Tefzel ETFE HT-2185
Tefzel ETFE HT-2185 is a special purpose fluoroplastic resin available in translucent, 2.5-mm (0.1-in) pellets. Compared with other grades of Tefzel, it has a higher flow rate. Tefzel ETFE HT-2185 and the other Tefzel fluoroplastics are melt processible, modified copolymers of ethylene and tetrafluoroethylene. They are high-performance resins that can be processed at relatively high rates compared with fluorocarbon resins. They are mechanically tough and offer an excellent balance of properties. Table 1 shows typical property data for Tefzel ETFE HT-2185.
Tefzel ETFE HT-2185 is ideal for many end products, including electrical components, such as sleeving, coil forms, sockets, connectors, and switches; lab ware, such as tubing, valves, containers, and fasteners; battery or instrument components that require chemical inertness; and mechanical parts.
Tefzel ETFE HT-2185 can be processed by conventional melt extrusion techniques and injection, compression, transfer, and blow-molding processes. Compared with other grades of Tefzel, it can be processed with greater ease and speed, because of its high flow rate. Also, the melt viscosity of Tefzel is reduced with increasing shear rate; thus, permitting the use of pressure extrusions through narrow dies without requiring appreciable draw-down. Reciprocating screw injection molding machines are preferred. Corrosion-resistant metals should be used in contact with molten resin. Extruder barrels should be long, relative to diameter, to provide residence time for heating the resin to approximately 340°C (640°F).
Storage and Handling
The properties of Tefzel ETFE HT-2185 resins are not affected by storage time. Ambient storage conditions should be designed to avoid airborne contamination and formation of water on the resin when it is removed from containers.
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