| Property | Specification(ASTM) | Unit | Material | ||||||
|---|---|---|---|---|---|---|---|---|---|
| PFA | FEP | ETFE | PVDF | ||||||
| General | Continuous service temperature | Maximum | °C | 260 | 200 | 150 | 150 | ||
| ° F | 500 | 392 | 302 | 302 | |||||
| Chemical resistance | - | Excellent | Excellent | Excellent | Good | ||||
| Specific gravity | D 792 | - | 2.15 | 2.15 | 1.73 | 1.78 | |||
| Electrical | Dielectric constant | D 150 at 103 Hz | - | 2.1 | 2.1 | 2.6 | 7.2 | ||
| D 150 at 106 Hz | - | 2.1 | 2.1 | 2.6 | 8.5 | ||||
| Dielectric dissipation factor | D 150 at 103 Hz | - | 0.0002 | 0.0001 | 0.0008 | 0.030 | |||
| D 150 at 106 Hz | - | 0.0003 | 0.0008 | 0.005 | 9 x 10-2 | ||||
| Dielectric strength (short term) 10 mils film | D 149 | Volt/mil | 2 000 | 2 000 | 2 000 | 1 600 | |||
| Volume resistivity | D 257 | Ohm•cm | >1018 | >1018 | >1016 | >1014 | |||
| Environmental | Water absorption | D 570 | % | < 0.03 | < 0.01 | < 0.03 | < 0.04 | ||
| Weather resistance | - | - | Excellent | Excellent | Excellent | Excellent | |||
| Oxygene index | D 2863 | % | > 95 | > 95 | > 30 | 44 | |||
| Flammability | UL 94 | - | V-0 | V-0 | V-0 | V-0 | |||
| Mechanical | Tensile strength | D 1708, D 638 | psi | 4 000 | 3 500 | 6 500 | 5 000 | ||
| Elongation | D 1708, D 638 | % | 300 | 300 | 200 | 150 | |||
| Compressive strength | D 695 | psi | 2 200 | 2 200 | 7 000 | 11 600 | |||
| Impact strength | D 256 at +23°C | Ft-Lb/in | No Break | No Break | No Break | 3-6 | |||
| Flexural Modulus | D 790 at +23°C | psi | 100 000 | 95 000 | 200 000 | 250 000 | |||
| Tensile Modulus | D 638 | psi | 40 000 | 50 000 | 120 000 | 200 000 | |||
| Hardness | D 2240 | - | D-60 | D-55 | D-75 | D-78 | |||
| Thermal | Melting point | ° C | 305 | 270 | 260° C | 160 | |||
| ° F | 581 | 518 | 500° F | 320 | |||||
| Thermal conductivity | C-177 | BTU/hr/ft 2/°F. in | 1.3 | 1.4 | 1.6 | 1.3 | |||
| Deflection temperature 66 psi 264 psi | D 648 | ° C | 74
48 |
59
57 |
104
71 |
113 | |||
| Deflection temperature 66 psi 264 psi | D 648 | ° F | 166
118 |
138
134 |
220
160 |
235 | |||
PTFE (POLYTETRAFLUOROETHYLENE)
PTFE has excellent properties such as chemical inertness, heat resistance (both high and low), electrical insulation properties, low coefficient of friction (Static 0.08 and Dynamic 0.01), and nonstick property over a wide temperature range up to 260ÊC. It has a density in the range of 2.1 to 2.3 g/cm3 and melt viscosity in the range of 25 mPa.s (cP). Molecular weight of PTFE cannot be measured by standard methods. Instead, an indirect approach is used to judge molecular weight. Standard Specific Gravity (SSG) is the specific gravity of a chip prepared according to a standardized procedure.The underlying principle is that lower molecular weight PTFE crystallizes more extensively, thus yielding higher SSG values.
TFM PTFE
The new generation of chemically modified PTFE enhances the performance of classic PTFE by providing outstanding low deformation under load, compression stress relaxation (recovery), reduced permeation, fewer voids, increased surface smoothness and good welding characteristics
PFA (PER FLURO ALKOXY)
(A POLYMER OF TETRAFLUOROETHYLENE AND PERFLUOROVINYLETHER)
PFA polymers are fully fluorinated and melt-processible. They have chemical resistance and thermal stability comparable to PTFE. Specific gravity of perfluoroalkoxy resins is in the range of 2.12 to 2.17. PFA has an upper continuous use temperature of 260ÊC crystallinity and specific gravity of PFA parts decrease when the cooling rate of the molten polymer is increased. The lowest crystallinity obtained by quenching molten PFA in ice was 48% (specific gravity 2.123).
FEP (FLUORINATED ETHYLENE-PROPYLENE COPOLYMERS)
(A POLYMER OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE)
Fluorinated ethylene-propylene copolymers are fully fluorinated and melt-processible. They have excellent chemical resistance and thermal stability. Specific gravity of FEP resins is in the range of 2.13 to 2.15. FEP has an upper continuous use temperature of 200ÊC.
ETFE (ETHYLENE TETRA FLUORO ETHYLENE)
(A POLYMER OF TETRAFLUOROETHYLENE AND ETHYLENE)
PVDF and equimolar ETFE are isomers but the latter has a higher melting point and a lower dielectric loss than the former. ETFE crystallizes into unit cells believed to be orthorhombic or monoclinic. The molecular conformation of ETFE is an extended zigzag.This polymer is dissolved in some boiling esters at above 230ÊC, thus allowing determination of molecular weight (weight-average) by light scattering. ETFE has several transitions, alpha relaxation at 110ÊC (shifts to 135ÊC at higher crystallinity), beta at 25ÊC and gamma relaxation at 120ÊC. ETFE has good mechanical properties including tensile and cut-through resistance and lower creep than perfluoropolymers. ETFE is more resistant to radiation than perfluoropolymers (modestly affected up to 20 Mrad) and can be crosslinked by radiation such as electron beam. Crosslinking is used to strengthen cutthrough resistance of ETFE wire insulation.
ECTFE
Halar ECTFE is a partially fluorinated semi-crystalline polymer offering a unique combination of properties for highly demanding industries.
It is widely used in anti-corrosion applications as a lining or in self-supporting constructions (piping).Its excellent fire resistance properties and chemical resistance make HalarÎ ECTFE a product of first choice in wire and cable applications, in communication cable or speciality cable.
PPH (POLYPROPYLENE HOMOPOLYMER)
Polypropylene is available in two basic types as either homo polymer or copolymer material. Although similar in many respects each type exhibits distinct differences in both appearance and performance. Polypropylene Homopolymer (PPH) is the most widely utilized. PPH offers a high strength to weight ratio and is stiffer and stronger than copolymer, this combined with good chemical resistance and weldability allows this material to be used in many corrosion resistant structures.
PFA (CONDUCTIVE)
3M DyneonTM Fluoroplastic PFA 8502ESDZ is an electrostatic dissipative fluorothermoplastic compound consisting of a fully fluorinated PFA base polymer and an electroconductive carbon black. The product has specifically been developed for transfer moulding.
