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PTFE Compounds / 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