When requiring a transparent high performance polymer, virgin FEP is often the best solution. To improve mechanical resistance, at the cost of losing transparency, FEP can easily be replaced by PFA or you can use standard or custom compound, depending on price, as FEP is usually less expensive than PFA. The best price/performance ratio in this case depends on the transformation process, the exact performance to be improved, and the impact of fillers. A long experience in fluoropolymers is needed in the decision of right material developments. It requires a strong experience in high performance polymer industry, and is one of 3P assets.