Elastomere

NBR

NBR = Nitrile Butadien Rubber
Synthetic rubber
(synonyms Perbunan^® or Buna-N^®)

• Used with O-rings and diaphragms
• Good resistance against fuels and oils
• Not resistant against solvents

EPDM

EPDM = Ethylene Propylene Diene Monomer
Synthetic rubber

• Used with O-rings and diaphragms
• Good resistance against alkalis
• Not resistant against fuels, oils or solvents

FKM

FKM = Fluoroelastomer (“fluorine caoutchouc” type methylene)
(Synonyms FPM, Viton^® or Tecnoflon^®)

• Used with O-rings and diaphragm
• Good resistance against alkalis
• Widely-used seal material

FFKM

FFKM = Perflurorubber type M
(Synonyms Kalrez^® or Simraz^®)

• Used with O-rings
• Very good resistance against acids and alkalis (similar to PTFE)
• Very expensive (factor 10-14 compared to FKM)

FEP

FEP = Fluorinated ethylene propylene
Fluorocarbon

• Used with O-rings
• Very good resistance against acids and alkalis (similar to PTFE)
• Not very flexible

CR

CR = Chloroprene rubber type R
(Synonyms Neoprene^® or Chloroprene^®)

• Used with diaphragms
• Good resistance against oils
• Very flexible

PP-EPDM

PP-EPDM = Polypropylene-EPDM-Copolymer
(Synonym Santoprene^®)

• Used with diaphragms
• Combines the characteristics of PP and EPDM
• Good resistance against alkalis
• Do not use with oils