PTFE Diaphragms

SEO | 16th Oct, 2018

PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3. According to experts, its melting point is 600 K (327 °C; 620 °F). It maintains high strength, toughness and self-lubrication at low temperatures down to 5 K (−268.15 °C; −450.67 °F), and good flexibility at temperatures above 194 K (−79 °C; −110 °F).

PTFE gains its properties from the aggregate effect of carbon-fluorine bonds, as do all fluorocarbons. The only chemicals known to affect these carbon-fluorine bonds are highly reactive metals like the alkali metals, and at higher temperatures also such metals as aluminium and magnesium, and fluorinating agents such as xenon difluoride and cobalt(III) fluoride.

Processing PTFE diaphragms can be difficult and expensive, because the high melting temperature, 327 °C (621 °F), is above the initial decomposition temperature, 200 °C (392 °F).[32] Even when melted, PTFE does not flow, but instead behaves as a gel due to the absence of crystalline phase and high melt viscosity.

PTFE diaphragms are used in sanitary applications and those involving strong chemicals, abrasives and higher temperatures or pressures. Depending on the type of pump, a PTFE diaphragm can work by itself or with a rubber backing for added strength. It is important to note that not all PTFE diaphragms are the same. Variations in the quality or grade of the PTFE and how it is manufactured can result in significant differences in performance and longevity.

Kurwa is one such company that manufactures PTFE diaphragms. These diaphragms are manufactured using high quality raw material, which is sourced from the licensed and reliable vendors. These diaphragms have high tensile and elongation property.

Kurwa specializes in PTFE lined Rubber Diaphragms (0.25mm, 0.5mm, 1.00mm lining thickness) as well as Pure PTFE Rigid (up to 3mm thickness) Diaphragms for all kind of Valves, pumps, and actuators used in critical corrosive applications. The Rubber used with PTFE Linings are Neoprene, EPDM, Butyl, and Hypalon.

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