1. Requirements for temperature and chemical resistance
Make sure that the gaskets you ordered can withstand operating temperature and medium resistance. Check the chemical compatibility of metal and filler to sealing medium. According to general practice, the metal used to make metal wound gaskets and metal coated gaskets should be similar to flanged materials.
The compressibility of flexible graphite makes it a good filler for making metal gaskets. Flexible graphite can not be used as a strong oxidant such as nitric acid and sulphuric acid, but it can be used at 450 C. PTFE fillers can provide excellent chemical resistance below 260 degree C. According to ASME B16.20, when PTFE is used as filling material, inner ring should be used to prevent radial instability of winding part.
2, work pressure
Working pressure has a direct impact on the design and selection of metal gaskets. Higher pressure may cause gaskets to blow out, and low pressure applications require gaskets designed to seal under low bolt loads.
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