Chemours Tefzel ETFE HT-2195 is a premium-grade fluoroplastic resin designed for use in rotational molding. To be effective as a rotational molding resin, Tefzel ETFE HT-2195 is a free-flowing powder with controlled particle size, shape, and size distribution.
The properties of Tefzel ETFE HT- 2195 in molded form are similar to other grades of Tefzel fluoroplastic resin. Table 1 shows typical property data for Tefzel ETFE HT-2195.
Rotational molding is a favored process for making hollow parts (particularly large parts) or for parts with complex geometries. Depending on part design and processing conditions, Tefzel ETFE HT-2195 can also be used to rotoline items; whereby, the Tefzel™ binds to the inner surface of the part to form a lining.
Tefzel ETFE HT-2195 is ideal for many end products for fluid handling in chemical processing industries, including pump housings, vessels, columns, elbows, tees, and pipe sections with unusual shapes. In addition, any hollow structure with internal contours that permits uniform coating by powder flow is a candidate for lining, provided it can withstand high temperatures.
For rotational molding, Tefzel ETFE HT-2195 powder is placed inside a hollow metal structure that is slowly rotated biaxially and heated above the melting point of the powder (253 °C [487 °F]). Frequently, the mold or part containing the resin is preheated (with rotation) to a temperature just below the melting point of the resin. Then, the temperature is raised to above the melting point of the resin to allow for formation of the lining. As the powder melts, it is deposited on the inner surface of the structure. Powder flow and distribution are critical, because the high melt viscosity of Tefzel limits the lateral flow of melted resin. A cooling step then causes the molten resin to solidify and densify in place, creating an integral lining or a removable, hollow plastic part. A typical thickness is about 2.3 mm (0.090 in). A thickness as high as 6.4 mm (0.250 in) has been molded. Good moldings and linings require close attention to many details, such as choice of metals for the mold, preparation of the metal surface, rate of rotation, venting, and heating/ cooling cycles. The equipment must operate at high temperature and resist thermal shock.
Storage and Handling
Ambient storage conditions should be designed to avoid airborne contamination and the formation of water condensation on the resin when it is removed from containers.
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