Valve Seat Material
Polytetrafluoroethylene or PTFE is the commonly used versatile, high-performance fluoropolymer made up of carbon and fluorine atoms.
Apart from being used in the kitchen, PTFE is used as a cost-effective solution for industries ranging from oil & gas, chemical processing, industrial to electrical/electronic and construction sector, etc. of the common applications of this polymer is non-stick coating in kitchen cookware (pans, baking trays etc.), hence, you can easily find this in your kitchen.
PTFE's melting point is around 327°C, and pure PTFE is almost totally chemically inert, highly insoluble in most solvents or chemicals, and thermally stable enough to be used between -200 degrees C and +260 degrees C without degrading.
Non-stick and electrically resistantThermal resistant
Lower deformation under load (cold flow reduced by a factor of three)Stronger and more versatile than regular PTFE
Denser polymer structure
Reduced permeation of chemicals and gases Down to half of the standard PTFE value
Smoother surfaces on machined parts
Excellent weld ability
TFM, known as PTFE-TFM, is polytetrafluoroethylene with perfluoropropylvinylether as an additional modifier, giving a denser material which is stiffer, also creep resistant like PFA, and weldable.
Better creep performance
Good electrical and mechanical properties
Glass Fiber filled PTFE
It improves cold flow resistance and wear resistance, widely used for piston ring., bearing, like gaskets etc.
Glass fiber is the most commonly used filler in PTFE as it offers much improved compression and wear properties
The material may also be inert gas sintered to further improve creep properties and reduce porosity and gas permeability but please be noted that would be a consequent loss of tensile properties.
Glass Filled PTFE is reinforced with glass fibers with the percentage varying between 5% and 40% depending on the needs of the application. As the filler percentage increases so does the properties the filler offers (increased compressive strength, lower deformation under load) but conversely the coefficient of friction properties of the material increases over that of virgin PTFE.
Lower thermal expansion
Lower deformation under load
Higher coefficient of friction.
Abrasive filler unsuitable for some applications.
Resistance to gas permeation is reduced.
It will be damaged by hydrogen fluoride and strong alkalines.
Graphite Filled PTFE
Highly effective in sealing various types of chemicals. Graphite lowers the coefficient of friction and Graphite filled PTFE has excellent self-lubricating properties.
The percentages used vary between 5 and 15%. Graphite lowers the coefficient of friction and is, therefore, often added to other types of filled PTFE for improving this property. It improves the deformation under load, strength and, to a minor degree, the wear properties.
Cold flow resistance
Low starting friction
Low coefficient of friction
Wear & Tear resistance
Excellent engine efficiency
Not resistant to halogenides, elemental fluorine, CF3, molten alkali metal
Bronze filled PTFE
The addition of Bronze to PTFE gives better dimensional stability and lowers creep, cold flow and wear resistance. It increases hardness and compressive strength whilst also increasing thermal and electrical conductivity.
Reinforced with bronze powder with the percentage varying between 40% and 60%, resulting in a very hard wearing material.
Extremely hard wearing material
Very heavy-high specific gravity
The best wear properties of any filled PTFE
Great deformation strengths
Good thermal conductivity
Not suitable for electrical applications
Poor chemical resistance than other grades of PTFE
Carbon Fiber filled PTFE
It improves mechanical characteristics, such as wear resistance, load resistance characteristics and flexuaral strength. It is often the best choice in automotive applications such as shock absorbers and water pumps. It is an excellent material for use in piston rings, bearings and thrust washers.
Carbon Fiber lowers creep and increases flex and compressive modulus. It raises hardness properties and exhibits wear characteristics in water applications. A 15% fill is typically called out in certain AMS specifications (Aerospace Material Specifications), however customer specific fill percentages are available upon request.
Improved Compression and Wear Resistance
Excellent Chemical Resistance
High Strength Properties
PEEK offers chemical and hydrolysis resistance similar to PPS, but can operate at higher temperatures. It can also be used in hot water or steam without permanent loss in physical properties.
PEEK offers good wear resistance and can be used continuously to 480°F (250°C). For hostile environments, PEEK is a high strength alternative to fluoropolymers and carries a V-O flammability rating and exhibits very low smoke and toxic gas emission when exposed to flame.
Excellent mechanical and chemical resistance
Thermal properties and high-temperature tenacity
Low moisture absorption
Good wear and abrasion resistance
Long service life
Excellent heat distortion properties
Low coefficient of friction
Good radiation resistance
PEEK is attacked by halogens and strong acids as well as some halogenated compounds and aliphatic hydrocarbons at high temperatures. It dissolves completely in concentrated sulfuric acid at room temperature.
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