The difference between PTFE gaskets and PTFE coated gaskets
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I often encounter the choice of gaskets in design. I have never understood the difference between PTFE pads and PTFE-coated pads and their respective scopes of application. Please give me some advice.
See "Steel Pipe Flanges, Gaskets and Fasteners". PTFE coated gaskets are only suitable for raised face flanges.
PTFE gasket PTFE plate ≤3.0 -108~250 Concentrated acid, alkali, solvent, oil PTFE coated gasket PTFE coated asbestos rubber plate gasket: suitable for anti-corrosion sealing at the joints of steel pipe flanges, liquid pipes and valves, and is a special seal product for petrochemical equipment. Implementation standards: HG20607-97 (European system) HG20628-97 (American standard) SH3402-96 (Petrochemical standard) Product specifications: standard and non-standard: PTFE Y type (cut type) DN15——DN200MM PTFE U type (folding type) DN200——5000MM Applicable temperature ； -100℃—+260℃ applicable pressure: PN＜4.0Mpa using medium: It is resistant to all chemical media except acid and alkali metals, elemental fluorine, and chlorine trifluoride.
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The PTFE coated pad is a PTFE-coated asbestos board, which is cheaper than the PTFE pad.
I feel that PTFE-coated gaskets can not only achieve the corrosion resistance of PTFE, but also reduce the tendency of cold flow. The price is not cheap. If this is the case, why are PTFE-coated gaskets rarely used in actual use, and PTFE is used more often?