Materials & Resistance

A wide range of materials for every application

View the resistance chart

Materials

Elastomers

NBR

= Nitrile Butadiene Rubber
(synthetic rubber; also known as Perbunan^® or Buna-N^®)

Used in O-rings and diaphragms
Good resistance to fuels and oils
Not resistant to solvents

EPDM

= Ethylene Propylene Diene Monomer
(EPDM) Synthetic Rubber

Used in O-rings and membranes
Good resistance to alkalis
Not resistant to fuels, oils, or solvents

FKM

= Fluoroelastomer ("fluororubber," methylene type)
(synonyms: FPM, Viton^®, or Tecnoflon^®)

Used in O-rings and diaphragms
Good resistance to alkalis
Widely used sealing material

FFKM

= Perfluoroelastomer Type M
(also known as Kalrez^® or Simraz^®)
Fully fluorinated elastomer

Used in O-rings
Very good resistance to acids and alkalis (similar to PTFE)
Very expensive (10–14 times more expensive than FKM)

FEP

= Fluorinated ethylene propylene
fluorocarbon

Use in O-rings
Very good resistance to acids and alkalis (similar to PTFE)
Not very flexible

CR

= Chloroprene rubber Type R
(also known as Neoprene^® or Chloroprene^®)

Used in membranes
Good resistance to oils
Very flexible

PP-EPDM

= Polypropylene-EPDM copolymer
(also known as Santoprene^®)

Used in membranes
Combines the properties of PP and EPDM
Good resistance to alkalis
Do not use with oils

Plastics

PP

= Polypropylene
(synonym: Hostalen^®)

Used in pumps, housings, and fuel nozzles
Good resistance to aggressive media, acids, alkalis, and neutral, non-flammable liquids
Available as semi-finished products in the form of pipes and sheet material
Available as granules for injection molding
Weldable
Color: Gray for pumps
Operating temperature range up to approx. 50°–60° C

PVDF

= Polyvinylidene fluoride

Used in pumps and housings
Excellent resistance to strong acids and alkalis, as well as neutral, non-flammable liquids
Available as semi-finished products in the form of tubes and sheet material
Available as granules for injection molding
Weldable
Color: White, as with the pumps
Operating temperature range up to approx. 80° C
Twice as expensive as PP

PPS

= Polyphenylene sulfide
(also known as Ryton^®)

Used in the measuring chamber of the FMC 100 flowmeter
Used in the housings and oval wheels of the FMO flowmeter
Good resistance to acids and alkalis
High dimensional stability
High mechanical strength
Available as granules for injection molding

PTFE

= Polytetrafluoroethylene
(also known as Teflon^®)

Used in membranes, stators, and plain bearings
Excellent resistance to all liquids
Available as semi-finished products in tubes or sheet form
Easy to machine
Cannot be welded

PTFE / Carbon

= Polytetrafluoroethylene + 33% carbon
(synonym: Teflon^®)

Used in plain bearings and mechanical seals
Excellent resistance to all liquids
Electrically conductive

ETFE

= Ethylene
tetrafluoroethylene (synonym: Tefzel^®)

Used in the rotors and measuring chambers of the FMC flowmeter
Excellent resistance to all liquids
High dimensional stability
High mechanical strength
Available as granules for injection molding

POM

= Polyoxymethylene
(also known as Acetal^® or Delrin^®)

Used in housings for compressed-air diaphragm pumps
High dimensional stability
High mechanical stability
Easy to machine
Do not use with strong acids or oils
Electrically conductive

PA

= Polyamide
(also known as Nylon^® or Rilsan^®)

Used in FEM 4070 motor housings
High dimensional stability
High mechanical stability
High temperature stability

PE

= Polyethylene
(also known as Hostalen^® or Lupolen^®)

Used in the measuring chamber of the FMC 250 flowmeter
Good resistance to acids and alkalis
Easy to process
Available as granules for injection molding

Metals

S

= Stainless steel (1.4571)

Used in shafts, pumps, fuel nozzles, and housings
Used with highly flammable media, acids and alkalis, solvents, and in pharmaceutical and food applications
Weldable
Electrically conductive
Very commonly used in the chemical industry

HC

= Hastelloy C (2.4610)

Highly corrosion-resistant nickel-molybdenum alloy
Used in shafts and pumps
Used with strong acids and alkalis as well as highly aggressive media
Weldable
Electrically conductive
Very expensive (3.5 times more expensive than stainless steel for barrel pumps)

AL

= Aluminum (AlMg₅)

Used in pumps and fuel nozzles
Used primarily for oils (diesel, hydraulic oil), but also for neutral, non-flammable media
Weldable

Must no longer be used for highly flammable media, as an electrically non-conductive oxide layer may form on the surface of the pump!

GG

= Gray cast iron

Used in the housings of compressed air diaphragm pumps
High surface hardness
Specifically used for abrasive media

TI

= Titanium

Used in the shafts of barrel pumps
Good resistance to highly corrosive media
Used with hydrofluoric acid (HF) and ferric chloride (FeCl_₃) or when HC offers only limited resistance