Engineering plastics â The Manual - F.wood-supply.dk
Engineering plastics â The Manual - F.wood-supply.dk
Engineering plastics â The Manual - F.wood-supply.dk
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
F<br />
C<br />
F<br />
F<br />
C<br />
F<br />
n<br />
80<br />
PTFE<br />
F F<br />
C C<br />
F F<br />
n<br />
60<br />
40<br />
PTFE Structural formula PTFE<br />
H F<br />
C C<br />
n<br />
H F<br />
PVDF Structural formula PVDF<br />
H F<br />
C C<br />
n<br />
H F<br />
• Stress [MPa]<br />
20<br />
0<br />
0 5 10 15<br />
20<br />
• Strain [%]<br />
TECAFLON PVDF (?)<br />
TECAFLON PVDF<br />
PVDF<br />
TECAFLON<br />
PVDF, PTFE (DIN designation)<br />
Polyvinylidene fluoride (PVDF) and polytetrafluoroethylene<br />
(PTFE) belong to the group of highly chemically resistant<br />
fluorothermo<strong>plastics</strong>. Due to its high molecular<br />
weight, highly chemically resistant PTFE cannot be processed<br />
by melting, but only by pressing and sintering to<br />
create semi-finished products. PVDF can be formed by extrusion.<br />
Properties: PVDF<br />
ˌˌHigh density<br />
ˌˌStrong and tough<br />
ˌˌMinimal toughness at low temperatures<br />
ˌˌHigh chemical resistance<br />
ˌˌHydrolysis-resistant<br />
ˌˌVery low moisture absorption<br />
ˌˌHigh thermal expansion<br />
ˌˌHigh dissipation factor, polar,<br />
not suitable for high-frequency applications<br />
ˌˌHigh resistance to UV radiation<br />
ˌˌPVDF is significantly more resistant to energetic<br />
radiation than all other fluorothermo<strong>plastics</strong><br />
ˌˌInherently flame resistant, self-extinguishing<br />
ˌˌReleases highly toxic gas in case of fire<br />
Properties: PTFE<br />
ˌˌVery high crystallinity<br />
ˌˌHighest density of all polymers<br />
ˌˌVery tough down to low temperatures<br />
ˌˌMinimal strength and hardness<br />
ˌˌPoor creep strength<br />
ˌˌExtremely high resistance to chemicals,<br />
also to oxidizing acids<br />
ˌˌHydrolysis-resistant<br />
ˌˌNo stress crack formation<br />
ˌˌVery low moisture absorption<br />
ˌˌHigh thermal stability, but low<br />
dimensional stability at temperature<br />
ˌˌAnti-adhesive properties, very good<br />
sliding properties, no stick-slip behaviour<br />
ˌˌHigh resistance to UV radiation<br />
ˌˌVery sensitive to severe radiation (gamma and X-rays)<br />
ˌˌNot bondable with conventional materials<br />
ˌˌHigh thermal expansion<br />
ˌˌMinimal dissipation factor<br />
ˌˌVery good electrical insulation properties<br />
due to their low microstructure density, RAM extruded<br />
products offer characteristics such as minimal dielectric<br />
strength under high voltage)<br />
ˌˌInherently flame resistant, self-extinguishing<br />
ˌˌCombustion gases are fluoric, highly toxic<br />
28
Change language