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Filling Agents for PTFE
| Filling agent | Form | Quantity (weight-%) |
Influence of the filling agent |
| Glass | Milled fibres | up to 40%, also in combination with graphite, MoS2 and carbon |
Compressive strength is increased Stiffness is increased Wear resistance is increased Cold flow is decreased Not alkali-stable Not acid-resistant Resistant against organic solvents |
| Carbon (hard and soft) |
Powder | up to 35%, also in combination with graphite and bronze |
Good dry run properties Compressive strength is increased Greater hardness Wear resistance is increased Thermal conductivity is improved Electrically conductive at higher quantities Resistant against hydrofluoric acid Is effected by highly oxidised inorganic substances (e. g. acids, alkaline solutions, halogens) |
| Graphite (synthetic) |
Powder | up to 15%, also in combination with glass, bronze and carbon |
Sliding properties are improved Friction number is reduced Thermal conductivity is improved Is effected by highly oxidised inorganic substances (e. g. acids, alkaline solutions, halogens) |
| Bronze | Powder | up to 60%, also in combination with MoS2, carbon and graphite |
Compressive strength is increased Higher hardness Wear resistance is increased Thermal conductivity is improved Cold flow is decreased Only under certain circumstances chemically resistant Is effected by alkaline solution and oxidised acids |
| Molybdenum disulphide (MoS2) |
Powder | up to 5%, also in combination with glass and bronze |
Sliding properties are improved Wear resistance is increased Is effected by highly oxidised inorganic substances (e. g. acids, alkaline solutions, halogens) |
| Steel (Cr/Ni) |
Powder | up to 60% | Thermal conductivity is improved Cold flow is decreased Largely chemically resistant |
| Pigments | Powder | up to 1-2% | In the case of inking (e. g. markings) electrically conductive |
| Conductive pigments | Powder | up to 2-3% | Electrically conductive |