Neoprene CR
(Chloroprene polymer)
| General Notes: 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 |
Resistant to: Moderate chemicals and acids, ozone, oils, fats, greases,
many oils, and solvents.
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 applicants.
Attacked by: Strong oxidizing acids, esters, ketones,
chlorinated, aromatic and nitro hydrocarbons.
Poor resistance to degreaser solvents.
Content levels of neoprene can vary widely.
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Hypalon®
CSM
(Chlorosulfonated polyethylene)
General Notes: Tear resistance is fair. Fair
resistance to ketones and others.
Resistant to: Resists corrosive chemicals. Good oil resistance, ozone resistance,
heat resistance and weathering resistance. Similar to
Neoprene with improved acid and ozone resistance
Attacked by: Poor resistance to aldehydes, aromatic
solvents. esters, and cholorinated solvents. Concentrated
oxidizing acids, esters, ketones, chlorinated, aromatic and
nitro hydrocarbons.
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EPDM, EPM
(Ethylene Propylene copolymer and
terpolymer)
Resistant to: Water, steam and brake fluids.
Excellent resistance to ozone, sunlight and oxygen.
Excellent resistance to acid, alkali and ketones. Excellent
heat resistance and aging.
Attacked by: Mineral oils and solvents, aromatic
hydrocarbons. Poor resistance to fuels, oils and alcohols.
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Isoprene (IR)
Similar to natural rubber.
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Nitrile NBR
(Butadiene, Acrylonitrile copolymer)
| General Notes: 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) |
Resistant to: Resistant to a broader range of
aromatic hydrocarbons than neoprene. Resists many
hydrocarbons, fats, oils, greases, solvents, fuels and
hydraulic fluids, chemicals. Nitrile may be blended with SBR
rubber to achieve an economically priced sheet or moderately
oil resistant applications.
Attacked by: Ozone, ketones, esters, aldehydes,
chlorinated and nitro hydrocarbons.
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Natural
Rubber
Isoprene
NR, IR
(Polyisoprene)
General Notes: 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.
Resistant to: Most moderate wet or dry chemicals,
organic acids, alcohols, ketones, aldehydes.
Attacked by: Deteriorates when exposed to oils, fuels,
solvents, hydraulic fluids strong acids, fats, oils,
greases, most hydrocarbons. Poor resistance to sunlight,
ozone and oxygen.
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Silicone
Si, VMQ
(Organic silicone polymer)
General Notes: Excellent weathering properties and
resists ozone and oxygen attacks. Long service life can be
expected at 200°F. to 400°F.
Physical properties (tensile, abrasion,
tear and cut growth) are fair.
Resistant to: Excellent properties for both hot and
cold temperature extremes. Moderate or oxidizing chemicals,
ozone, concentrated sodium hydroxide
Attacked by: Poor resistance to solvents, oils,
fuels and hydrocarbons. Fair performance when exposed to
concentrated acids, alkalis, solvents, dilute sodium
hydroxide.
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Butyl
IIR
(Isobutylene, Isoprene, polymer)
General Notes: Excellent electrical resistance. Low
permeability to air.
Cold weather properties are fair.
Resistant to: Excellent resistance to acid and
alkali. Excellent weathering properties and heat resistance.
Water and steam.
Attacked by: Poor resistance fuels, oil, petroleum
solvents, coal, tar, solvents, aromatic hydrocarbons.
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Fluoroelastomer
(Standard fluorocarbon dipolymer 66%
fluorine)
General Notes: High cost of flouoroelastomer 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.
Resistant to: All aliphatic, aromatic and halogenated
hydrocarbons, acids, animal and vegetable oils.
Attacked by: Ketones, low molecular weight esters and
alcohols and nitro-containing compounds.
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SBR
Styrene-Butadiene , BR
(Styrene, Butadiene Copolymer,
Polybutadiene)
General Notes: 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.
Resistant to: Good abrasion resistance and excellent
impact and cut-and-gouged resistance. Similar to natural
rubber.
Attacked by: Similar to natural rubber.
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