Page 427 - Cat4800-Oct2011

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Parker Industrial Hose Customer Service
866 810 HOSE (4673) 800 242 HOSE (4673)
Strongsville, OH
South Gate, CA
Eastern USA
Western USA
www.safehose.com
e-mail: indhose@parker.com
Chemical Guides
Chemical Guides Introduction
Te Chemical Guides in this section are ofered as a general indication of the compatibility of the various
compounds incorporated in Parker hose with the chemicals, fuids and media listed. Te basis for the ratings
includes actual service experience, the advice of various polymer suppliers, and the considered opinion of our
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 afect the resistance of a compound to a chemical attack are:
1. Temperature of the Media Transmitted:
Higher temperatures increase
the afect of chemicals on compounds. Te amount of increase depends
upon the polymer and the chemical. A compound quite suitable at room
temperature might fail very quickly at higher temperatures. Working
pressures in this catalog are recommended in accordance with ARPM
design safety factors at ambient temperatures. Do not operate outside hose
temperature limits. Even within hose temperature limits, end fttings and
hose size can afect performance at higher temperatures.
2. Service Conditions:
A rubber compound usually swells when exposed
to a chemical. Within a given percent of swell, a hose tube may function
satisfactorily if the hose is in a static condition, but may fail quickly if the
hose is subject to fexing.
3. Te Grade or Blend of the Rubber Compound:
Basic polymers are
sometimes mixed or blended to enhance a particular property for a specifc
service. As an example, the nitrile used as the tube material for Parker
aircraft fueling hose varies in its makeup from the nitrile used in the tube of
Day-Flo
®
Special Purpose hose. Consequently, the reaction to a particular
chemical may therefore be somewhat diferent. When in doubt, a sample
of the compound should always be tested with the particular chemical it is
going to handle.