Chemical Guide
Chemical Guide
The chemical guide in this section is offered as a general indication of the compatibility of the various materials used in the hose with the chemicals and fluids listed . The basis for the ratings in this guide includes actual service experience , the advice of various polymer suppliers , and the considered opinion of our rubber chemists . When in doubt , a sample of the compound should always be tested with the particular chemical it is to handle . Some of the variables that come into play in the resistance of a compound to chemical attack are :
1 . Temperature of the Material Transmitted :
Higher temperatures increase the effect of chemicals on rubber compounds . The increase varies with the polymer and the chemical . A compound quite suitable at room temperature might fail very quickly at higher temperatures .
2 . Service Conditions :
A rubber compound usually swells when exposed to a chemical . With a given percent of swell , a hose tube may function satisfactorily if the hose is in a static condition , but fail quickly if the hose is subject to flexing .
3 . The Grade or Blend of the Rubber Compound :
Basic rubber polymers are sometimes mixed or blended together to enhance a particular property for a specific service . The reaction to a particular chemical blend of polymers may , therefore , be somewhat different from the reaction to the single ones . When in doubt , a sample of the compound should always be tested with the particular chemical it is to handle .
Chemical Resistance of House Compounds
Common Name
ASTM Designation D1418-93
Composition General Properties
Natural Rubber |
NR |
Isoprene rubber |
Excellent physical properties , including abrasion resistance , Not |
|
|
|
oil resistant |
SBR |
SBR |
Styrene-butadiene |
Good physical properties , including abrasion resistance , Not oil |
|
|
|
resistant |
Butyl Rubber |
IIR |
Isobutene-isoprene |
|
|
rubber |
EPDM |
EPDM |
Ethylene-propylene-dieneterpolumer |
|
|
|
Cross Linke Polyethylene
Ultra High Molecular Weight Polyethylene
XLPE
UHMWPE
Cross linked polyethylene
Ultra high molecular weight polyethylene
Nitrile Rubber |
NBR |
Acrylonitrile-butadiene |
|
|
|
Very good weathering resistance . Low permeability to air . Good physical properties . Poor resistance to petroleum based fluids .
Good general purpose polymer . Excellent heat , ozone and weathering resistance . Not oil resistant .
Excellent resistance to most solvents , oils and chemicals . Do not confuse with chemical properties of standard polyethylene .
Excellent resistance to most solvents , chemicals and hydrocarbons . Excellent abrasion and wear resistance . Inert and suitable for food contact . Do not confuse with chemical properties of standard polyethylene .
Excellent oil resistance . Good physical properties .
Neoprene |
CR |
Chloroprene rubber |
Excellent weathering resistance . Flame retardant . Good oil resistance |
|
|
|
. Good physical properties . |
Hypalon |
CSM |
Chloro-sulfonated |
Excellent ozone , weathering and acid resistance . Good abrasion |
|
|
|
and heat resistance . Can be compounded for good oil resistance . |
8 DNP Americas | 281-388-0253 | Fax 281-388-1902 | www . dnpamericas . com