PEER Seals Catalog - PEER Bearing - (Version JPG) - Page n° 4 - PDF Catalogue | Technical Documentation

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Radial ball bearing, Shaft seal, Bearing unit, Roller bearing, Bearing

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Materials and Specifications

GENERAL ELASTOMER INFORMATION

* Maximum temperature limits dependent on other operating conditions.

** PTFE, Ethylene Acrylate and other elastomers are available.

E = Excellent G = Good, for most applications F = Fair, can be used if no other materials are available X = Not recommended

ADVANTAGES

DISADVANTAGES


NITRILE	Commonly referred to as Buna-N or NBR. Low cost. Good resistance to petroleum oils, water, silicone oils, greases and glycol based fluids. Good abrasion resistance, cold flow and tear resistance.	Poor resistance to ozone and weather aging.
POLYACRYLATE	Polymerised acrylic acidesters. Good resistance to mineral oils, hypoid gear oils, E.P. additives, greases, aging and flex cracking.	Fair cold temperature limit. Lower mechanical strength. Higher cost than Nitrile. Poor dry running ability and water resistance.
SILICONE	Broad temperature range. Good ozone resistance. Resistant to compression set.	Low resistance to hydrocarbon fluids like gasoline and paraffin or steam above 50 psi. Higher cost than Polyacrylate.
FLUOROELASTOMER	Good temperature resistance. Compatible with a wide range of fluids. Commonly chosen as a high temperature replacement for Nitrile or Polyacrylate.	Fair resistance to water and dry running. High cost.