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NEOPRENE
Considered a good choice for general purposes applications.
It has good mechanical properties, good chemical resistance and
high resilience. Neoprene is a workhorse in the industry. It is
used on nip rolls, pull rolls, feed rolls and in flexo and gravure
printing.
NITRILE
Also known as NBR or Buna-N, Nitrile is the most
commonly used elastomer in the industry. It has good resistance
to oils, chemicals and water. Nitrile is also a workhorse covering
with applications as nip rolls, pull rolls and rolls in printing
applications. Carbonxilated Nitrile is a modified Nitrile rubber,
possessing most of the properties of Nitrile along with outstanding
abrasion resistance and other physical characteristics, including
tensile strength. Nitrile/PVC blends are also very popular in the
web converting industry. The addition of PVC enhances the physical
properties, abrasion resistance, strength, chemical and ozone resistance
of Nitrile.
POLYURETHANE
Urethane rubber is available in two basic chemical
types, polyester and polyether. Polyester urethane is a tough elastomer
with good chemical and solvent resistance while Polyethers work
better in applications that come in contact with water. Urethane
is typically used in applications where toughness, wear resistance
and cut resistance are desired. Urethane generally has high-friction
characteristics making it a favorite for pull rolls.
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SILICONE
Silicone rubber is known for two main attributes,
high temperature (500° F) capability and imporved relesase characteristics.
Silicone is a more expensive covering but along with heat resistance
and release it has good chemical resistance and excellent ozone
resistance. Silicone has generally weak physical characteristics
but is widely applied in situations where its temperature and release
characteristics are needed.
EPDM
Sometimes called EPT, EPDM consists mostly of Ethylene
and Propylene. It has excellent ozone resistance and chemical resistance,
especially with polar solvents such as keytones. EPDM is also heat
resistant to 350° F. It is typically used where its chemical
and temperature capabilities are required such as coating applications.
HYPALON
Hypalon has good physical characteristics, good chemical
resistance, excellent ozone resistance and good temperature (350°
F) capability. Hypalon is ideal for many roller applications and
is a favorite as a covering for nip rolls.
VITON
Viton
Is known for its excellent chemical resistance and
high temperature (500 F) capability. Viton is very expensive so
its applications are limited to extreme cases where other compounds
fail and the high price can be justified. |
