A Combination of Outstanding Properties
MoldflonTM is characterized by a well-balanced property profile. In the context of fully fluorinated PTFE and thermoplastic products, it is positioned between modified PTFE and PFA. With a melting point between 320°C and 315°C, it immediately follows modified PTFE.
Other physical and mechanical parameters, such as electrical properties or fatigue strength, are linked to the melting range used and will vary accordingly. This means that MoldflonTM can be adjusted very precisely to specific applications and optimized for their requirements.
Since MoldflonTM is resistant to nearly all chemicals or solvents, there is no need to compile a resistance list. Only a few exceptions need to be considered, which are summarized in the table below:
|Fluorinated hydrocarbons||Swelling, reversible in case of short-term exposure, irreversible in case of longer period of contact|
|Alkali metals, dissolved or molten||Fluorine elimination and polymer destruction|
|Fluorine elimination and polymer destruction||In case of higher temperatures, may trigger chemical reaction; material destruction and possibly severe reaction|
|Nitrating acid: mixture of concentrated sulfuric and nitric acid||Above 100°C slow material decomposition, carbonization|
|Monomers: styrene, butadiene, acrylonitrile, and others||May migrate into the material; in case of spontaneous polymerization: swelling or polymer destruction, popcorn effect|
|Physical impact: ionizing radiation||Gamma and beta radiation: dose of 10 kGy may reduce the mechanical properties by more than 50%|
The wear behavior of MoldflonTM differs significantly from that of PTFE and modified PTFE, particularly in the unfilled state. As shown in the chart, wear in this test amounts to only about 10% of the value obtained with PTFE and modified PTFE. This leap in quality is a result of the special molecular structure of MoldflonTM.
Compounds based on MoldflonTM exhibit lower wear than comparable PTFE-based compounds. The following figure compares the abrasion resistance of carbon fiber compounds with a filler content in the range 10–20%.
It is interesting to note that, as the filler content increases, the wear-reducing effect of MoldflonTM compounds with carbon fibers is higher than that of comparable PTFE compounds. The reason for this is the better setting of the filler particles within the polymer matrix. The better this is, the longer the duration of the wear-reducing effect.
Measured with Helium
With respect to permeation, measured with helium gas, MoldflonTM is positioned between PFA and modified PTFE. It has a noticeably higher barrier effect than PTFE.
As a thermoplastic material that can be processed from the melt, MoldflonTM, 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 MoldflonTM than 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 MoldflonTM, which are suitable for thermoplastic processing. The overlapping of the two effects results in the relatively low barrier differences between PFA and MoldflonTM on the one hand, and PTFE and modified PTFE on the other.
MoldflonTM has a high amorphous content and a crystalline phase with an extremely fine dispersion. In direct comparison with PFA, modified PTFE, and conventional PTFE, MoldflonTM is found to be the material with the highest degree of transmittance.
This property is particularly important in the UV range and is especially obvious with thin films and coatings. It is used, for example, in tubes requiring a high degree of transparency for sterilization of process media using UV light.