PTFE Coating
PTFE, or Polytetrafluoroethylene, coating is a fluoroplymer coating that is applied to fasteners to provide a durable, corrosion and chemical resistant, non-stick finish. The process is typically a 2-3 step system consisting of a metalic base layer primer, followed by an adhesion coat, and finally a fluoropolymer coating is applied. The fluoropolymer can be applied by either dipping or spraying the fastener then finished by spinning to dry and provide an even coating. There are several different trade names that can be called out referring to this process such as Xylan, FluoroKote, and more.
Application: Most often used in the oil/gas, food processing and waste water treatment industries. Very common on A193 B7 bolts/studs as well as A194 2H nuts and F436 flat washers.
Appearance: Wax like textured look. Most commonly blue in color, however there are several colors available.