Why Choose PTFE?
What is PTFE?
PTFE is a synthetic, high molecular weight fluoropolymer with fluorine atoms directly attached to the carbon only backbone.
The exceptionally strong Fluorine-Carbon bond gives PTFE a range of unique and valuable properties, making PTFE an incredibly versatile material which can be used across many industries and sectors.
Cowie® manufacture high quality products using well known tradenames such as Teflon™ (Chemours™) and Inoflon® (GFL™).
What are the advantages of PTFE?
Chemical Resistance
PTFE is one of the most chemically inert materials known. PTFE is compatible with very reactive and corrosive chemicals, in fact, over its operating temperature range the chemical resistance of PTFE is virtually total.
Rare exceptions include liquid/dissolved alkali metals, fluorine/fluorine compounds and very strong oxidisers.
Thermal Stability
PTFE is one of the most thermally stable plastics known. It remains effective over a wide range of temperature, from -200°C to 260°C. Thermal degradation does not commence until ~400°C.
Electrical Properties
PTFE has exceptional dielectric properties and is an excellent thermal insulator.
Non-stick / non-wetting surface
PTFE’s coefficient of friction is one of the lowest of any known solid material creating remarkable non-stick and non-wetting characteristics.
Flexural Strength
PTFE has a high flexural strength meaning that it is highly durable.
Purity
Virgin grade PTFE (i.e. no fillers or additives) is considered to have very high levels of purity and can therefore be used in applications where this is essential. For example, trace analysis and semiconductor manufacture.
The virgin grade PTFE used to manufacture Cowie products is both FDA and USP Class VI approved.
Typical Virgin Grade PTFE Properties:
| Property | Typical Value |
| Appearance | White, Opaque |
| Density | 2.15g/m3 |
| Melting Point | 327°C (621°F) |
| Tensile Strength | 20-40MPa (2900-5800psi) |
| Elongation at Break | 200-500% |
| Coefficient of Friction | 0.05-0.10 |
What are Modified & Filled PTFE?
Modified PTFE, e.g. TFM™ (3M™ Dyneon™) is a chemically modified version of PTFE with enhanced properties. It is created by co-polymerisation with a small quantity (<1%) of a perfluorinated modifier. This modification results in improved mechanical strength, reduced porosity and the ability to self fuse.
PTFE is available with a range of fillers, such as glass or carbon – to increase strength and durability.
Note: Filled PTFE does not have the same levels or purity as virgin material.
If you have any further questions, please Contact Us.