VIRGIN PTFE: Virgin Teflon contains no fillers and has almost universal chemical resistance. This virgin grade PTFE, and its advanced properties make it an ideal choice of material for a wide range of applications, especially for those requiring high temperature and chemical resistance whereas; PTFE can be used at any temperature from (-200°C to +260°C). PTFE is commonly referred to as Teflon and it has an excelent low friction, non-stick and release properties.
CARBON FILLED PTFE: Carbon is one of the best fillers for chemical use, except in oxidizing environments where glass performs better. Carbon adds to the creep resistance, increases the hardness and raises the thermal conductivity of PTFE. Carbon filled compounds have excellent wear properties. 25% Carbon-Filled PTFE has less deformation under the load properties compared to virgin PTFE.
GLASSFIBER FILLED PTFE: Glass fibre is the most widely used filler in PTFE. It improves the creep resistance of PTFE, both at low and high temperature. It is chemically stable (except to strong alkalis and hydrofluoric acid - HF). It has little effect on the electrical properties of PTFE, and improves its wear and friction behavior. A not uncommon problem with glass-filled PTFE is discoloration of the finished parts, in particular on the inside of large billets. The glass used in PTFE compounds has been treated by a proprietary process to reduce this discoloration.
BRONZE FILLED PTFE: Bronze is an alloy of copper and tin. Addition of high percentages of bronze filler in PTFE results in a compound having high thermal conductivity and better creep resistance than most other compounds. Bronze-filled PTFE is often used for components in hydraulic systems. Not suitable for corrosive or electrical applications. Bronze has a tendency to oxidize: bronze-filled compounds should therefore be used fresh and containers should always be kept closed.
|Properties||Test Metod||Unit||Virgin 100%
|Specific Gravity||ASTM D792||Gr/cm³||2.15-2.20||2.23-2.26||2.05-2.12||3.90-3.98|
|Elongation at Break||%||ASTM D1457||220-300||200-260||120-180||100-180|
|Compressive Strength 1% Deformation||N/mm²||ASTM D695||4.5||7.00||10.00||10.50|
|Impact Resistance||J/cm||ASTM D256||1.5||--||--||--|
|Deformation under load 14N/mm², for 24h-23ºC||%||ASTM D621||14.5||10-12||6-7||6-7|
|Hardness (shore D-15 sec)||Shore D||ASTM D2240||50-60||60-50||62-66||65-70|
|Friction Coefficient Dynamic||--||ASTM D1894||0.05-0.09||0.07-0.2||0.01-0.2||0.07-0.2|
|Permanent Deformation Under Load (after 24h - Relax. at 23ºC)||%||ASTM D695||8.0||5-6||3-4||2-4|
|Dielectric Constant (50hz - 10⁹hz)||--||ASTM D150||2.1||2.5||--||--|
|Dielectric Strength (Short-Time air Thickness 0,5 mm)||KV/mm||ASTM D149||55||13.00||--||--|
|Volume Resistivity||Ohm/cm||ASTM D257||10⑱||10⑮||10⁴||--|
|Coefficient of Linear Thermal Expansion from 25 to 100°C||°C-₁||ASTM E831||16x10⁵||10x10⁵||9.5x10⁵||9.5x10⁵|
|Max. Continuous Operating Temperature
Max. Temperature in air-Continuous
|Continuous Service Temperature||°C||--||-200/⁺260||-200/⁺260||-200/⁺260||--|
|Thermal Conductivity||W/mk||ASTM D2214||0.23||0.43||0.64||0.74|
*** PTFE is available in virgin & filled compounds to improve the basic characteristics to match very diverse application & optimization for specific and uses.
*** Filled PTFE Products, have the wide range of values.