|
Properties of Fluoroplastics
|
| Property |
ASTM test method |
PTFE |
PFA |
FEP |
| Physical properties |
| Specific gravity |
D792 |
2.15 |
2.15 |
2.15 |
| Water absorption (%) |
D570 / 24 hrs 13"t |
<0.00 |
0.03 |
<0.01 |
Mold shrinkage
( cm/cm ) |
|
0.02 - 0.05 |
0.04 |
0.03 - 0.06 |
Contact angle
(degree) |
Angle to level |
110 |
115 |
115 |
| Thermal properties |
Thermal conductivity
(cal/sec/cm2, oC/cm) |
C177 |
6x10-4 |
6x10-4 |
6x10-4 |
Coefficient of linear thermal expansion
(1/oC) |
D696 / 23 - 60oC |
10x10-5 |
12x10-5 |
8x10-5 |
Melting point
(oC) |
|
327 |
302 - 310 |
270 |
Melt viscosity
(poise) |
|
1011- 1013
(340 - 380oC) |
104- 105
(380oC) |
4x104- 105
(380oC) |
Maximum temp for continuous use
(oC/oF) |
|
260 / 500 |
260 / 500 |
200 / 392 |
| Mechanical properties |
Tensile strength
(kgf/cm2) |
D638 / 23oC |
140 - 350 |
280 - 315 |
190 - 220 |
| Elongation(%) |
D638 / 23oC |
200 - 400 |
280 - 300 |
250 - 330 |
Compression strength
(kgf/cm2) |
D695/1% deformation, 25oC |
50 - 60 |
50 - 60 |
50 - 60 |
Tensile modulus
(kgf/cm2) |
D638 / 23oC |
4000 |
3800 |
3500 |
Flexural modulus
(kgf/cm2) |
D790 / 23oC |
5000 - 6000 |
6600 - 7000 |
5500 - 6500 |
Impact strength
(ft-lb/in) |
D256 / 23oC, Izod |
3.0 |
No breakdown |
No breakdown |
| Hardness ( Shore ) |
Durometer |
D50 - D65 |
D60 |
D55 |
| Deformation underload(%) |
D621/100oC, 70 kgf/cm2, 24 hrs |
5.0 |
2.4 |
5.0 |
| |
D621/25oC, 140 kgf/cm2, 24 hrs |
7.0 |
2.7 |
3.0 |
| Static friction coefficient |
Coated - steel surface |
0.02 |
0.05 |
0.05 |
| Electrical properties |
| Dielectric constant |
D150 / 103 Hz |
2.1 |
2.1 |
2.1 |
| |
D150 / 106 Hz |
2.1 |
2.1 |
2.1 |
| Dielectric dissipation factor |
D150 / 103 Hz |
<1x10-5 |
1x10-5 |
6x10-5 |
Dielectric breakdownstrength
(V / mil ) |
D149 / Short time, 1/8 in |
480 |
500 |
500 - 600 |
Volume resistivity
(ohm - cm) |
D257 |
>1018 |
>1018 |
>1018 |
| Other properties |
| Chemical resistance |
|
Excellent |
Excellent |
Excellent |
| Weatherability |
|
Excellent |
Excellent |
Excellent |
| Combustibility(%) |
D2863/Oxygen
concentration index |
<95 |
<95 |
<95 |
