Mechetec? LF13 - Acetal Homopolymer, 13% PTFE Powder filled - Low friction, FDA Compliant, brown color Mechetec Lf-13 utilizes a powdered PTFE at a 13% loading and is compliant with both FDA and USDA regulations at a cost that is up to 33% less than other filled acetal products, making it the workhorse of Nytef's enhanced wear acetal product family. Mechetec? Acetal (polyoxy-methylene) offers design engineers a superior blend of strength, stiffness, lubricity, and dimensional stability. These properties, along with inherent machining ease, have made Mechetec one of the most widely used engineering grade thermoplastics.