| ASTM
DESIGNATION
D-1418-79 |
COMMON NAME |
GENERAL PROPERTIES |
| ABR |
Acrylic |
+ Excellent
resistance to high temperature, oil and air, ozone, and weathering.
- Poor low temperature properties. Not
recommended for water service. |
| AFMU |
Teflon,
Kel-F |
+ Excellent
chemical resistance. Excellent high and low temperature
properties. |
| AU |
Urethane |
+ Good aging
and excellent abrasion, tear, and solvent resistance.
- Poor high temperature properties. |
| BR |
Butadiene
rubber |
+ Excellent
abrasion resistance and low temperature properties. High
resilience |
| CPE |
Chlorinated-
polyethylene |
+ Excellent
ozone and weathering resistance; good heat resistance. Moderate
resistance to petroleum-based fluids. |
| CR |
Neoprene
(Chloroprene) |
+ Good oil and
petroleum based solvent resistance. Good weathering and ozone
resistance. Neoprene may be blended with SBR rubber to achieve an
economically priced sheet for moderately oil resistant
applications.
- 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 (e.g. oil swell) |
| CSM |
Hypalonâ (a registered Trademark of
DuPont) |
+ 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 chlorinated solvents. Fair resistance
to ketones and ethers. |
| ECO |
Hydrin,
Herchlor |
+ Good low
temperature properties. Excellent oil and ozone resistance. Fair
flame resistance.
- Low permeability to gases. |
| EPDM |
Ethylenepropylene
-
diene |
+ 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.
|
| FPM |
VITONâ fluoroelastomer,
a registered trademark of DuPont |
+ 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. |
| IIR |
Butyl
(Isobutene-Isoprene) |
+ Excellent
resistance to acid and alkali. Excellent weathering properties and
heat resistance. Excellent electrical resistance. Low permeability
to air.
- Poor resistance to fuels, solvents, oil and hydrocarbons.
Cold weather properties are fair. |
| IR |
Isoprene
(synthetic) |
Similar to
natural rubber |
| NBR |
Nitrile
(butadiene-acrylo-nitrile) based |
+ Excellent
resistance to oils, solvents and fuels. Resistant to a broader range
of aromatic hydrocarbons than neoprene. Nitrite may be blended with
SBR rubber to achieve an economically priced sheet for 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) |
| NR |
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 its
high abrasion resistance and resilience.
- Deteriorates when exposed to oils, fuels, solvents, and
hydraulic fluids. Poor resistance to sunlight, ozone and oxygen.
|
| Q |
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.
|
| SBR |
Styrene-butadiene |
+ Good
abrasion resistance and excellent impact and cut-and-gouge
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 hydrolic
fluids.
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