o-rings and seals

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Problem Solving Products, Inc.

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Centennial, Colorado 80112
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Home > Tips > Abrasion O-rings

 

Tip: Abrasion O-Rings

Resistance, or abrasion, must be taken into consideration if you are designing o-rings for dynamic conditions. The rubbing and scraping of the o-rings will cause abrasion particularly if the moving parts actually contact the o-rings. The choice of an elastomer is the major consideration in stopping abrasion. However, using a harder compound, up to 85 durometer, can also be effective. You may also need to consider providing adequate lubrication, using smooth metal finishes and eliminating contamination from all materials that cause abrasion.

In general, TFE, FEP, carboxilated nitrile and urethane have excellent resistance to abrasion; buna-n and FKM fluorocarbon have good resistance; and silicone has poor resistance.

We often see a failure pattern from abrasion in dynamic o-rings which are involved in a rotary, reciprocating or oscillating motion which is characterized by a flattened surface on one side of the cross section of the o-ring.

Here is a picture and description of an o-ring that has been damaged by abrasion.

Next Tip: Extruded rubber seals.

 

 

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