Fluoropolymer Applications in the Chemical Processing by Sina Ebnesajjad

By Sina Ebnesajjad

A self-contained selection of info and data on functions of fluoropolymers parts for corrosion keep an eye on in chemical processing industries.

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Extra resources for Fluoropolymer Applications in the Chemical Processing Industries: the Definitive User's Guide and Databook

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Static coefficient of friction remains unchanged in the temperature range of 27°C–327°C which is important in applications where a polytetrafluoroethylene part may experience heat buildup and temperature increase. Polytetrafluoroethylene’s coefficient of friction rises quickly with sliding speed (below 30 m/min, Fig. 26), which prevents “slipstick” behavior. No noise takes place even at slow speeds. 27 indicates that static coefficient of friction decreases with increase in pressure. 8 Tensile stress vs temperature at constant strain.

3 Electrical Properties of PTFE Electrical stability of polytetrafluoroethylene is outstanding over a wide range of frequency and environmental conditions. This plastic makes an excellent electrical insulator at normal operating temperatures. Dissipation factor and dielectric constant values are virtually constant up to 10 MHz. Dielectric strength of PTFE drops off with increasing frequency slower than most other material. PTFE dielectric constant and dissipation factors remain constant over a broad temperature range (-40 to 240°C) as seen in Fig.

75 g/cm2. With No. ). 29. 30. 4 Cumulative weight loss in milligrams *Armstrong Abrasion Test: This test measures abrasion resistance of a flat surface by rotating a 10 cm diameter specimen disk beneath an abrasive under load. A 1,000 g load was used on a Calibrase wheel No. CS-17F. 7 Average tape length in centimeters* *Armstrong Abrasion Test (MIL-T-5438): This test measures abrasion resistance of wire coating by drawing, under load, a clean abrasive cloth tape of continuous length across the test wire until the coating is worn through.

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