Tuesday, 17 November 2015
Material Selection
Its very difficult to choose the right gasket for the job these days, there are just
so many styles. There are many different packings with similar properties and prices.
And with the ban on asbestos-based materials, there are many more styles being made
to replace them.
The four basic things you have to keep in mind when selecting a material are as
follows:
• Operating Pressure
• Bolt Load
• Resistance to chemical attack (Corrosion)
• Operating temperature
The corrosion resistance can vary based on a couple different factors:
• The concentration...
Styles of PTFE
Molded and Sintered PTFE: This type of PTFE was the first to be introduced to the market. This style is made from virgin or reprocessed PTFE resin, without fillers, which is then molded, compressed and sintered. As with any other type of plastic, PTFE has a high creep factor when compressed. The creep factor is detrimental and can lead to having to re-tighten the bolts to maintain seating pressure and prevent leakage. The
higher the temperature in the application it is used for, the more the creep factor will increase. Even with these drawbacks,...
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