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58 KRHCA0109
The Chemical Guides in this section are offered as a general indication of the compatibility of the various materials
used in ALFAGOMMA® hose with the chemicals and fuids listed. The basis for the ratings in this guide include
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, the hose tube may
function satisfactorily if the hose is in a static condition, but fail quickly if the hose is subject to fexing.
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
specifc 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.
GENERAL CHEMICAL RESISTANCE OF ALFAGOMMA® HOSE
COMPOUNDS
KEY TO GENERAL CHEMICAL RESISTANCE CHART
Note: All data based on 20°C (68°F) unless otherwise noted.
Blank = No Data
E = Excellent
G = Good
F = Fair
C = Conditional
I = Insuffcient Data
X = Unsatisfactory
Chemical Guide
Common Name
ASTM
Designation
D1418-93
Composition General Properties
Natural NR Isoprene Rubber (Natural) Excellent physical properties, including abrasion resis-
tance. Not oil resistant.
SBR SBR Styrene-Butadiene Rubber Good physical properties, including abrasion resistance.
Not oil resistant.
EPM or EPDM EPDM Ethylene-propylene-diene-terpolymer Good general purpose polymer. Excellent heat, ozone and
weather resistance. Not oil resistant.
Neoprene CR Chloroprene Excellent weathering resistance. Flame retarding. Good oil
resistance. Good physical properties.
BUNA-N or Nitrile NBR Nitrile-Butadiene Excellent oil resistance. Good physical properties.
Hypalon® CSM Chloro-sulfonated polyethylene
Excellent ozone, weathering and acid resistance. Good
abrasion and heat resistance. Can be compounded for
good oil resistance.
Cross Linked Polyethylene XLPE Cross Linked Polyethylene
Excellent resistance to most solvents, oils and chemicals.
Do not confuse with chemical properties of standard
polyethylene.
Butyl IIR Isobutene-Isoprene
Very good weathering resistance, low permeability to air.
Good physical properties. Poor resistance to
petroleum-based fuids.
Chlorobutyl CIIR Chloro-Isobutene-Isoprene Same general properties as Butyl and excellent resistance
to high heat steam.
UHMWPE UHMWPE Ultra-High Molecular
Weight Polyethylene
Excellent resistance to a majority of existing chemicals.
Meets FDA requirements for food and beverages.
Synthetic Rubber Synthetic Rubber Black conductive synthetic rubber, excellent resistance to
Biofuel based fuids.
KRHCA 09