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Moldflon ® The Compound Permeation
Moldflon ® The Compound Permeation
Permeation |
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Measured with helium With respect to permeation, measured with helium gas, Moldflon™ is positioned between PFA and modified PTFE. Compared to PTFE, it is a material with a clearly higher barrier effect. As a thermoplastic material that can be processed from the melt, Moldflon™, like PFA, has almost no more pore content, and – merely looking at the pore volume – one would expect a bigger difference between the two product classes, thermoplastics and PTFE, in terms of the barrier effect. However, the amorphous polymer content that is responsible for permeation is clearly higher with the thermoplastics PFA and Moldflon™ compared with conventional PTFE and modified PTFE: Whereas sintered PTFE has an amorphous content of about 30%, this content is about 60%, and thus twice as high, with PFA and Moldflon™, which are suitable for thermoplastic processing. The overlapping of both effects results in the relatively low barrier differences between PFA and Moldflon™ on the one hand and PTFE and modified PTFE on the other. Permeation, measured with helium on PFA, Moldflon™, mod. PTFE and PTFE under the influence of various amorphous contents. Measuring gas: Helium 
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