Technical Section
Material Properties Chart of Elastomers (Rubber)
 
International
Symbol
NR NBR CR FPM
FKM
TPE PUR
Brand Name (e.g.)   Perbunan® Neoprene® Viton® SANTOPRENE® Bayflex®
Chemical Name Natural rubber Acrylonitrile-butadiene rubber Chloroprene rubber Fluorine rubber
Fluorine caoutchouc
Thermoplastic rubber Polyurethane
Hardness
(Shore A)
30 - 90 25 - 95 30 - 90 65 - 90 55 - 87 65 - 90
Temperature resistance:  
short-term
- 60 to +130°C
-40 to +150°C
-30 to +150°C
-30 to +280°C
-40 to +150°C
-40 to +130°C
long-term
-40 to +80°C
-30 to +120°C
-20 to +120°C
-20 to +230°C
-30 to +125°C
-25 to +100°C
Tensile strength
[N/mm²]
--
25
25
20
8.5
20
Wear / Abrasion
Resistance
good
good
good
good
good
excellent
Resistance to:
Oil, grease
not suitable
outstanding
good
good
good
very good
Solvents
low
varies
varies
very good
outstanding
satisfactory
Acids
low
restricted
good
very good
outstanding
not suitable
Caustic solutions
low
good
very good
very good
outstanding
not suitable
Fuels
not suitable
good
slight
outstanding
good
good
General

NR is a material with very good physical properties and excellent mechanical strength. Use e.g. for spring elements.

Please note: natural rubber has a characteristic smell.

NBR is
a synthetic special rubber for rubber parts with high
requirements for resistance to swelling when in contact with oils and fuels.
Standard
material for
O-rings.

CR is
one of the most frequently used synthetic
rubbers with a wide range of applications for parts which require
exceptional resistance to aging, atmospheric and environmental influences.

FPM is
unmatched for applications with contact to fuels, oils, solvents, as well as many acids and caustic solutions;
resistant to atmospheric and
environmental influences.
Due to its high price its use is restricted to high quality rubber parts which are exposed to extremely heavy wear.
SANTOPRENE® is a technopolymer rubber, the
performance characteristics of which are
comparable to those of many customary
vulcanized
special rubbers.
SANTOPRENE® is a multi-purpose material with outstanding
dynamic fatigue life and excellent resistance to ozone and
atmospheric
influences (environmental influences).
PUR is known for exception-
ally good mechanical characteristics with very good resistance to atmospheric and environmental
influences.
In addition, the extreme
resistance to tearing and to wear should also be mentioned.

The characteristics described should be treated as guidelines only. No guarantee is made. The exact conditions of use have to be taken into account individually.