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F – C – C – C – C – C – F
F F F F F
Teflon is a synthetic resin with excellent chemical resistant as well as consist of typical heat resistance and rub resistance.
Although it is used purely, there are also used with glass fiber, graphite, Mos2 (molybdenum), bronze for material strengthening.
– Heat resistance 260℃
– Low friction coefficient and lubrication
– Excellent chemical resistance
– Excellent insulation
– Univiscous
– insolubleness (it doesn’t melt)
– Gasket, packing, seat
– Chemical piping lining
– bearing filter, etc.
The material that works with VALVE SEAT or other parts of Teflon is working with MOLDING POWDERS.
Literally, the powdered material put into an electric oven and heated to 365 ℃ to make the products.
We put filling material for the weight of VALVE depending on the pressure and temperature weight of the VALVE, mostly, put
① GLASS FIVER 15%, 20%, 25%
② GRAPHITE 15%, 30%
③ CARBON 10%, 15%, 25%
④ 20% GLASS FIBER 5% GRAPHITE
⑤ GLASS FIBER 15% MOS2 5%, etc.
In these latter days, various of filling materials such as stainless steel, copper, and monel are added according to their needs.
As shown in the diagram, the range of usable temperature is decreasing depending on the size of the valve.
For example, it can be used up to about 190℃ in the size of 1/2”~1” in a pressure of 20kg, but it can be drop to 150℃ in 5”6”, and further drops to 130℃ in 8”~12”.
However, currently in Korea, 15% material of impregnation has been using, so the temperature range is narrower 5~7% than 20% material.
For reference, linear expansion rate is set to 0 at 23 °C, 0.5% at 50°C, 0.97% at 100°C, 1.9% at 150°C, 2.85% at 200°C and shrinkage at 0°C.
In general, usable temperature of PTFE ranges from-180°C to +260°C in indirect heat when there is no pressure and weightlessness.
* Carbon 10%, 15% have no problem with raising temperature of about 10% than GLASS 20% impregnated materials.
∗ Products with high pressures and frequent cooling and overheating are easy to use body or cap of VALVE as an inserted device.
∗ Graphite’s Impregnated product is similar to carbon but it is granulated and separated from the body when it used. The ccoefficient of friction is better than carbon but the bending point is not
∗ Ductility added to 15% GLASS Filber MOS2 5%, the temperature is used slightly (2~3%) higher than 15%GLASS Fiber, and price is similar to Carbon.
