Carbon (hard and soft
(electrographatised))
- one of the most inert fillers
(except in oxidising environments-use glass)
- improves creep
resistance
- increases hardness
- raises thermal
conductivity
- chemically inert
- good dry running
properties
Carbon Fibre
- lower deformation under
load
- increased hardness
- better thermal conductivity
than glass filler
- lower wear against opposing
surface (esp. metal)
- less abrasive
- good properties in water
environment
- chemically inert
- resistant to hydrofluoric
acid
Graphite
- excellent wear properties
especially against soft metals
- displays high load bearing
capability in high-speed contact
- chemically inert
- improved thermal
conductivity
- often combined with other
fillers
Bronze
- improved thermal
conductivity
- better creep
resistance
- low abrasion
- increased compressive
strength
Molybdenum
disulphide
- adds to hardness
- improves sliding
properties
- little effect on electrical
properties
- normally used in low % with
other fillers
Polymeric Fillers
- such as polyimide (PI),
Polyphenylene Sulphide (PPS), Ekonol, PEEK, etc...
- low wear rates
- low abrasion of mating
surface - ideal against soft surfaces
- improved deformation under
load
Aluminium Oxide
- good electrical
properties
Calcium Fluoride
- good with chemicals that
attack glass
- electrical
applications
- good chemical
resistance
Stainless Steel
- good chemical
resistance
- improved thermal
conductivity
- reduced cold flow
Mica
- low shrinkage
- low thermal expansion
- poor mechanical
properties
Pigments
- some improvement on wear
resistance
- colour coding
All of the
above fillers are suitable for use with PTFE and may be used individually or in
various combinations, depending on the application requirements.
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