How to choose between virgin, glass-filled, and carbon-filled PTFE for chemical pump sealing.
| Pump Service | Recommended PTFE Grade | Why |
|---|---|---|
| Static gasket, low pressure | Virgin PTFE | Universal chemical resistance, cheapest |
| Static gasket, high pressure (creep risk) | 25% glass-filled PTFE | 3× creep resistance vs virgin |
| Dynamic seal (rotating shaft) | 25% carbon-filled PTFE | 10× wear life vs virgin in dynamic service |
| Bronze-filled (non-marking) | 40% bronze-filled PTFE | Highest thermal conductivity, dimensional stability |

Pure PTFE chemical-resistant sheet — virgin, glass-filled, and carbon-filled grades.
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