Materials Guide

Gasket Materials Guide

What follows is general guide to gasket materials: their properties and applications.

Let’s first of all divide gasket materials into a few broad categories: (Note 1 bar = 14 p.s.i or 100,000 newtons/sq. Metre

1. Low pressures (less than a bar)

a) Temperatures below 100 centigrade (212 farenheit)

Simple lid or dust seals can utilise foam rubber.
If your application involves mineral oils only then consider paper or cork.

If there is water present or or some other liquid or gas look at rubber.
For food, electrical or chemicals you may need a special rubber or PTFE.
Or if you have good flanges and bolt loading then a solution may be non-asbestos jointing.

b) Temperatures above 100 centigrade (212 farenheit) and less than 220 centigrade (428 farenheit)

Consider Special Rubbers or PTFE.
Or if you have good flanges and bolt loading then look at non-asbestos gasket material.

2. High pressures and temperatures above 220 centigrade (428 farenheit)

a) Temperatures up to 450 centigrade (842 farenheit) but STEAM to 230 centigrade (446 farenheit)

First consider non-asbestos jointing.
If your application involves process cycling and steam look at graphite.

3. Special Applications

For temperatures above 450 centigrade with no oxygen present consider graphite.

If you have extreme temperatures but little pressure eg. turbochargers use mica.

Extreme conditions in pipework can be accommodated with spiral wound gaskets.

If you have a specific material requirement, you many require a food quality or pharmaceutical grade material.