MANUAL.LM20 Revision C January 2023 Page 41 of 52
Appendix D: Fluid Compatibility Tables
The following table is compiled primarily from data published by several manufacturers of elastomers and
plastics. The ratings are intended only as a guide. In fact, different sources do not always agree, so it is
best to test before committing to a particular compound. In general, most chemical attack on elastomers
and plastics is in the form of swelling and softening. The function of the individual part determines how
much swelling and softening can be tolerated. In addition, some materials are resistant to certain fluids
at room temperature, but will be attacked at an elevated temperature. Duration of exposure is also a
factor; again, it is best to test.
A considerable body of data exists beyond what is presented here. If the fluids you are concerned with do
not appear in this list, please contact MFIC for our best assessment of probable compatibility.
D.1 The Elastomers
Nitrile:
Otherwise known as Buna N or NBR. This is one of the most common synthetic rubber materials. Nitrile is
normally used in the air motor of the Microfluidizer
TM
equipment, though it can certainly be used in fluid
contact as well.
EPDM:
Also called EPR or Ethylene Propylene Rubber. A specialty elastomer with excellent resistance to ketones
and most alcohols, but EPR is seriously attacked by petroleum oils, so the user must be careful about
lubricating this compound. Toughness and temperature resistance are very good.
Fluoroelastomer: (Trade name, Viton)
Also called FKM, this a premium elastomer with a broad range of chemical compatibility. Excellent in oil
services, but poor in ketones and some alcohols. Colored brown for easy identification. This is our
commonly used elastomer for fluid contact services.
Neoprene:
Otherwise known as Chloroprene or CR, this is one of the earliest known types of synthetic rubber. Useful
in applications such as ammonia and Freon.
D.2 The Plastics
UHMWPE:
Ultra high molecular weight polyethylene, an extremely tough, wear-resistant thermoplastic with good
chemical resistance and moderate temperature resistance. Used for seals and gaskets.
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