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Is PTFE Safe in Electrical Environments? The dielectric constant of PTFE is largely independent of temperature and will not leave a carbon ‘track’ when subject to arcing. Unaffected by weathering and ageing, PTFE is not wetted nor will it absorb water. It can be used as an external electrical insulator. Other products you may also interested: 1. expanded ptfe products 2.Ptfe seal 3.Ptfe gasket 4.Eptfe product 5.PTFE Sheet