Carbon Filled PTFE was developed to provide a PTFE based material with improved mechanical strength.
In Carbon Filled PTFE formulations, also known as Carbon Filled PTFE Compound, the resultant material has excellent mechanical and wear properties, retains excellent frictional properties and is an excellent choice for seals and rings in dynamic and high-pressure applications.
Like all PTFE materials and filled grades of PTFE, it is essential to understand that even under a heading like “Carbon Filled PTFE”, we have many further variables. Materials can be manipulated to offer particular property improvements over others and even the base grade of PTFE used can display dramatic variations in physical properties and material performance.
The secret is knowing which is the right material for any given application and ensuring that is what is being supplied. With our expertise and knowledge, we have delivered a range of Carbon Filled PTFE machined parts for customers across numerous industries.
We can also help you develop a PTFE coating that is designed specifically for your intended use, with all our coatings being able to be adapted to suit a range of situations.
PTFE on its own has excellent frictional properties, elasticity and wear resistance but relatively poor mechanical strength and tends to fail in high PV applications. Carbon in itself is a brittle material with poor wear properties and mechanical strength.
However, together they offer excellent mechanical and wear properties, provide good thermal conductivity, low permeability and is also electrically conductive.
| Property | Test Method | 15% Carbon Filled |
|---|---|---|
| Specific Gravity | ASTM D 792 | 2.05 – 2.12 g/cm3 |
| Tensile Strength | ASTM D 4894 | 13 – 18 MPa |
| Elongation | ASTM D 4894 | 90 – 300% |
| Shore D Hardness | ASTM D 2240 | 60 – 66 |
| Deformation Under Load | ASTM D 695 | 5 – 7% |
| Permanent Deformation | ASTM D 695 | 2 – 4% |
| Flexural Modulus | 1105 MPa | |
| Coefficient of Static Friction | 0.14 – 0.16 | |
| Coefficient of Dynamic Friction | 0.12 – 0.14 | |
| Volume Resistivity | ASTM D 257 | 10-4 Ohm / CM |
| Service Temperature | -200°C / +260°C |
The most common Carbon Filled PTFE composition is 75% Virgin PTFE with 25% Carbon powder by weight. However, the type and percentage of carbon added to PTFE is a variable and is critical to material performance. It can be as little as 0.2% and as much as 40%. Different percentages of carbon will display different material properties and performance. From bushings & bearings and electrical components to wear pads, seals and valve seats, we continue to deliver Carbon Filled PTFE parts to our customers.
SealsWe supply large quantities of standard and custom seals for clients all across the world.
Valve SeatsWe can help you choose the right material for your Valve Seat application.
Component Design & ManufacturingWe can design and manufacture your product, part or component in Carbon Filled PTFE. Whether developing a new part from scratch or innovating to provide a new solution for a failing component, our engineers can design and manufacture products in Carbon Filled PTFE that will meet and exceed performance requirements.
Carbon filled PTFE has excellent compressive strength, wear and chemical resistance. It provides good thermal conductivity and low permeability. An ideal material for dynamic sealing applications.
The addition of Carbon Fibre to PTFE increases the compressive strength and wear resistance. It provides good thermal conductivity and low permeability. Commonly used in sealing applications.
