Sheet in PTFE CP25 1219.2x1219.2 mm natural

PTFE CP25 is pure PTFE blended with 25 percent carbon powder. The filler solves the weak point of the fluoroplastic: pure PTFE cold flows under constant pressure and deforms over time. The carbon stabilizes the matrix, raises the compressive strength, improves heat conduction and reduces creep without losing the chemical resistance of the fluoroplastic.

The material keeps the properties of the PTFE base. The service temperature extends continuously up to 260 degrees and the material handles cryogenic conditions down toward 200 degrees below zero. The density sits slightly above pure PTFE, around 2.17 g/cm3 plus the contribution from the carbon. The fire rating is V0.

The chemical resistance is total in practice. The sheet takes concentrated acids, bases, solvents and most industrial chemicals that crush ordinary engineering plastics. Only molten alkali metal and fluorine under pressure count as real exceptions. The carbon filling does not affect that part to any noticeable degree.

The friction against steel is low and the material is self lubricating. The carbon is gentle on the mating surface and carries friction heat away better than pure PTFE, so sliding surfaces and bearings last longer under load.

The sheet format is used mainly where you need to cut out gaskets, sealing rings or slide plates. Typical scenarios:

Flange gaskets in chemical processes with temperature and aggressive media.

Valve seats and sealing plates in pumps.

Slide plates against thermal movement, for example under heat exchangers and exhaust lines where expansion has to be taken up.

Support rings in hydraulics and pneumatics where the material has to keep its shape under pressure.

Wear surfaces that have to run dry against metallic mating surfaces.

The sheet is machined with ordinary tools for plastic cutting. Sharp inserts, moderate feed and good cooling give clean cuts. CP25 is less prone to flowing during cutting than pure PTFE, which makes the dimensional tolerances easier to hold. The carbon filling wears the cutting edge less than glass fiber, but carbide is still the standard.

For welding or bonding you should know that PTFE is hard to bond at its core. Etching or a mechanical fastener is almost always required. This applies to the carbon filled grade as well.

In the inch format 1219.2x1219.2 mm in natural the sheet suits slide plates where the surface takes a lot of wear.

The sheet is supplied in the natural dark tone of the compound. If you want another thickness, dimension or a cut part to drawing, we arrange it. If you need help choosing between pure PTFE, a carbon filled grade such as CP25 or a glass fiber filled grade, get in touch and we will go through the load picture and the mating surface together.