Redco™ PTFE (Polytrifluoroethylene) is one of our most popular materials at Redwood – and for good reason. With the lowest coefficient of friction, no water absorption, self-lubricating properties, and excellent chemical resistance, Redco™ PTFE is a high-performing material that excels in a multitude of applications. Although Redco™ PTFE is well-known for its versatility and performance, there is still confusion surrounding the material; more specifically, how to bond it to substrates.
Recently, one of our customers was unaware that since PTFE is both chemically inert and made from incredibly stable bonds, it is difficult to join it to a substrate unless the material is chemically modified. Thankfully, this issue can be remedied through etching, a process that can be performed by our PTFE suppliers prior to shipment of the material to us.
What is etching?
Etching is the process of chemically altering the surface of a material using a special sodium solution. By dissolving one side of the PTFE to break up its carbon-fluorine bonds, the previously inert surface enters a “high-energy state” that allows it to interact with other substances. Once the material has been properly etched, a special two-part epoxy called BA 500 Epoxy Adhesive* is applied to bond the PTFE to the substrate. Etched sides of PTFE turn brown, but don’t worry, etching only affects the top few molecular layers; the PTFE is just as remarkable as before.
*Note: BA 500 Epoxy Adhesive is not supplied by Redwood Plastics & Rubber and must be procured separately.
Internet rumors falsely claim that ‘off the shelf’ bonding agents or simply roughing up the PTFE surface will facilitate bonding. Unfortunately, these methods either fail completely or only provide a very weak bond for a short amount of time. Etching the PTFE is the only reliable, long-term solution to bond PTFE to a substrate.
How do I ensure my PTFE is etched?
Etching PTFE is a special process that does not come standard with the PTFE stock in our inventory. To ensure that your PTFE can successfully bond with any substrate, it is crucial to include a request for etched PTFE at the time your Request for Quote (“RFQ”) is submitted. This request will help to avoid disappointment and delays with your order.
For more information about etched PTFE and whether it’s the right fit for your application, please contact us. Our team of experts are always available to help you find the best solution for your needs.
