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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