hydrocarbons (benzene) • esters |
not resistant to: • liquid alkali metals and certain fluorine compounds in combination with high pressure and temperature material does not exhibit rubber elasticity |