WS 7110 | WS 7115 | WS 7221
Description
IDT-PTFE-sheets and gaskets are made from high quality 3M™
Dyneon™ TFM™. The basic characteristics of PTFE [polytetrafluoroethylene] are based on the special molecular structure of the fluorine and carbon atoms; both chains have an extremely strong bond. The carbon network is hermetically sealed by the fluorine atoms which makes a chemical attack extremely hard and the PTFE therefore becomes resistant to chemicals and solid.
The pharmaceutical-chemical industry requires low permeation for sealing applications, high chemical resistance, solid mechanical resilience and easier processability. Only few materials, mostly on fluoropolymer basis, combine these advantages. TFM™, a PTFE of the second generation, has proven itself. TFM™ distinguishes itself from classic PTFE by the additionally applied modifier. The particles melt more easily into a dense, low pore polymer structure due to the achieved, more homogeneous crystalline structure; as a result the tightness is significantly improved. A further disadvantage of classic first generation PTFE is that it flows under load [cold flow] and resulting in a loss of surface pressure in clamped condition. This negative characteristic has been significantly improved with the development and gasket technology application of TFM™ and the cold flow behavior has been optimized. An additional modification can be achieved in a finishing process by mixing in filler or aggregates.
During recent years, the use of the modified compound TFM™ 4105 with 25% glass fiber content has stood the test in the gasket technology practice. Semi-finished products and sheets as the source material for non-metallic gaskets are produced in a press-sinter process.
