|
Compound
|
|
|
Neoprene ( CR) |
+
Good oil and petroleum base solvent resistance. Good weathering and
ozone resistance. Neoprene may be blended with SBR rubber to achieve an
economically priced sheet for moderately oil resistant applicants.
- Poor resistance
to degreaser solvents. Content levels of neoprene can vary widely.
Application problems may occur when using blended or commercial grades
of neoprene sheet of unknown quality levels in contact with oil,
solvents and fuels. Where high oil or fuel resistance is required, the
fabricator and user need to specify one of the following
an ASTM call-out
a military
specification
an ASTM-specified
oil resistance level based on an ASTM test |
|
CSM |
+
Good oil resistance, ozone resistance, heat resistance and weathering
resistance. Resists corrosive chemicals.
- Tear resistance is
fair. Poor resistance to aldehydes, aromatic solvents. esters, and
cholorinated solvents. Fair resistance to ketones and others. |
|
EPDM |
+
Excellent resistance to ozone, sunlight and oxygen. Excellent resistance
to acid, alkali and ketones. Excellent heat resistance and aging.
- Poor resistance
to fuels, oils and alcohols. |
|
Isoprene (IR) |
Similar to natural rubber
|
|
Nitrile (NBR) |
+
Excellent resistance to oils, solvents and fuels. Resistant to a broader
range of aromatic hydrocarbons than neoprene. Nitrile may be blended
with SBR rubber to achieve an economically priced sheet or moderately
oil resistant applications.
- Application
problems may occur when using Nitrite of unknown quality levels in
extreme oil-resistance applications or in contact with fuels and
solvents. Content levels of nitrite can vary widely. Where oil or fuel
resistance is required, the fabricator and user need to specify one of
the following:
an ASTM call-out
a military
specification
an ASTM-specified
oil-resistance level based on an ASTM test (e.g. oil swell) |
|
Natural Rubber |
+
Good gasket material due to excellent physical properties such as
resilience, tear strength and wear resistance. Natural rubber is used
effectively as sand and shot blast curtain material because of it's high
abrasion resistance and resilience.
- Deteriorates
when exposed to oils, fuels, solvents, and hydraulic fluids. Poor
resistance to sunlight, ozone and oxygen. |
|
Silicone |
+
Excellent properties for both hot and cold temperature extremes.
Excellent weathering properties and resists ozone and oxygen attack.
Long service life can be expected at 200°F. to 400°F.
- Poor resistance
to oils, fuels and hydrocarbons. Fair performance when exposed to acids,
alkalis and solvents. Physical properties (tensile, abrasion, tear and
cut growth) are fair. |
|
Butyl |
+
Excellent resistance to acid and alkali. Excellent weathering properties
and heat resistance. Excellent electrical resistance. Low permeability
to air.
- Poor resistance
fuels, solvents, oil and hydrocarbons. Cold weather properties are fair.
|
|
Fluoroelastomer |
+
Excellent resistance to heat and oil combinations hot greases found in
engines and compressors. Excellent resistance to a wide range of
concentrated acids.
- High cost of
fluoroelastomer may limit usage to extreme applications. Resilience is
low and tear strength is limited unless certain compounding steps are
taken to improve it. Impact resistance is fair. |
|
Styrene-Butadiene(SBR) |
+
Good abrasion resistance and excellent impact and cut-and-gouged
resistance. Can be compounded for use as skirtboard rubber, lining
rubber, conveyor belt covers, tires and other extremely demanding
applications. Used as gasket material and as an economical general
purpose sheet.
- Not suited for
use with oils, fuels. solvents, or hydraulic fluids. |
