Gaskets
The following charts show the abbreviations according to ISO 1629 and ASTM 1418, the temperature range, the chemical description, some trade names, essential qualities of those gasket materials normally used, as well as the compatibility with several media.
| Abbreviation | Temperature range | Chemical description | Trade names |
|---|---|---|---|
| NBR | -30 °C – 100 °C | Nitril-Butadien-Kautschuk Acrylonitrile-Butadiene-Elastomer |
Perbunan, Buna, Baypren, Hycar, Breon, Butakon |
| EPDM | -35 °C – 140 °C | Ethylen-Propylen-Dien-Kautschuk Ethylene-Propylene-Diene-Elastomer |
EPDM, Dutral, Keltan, Vistalon, Nordel, Epsyn |
| VMQ (MVQ) | -40 °C – 200 °C | Silikon-Kautschuk Silicone-Elastomer |
Silicone, Silastic, Silopren, Rhodorsil |
| FKM (FPM) | -20 °C – 200 °C | Fluor-Kautschuk Fluoro-Elastomer |
Viton, Fluorel, Tecnoflon, Noxtite, Dai El |
| PTFE | -200 °C – 260 °C | Polytetrafluorethylen Polytetraluoroethylene |
Teflon, Halon, Hostaflon, Algoflon, Fluon |
Material properties
Grading: 1 = very good, 2 = good, 3 = satisfying, 4 = sufficient, 5 = deficient, 6 = insufficient
| NBR | EPDM | VMQ | FKM | PTFE | |
|---|---|---|---|---|---|
| Aging resistance | 3 | 1 | 1 | 1 | 1 |
| Ozone resistance | 3 | 1 | 1 | 1 | 1 |
| Petrol resistance | 1 | 5 | 5 | 1 | 1 |
| Oil and fat resistance | 1 | 4 | 1 | 1 | 1 |
| Acid resistance | 4 | 1 | 5 | 1 | 1 |
| Alkali resistance | 3 | 2 | 5 | 1 | 1 |
| High temp. water res. | 3 | 2 | 5 | 2 | 1 |
| Steam resistance | 6 | 1 | 4 | 6 | 2 |
| Gas impermeability | 3 | 2 | 2 | 2 | 5 |
| Abrasion resistance | 2 | 3 | 5 | 4 | 3 |
| Electric resistance | 4 | 2 | 1 | 4 | 1 |
| Qualified for | Not qualified for | |
|---|---|---|
| NBR | Aliphatic hydrocarbons, for example propane, butane, mineral oil, fats, fuel, inorganic acids, bases of less concentration |
Chlorinated and aromatic hydrocarbons, oxydising media, solvents, ester, ketones |
| EPDM | Wash bases, acids, alkaline media, organic media, ketones, brake fluid, chlorine, ester, glycol, sodium, phosphates, soda |
Aliphatic, aromatic and chlorinated hydrocarbons, silicones containing oils and fats (strong swelling) |
| VMQ (MYQ) | Gases, hot air, oxygen, vegetable and animal oils and fats, condiments, hydraulic fluid, brake fluid | Hot water, steam |
| FKM (FPM) | Mineral oil, fats, fuel, aliphatic and aromatic hydrocarbons, solvents, weak alkalies, many chemicals | Solvents, ketones, brake fluid |
| PTFE | Almost all chemicals | Liquid alkali metals, several fluoride and methyl compounds at high pressure and high temperature, sulfur trioxide |