Teflon™  AF is a family of amorphous fluoropolymers. These  materials are similar to other amorphous polymers in optical  clarity and mechanical properties, including strength, but  also perform like fluoropolymers in their performance  over a wide range of temperatures, outstanding electrical  properties, and chemical resistance. Teflon™  AF solutions are  made of Teflon™  AF amorphous fluoropolymer dissolved in  Fluorinert® FC-40. 

Applications 

Teflon™  AF can be used as a low-refractive-index coating  or covering for optical devices, including those that must  operate over a wide temperature range and in chemically  aggressive environments. Teflon™  AF offers a high level of  transmission throughout the optical spectrum from infrared  through ultraviolet. In electronics, Teflon™  AF may be used in optoelectronic  devices, where its optical clarity, temperature resistance, and  dielectric properties are beneficial. 

Processing 

Teflon™  AF 1601 is supplied as a 6% and 18% solution in  Fluorinert® FC-40 (boiling point, 155 °C [311 °F]). Teflon™ AF 2400 is supplied as a 1% solution in Fluorinert® FC-40.  These solutions can be cast into thin or thick pinhole-free  coatings by a variety of techniques, including spinning,  spraying, brushing, and dipping. Whichever coating methods are used, the coated product  must be heated above the Tg (160 °C [320 °F]) or (240 °C  [464 °F]) to remove all solvent. This gives a smoother coating  and improves the polymer’s adherence to the surface. For  additional information on adhesion, see the Chemours  technical bulletin, “Adhesion Guide for Teflon™  AF.”