Both ETFE and PTFE have many similar properties, and are commonly known by DuPont’s trade name as Tefzel® and Teflon® respectively. Both are great materials to reduce corrosion in piping systems. However, due to the difference in their structural formula, they have slightly different properties which make them suitable for different requirements and applications.
Ethylene tetrafluoroethylene, or ETFE, is made up of carbon, fluorine and hydrogen, and is a fluorine based plastic. On the other hand, polytetrafluoroethylene, or PTFE, is made up of long strings of carbon and fluorine atoms, and is a fluorocarbon solid.
ETFE has a lower working temperature of up to 150°C, whereas PTFE has a higher working temperature of up to 230°C. This makes PTFE harder to burn and more heat resistant than ETFE. With our in-house rotomoulding machine, Almarc is able to utilise rotomoulding technology to seamlessly line a variety of customised fittings and vessels suitable for applications of a lower working temperature of up to 150°C.
PTFE has the lowest friction coefficient, making it an extremely non-stick material commonly known to be used to coat non-stick Teflon pans. Additionally, PTFE’s friction coefficient is 1/3 of ETFE’s, meaning a lower build up of static caused by friction making it a better choice in applications which require high flow rate.
ETFE also has a higher tensile strength than PTFE, meaning it can be subjected to higher tension before breaking. This allows for ETFE to be put under harsher operating conditions compared to PTFE. Our PTFE lined pipes combat this by providing the structural strength of steel on the outside while allowing customers to enjoy the benefits that PTFE provides.