PTFE is extremely useful as a gasket material, thanks to its almost chemically inert nature
Unfortunately, the material has a tendency to creep under load and has limited use in such applications
Modified PTFE materials allow the benefits of PTFE to be utilised at higher compressive loads and temperatures
For instance, expanding the PTFE produces a softer material with a higher strength
The addition of fillers such as silica, silicon carbide or barium sulphate lends the material better hot and cold flow resistance. Hence, the chemical resistance is not negatively affected
PTFE can also be used as an envelope instead of a more conventional compressed fibre gasket material insert
This combines the chemical resistance of the PTFE with the stress retention and recovery properties of the insert
The result? The negative effect of the PTFE on the joint’s mechanical stability is reduced
Remarkable chemical resistance
Suitable for use with foodstuff and pharmaceutical applications
Insoluble in solvents, even at increased temperature
Stable to light
Does not absorb water
Excellent electrical insulating capacity
Low thermal conductivity
Expanded PTFE materials has excellent creep resistance and bolt torque retention properties
This allows PTFE to be used at higher temperatures and to seal higher internal pressures
Expanded PTFE tape form with a pressure sensitive adhesive backing strip to assist with installation
Since the material is available in roll form it offers a solution to jointing needs without the need to maintain large stocks of cut gaskets
Combination rings or transition rings combine two different sizes having the same pitch diameter permitting bolt up of differing size flanges
Excellent chemical resistance
PTFE envelope gaskets comprise a compressed synthetic fibre gasket material insert with a PTFE envelope
The envelope protects the gasket from chemical attacks and provides required strength and resilience for demanding sealing operations
PTFE envelope gaskets offer excellent chemical resistance under moderate conditions of temperature and pressure
Non-asbestos Gaskets is made of high quality non-asbestos fabric and synthetic rubber
Non-asbestos Gaskets sealing ability is exceptional and safe against oil
Consists of pure carbon in which the crystalline structure has been considerably expanded through special chemical and thermal procedure
The expanded crystals are formed into foil by a multi-stage calendaring process
Thin flexible graphite foil can then be laminated into thicker sheets to manufacture a range of sealing products
Flexible graphite sheet can also be supplied with reinforcing materials to increase the tensile strength, load bearing capacity, and improve handling characteristics
Laminated graphite sheet materials are often used as a replacement for asbestos-based materials. Because of their excellent chemical resistance and temperature
Graphite laminate materials are ideal for steam applications as they do not contain a rubber binder and are not subjected to hardening of the material
Outstanding resistance to high and low temperature
Chemically resistant to virtually all media
High compressibility
Low creep under temperature or pressure
Seals gases and liquids effectively at low bolt loadings
