氟塑料一般物性表

 

Property Comparison of Various Fluoropolymers

Property ASTM test method/test condition PTFE PFA FEP ETFE CTFE
 


Physical Properties

Specific gravity D792
D570/24 hrs 1/2"t		 2.13~2.22 2.12~2.17 2.12~2.17 1.70~1.76 2.10~2.18
Water absorption (%)            
Mold shrinkage (cm/cm)   0.02 ~0.05 0.04 0.03~0.06 0.03~0.04 0.015~0.020
Contact angle (degree) Angle to level 110 115 115 96 84

Thermal Properties

Thermal conductivity (cal/sec/cm)

 C177 6 X 10-4 — 6 X 10-4 5.7 X 10-4 4.7~5.3
X 10-4
Coefficient of linear thermal expansion (1/°C) D696/23~60°C 10 X 10-5 12 X 10-5
 8.3~10.5
X 10-5		 5~9 X 10-5 4.5 ~ 7.0 X
10-5
Melting point (°C)   327 302~310 270 260 210~212

Melt viscosity (coise)

   10-11~10-13
(340-380°C)		 10-4~10-5
(380°C)		 4X10-4
~10-5
(380°C) 		10-4~10-5
(300-330°C) 		10-7
(23°C)
Maximum temp. for continuous use
(°C/°F)
  260/500 260/500 200/392 150/302 120/248

Mechanical Properties
Tensile strength
(kgf/cm2) 		D638/23°C
 140~350 280~315 190~220 410~470 320~420
Elongation (%) D638/23°C 200~400 280~300 250~330 420~440 80~250
Compression strength (kgf/cm2) D695/1% deformation, 25°C 50~60 50~60 50~60 109 90~120
Tensile modulus
(kgf/cm2) 		D638/23°C 4,000 — 3,500 5,000~8,000 10,500~21,000
Hexural Modulus
(kgf/cm2) 		D790/23°C 5,000~6,000 6,600~7,000 5,500~6,500 9,000~14,000 13,000~18,000
Impact strength
(ft-lb/ln)		 D256/23°C lzod 3.0 — No breakdown No breakdown 2.5~2.7
Hardness (Shore) Durometer D50~D65 D60 D55 D75 D90
Deformation under load (%) D621/100°C
70 kfg/cm2,
24 hrs
D621/25°C
140 kgf/cm2,
24 hrs

5.0

7.0

2.4

2.7

5.0

3.0

5.4

2.3

2.6

0.2
Static friction coefficient Coated steel surface 0.20 0.50 0.50 0.60 0.80

Electrical Properties
Dielectric constant

D150/103Hz
D150/108Hz

 2.1
2.1 		2.1
2.1 		2.1
2.1 		2.6
2.6 		2.3~2.7
2.3~2.5
Dielectric dissipation factor D150/103HZ
D150/108HZ
2 X 10-5 1 X 10-5
3 X 10-5		 6 X 10-5
5 X 10-5		 8 X 10-4
5 X 10-3		 (2.3~2.7)
X10-2
1 X 10-2
Dielectric breakdown
strength (V/ml)		 D149/Short time, 1/8 in 480 500 500~600 400 500
Volume resistivity (ohm-cm) D257 >10-18 >10-18 >10-18 >10-18 >10-18
Chemical resistance Weatherability Combustibility (%)

D2863/Oxygen
concentration index		 Excellent

Excellent
>95 		Excellent

Excellent
>95 		Excellent

Excellent
>95 		Excellent

Excellent
>31		 Excellent

Excellent
>95