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NAK Technical Information - Lip Material

It is important to consider the environment in which a seal will operate when selecting the sealing element material. The most important factors are:

  • Temperature
  • Medium being sealed
  • Pressure
  • Shaft speed

The table below provides general information to help select the compound according to their physical properties.

Physical properties of four major compounds

Compound Nitriles
(code N)		 Poly Acrylates
(code P)		 Silicone
(code S)		 Fluoro Rubber
(code V)
Temperature Range -40oC -30oC -50oC -30oC
Abrasion Resistance 2 3 4 2
Compression Set 2 3 2 2
Cracking Resistance 3 3 1 2
Cut Growth Resistance 2 2 4 4
Flex Cracking Resistance 3 3 2 2
Impact Strength 2 4 3 3
Oxidation Resistance 2 1 1 1
Sunlight Resistance 3 1 1 1
Tear Resistance 2 4 4 3
Weathering Resistance 2 1 1 1

1 = Excellent      2 = Good      3 = Fair      4 = Poor

The temperature range may vary depending on the operating conditions.

Other compounds available include Water Resistant Nitrile, High Nitrile, Abrasion Resistance Nitrile, High Temperature Nitrile, Neoprene, Polyurethane, EPDM, Natural Rubber, Leather, Teflon, Styrene Butadiene, Felt and other specialised compounds prepared to order.

 
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