The polyfluorocarbons, especially PTFE, are normally regarded as completely insoluble. Contamination due to dissolution is not, therefore, an issue when dealing with PTFE.

However, dissolution in materials such as cyclic polyfluorocarbon oligomers at 300ºC. and atmospheric pressure has been recorded. It is also known that other perfluorocarbons, perfluorocarbon ethers, perhalocarbons, sulphur hexafluoride and carbon dioxide will dissolve PTFE under the right conditions of temperature and pressure.

Prime quality PTFE resins are inherently very pure and this level of purity can be translated to the final product using molding methods pioneered by COWIE. The finished products have very high purity coupled with low porosity and correspondingly low levels of extractables.

PTFE is commonly known as Teflon^®, a registered trademark of E.I. du Pont de Nemours & Company.