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Comparison table of material characteristics
Properties Unit ASTM Test
Method		 TFE
(PTFE)		 FEP PFA
Physical Speacific gravity - D792 2.14-2.20 2.12-2.17 2.12-2.17
Melting point ℃ D3418 327 253~282 302~310
Mechanical Tensile strength kgf/㎠ D638 280~350 200~320 320
Elongation % D638 200-400 250-330 280-300
Compressive
strength		 kgf/㎠ D695 120 150 -
Modulus of
elasticity in tension		 10³kgf/㎠ D638 4 3.5 -
Modulus of
elasticity in bending		 10³kgf/㎠ D790 3.5-6.3 6.7 6.7-7.0
IZOD Impact strength ㎏·㎝/㎝ D256 16.3 Not
Destroyed		 Not Destroyed
Hardness
 Roc
kwell		 D785 R25 R25 -
Duro
meter		 D2240 D55 D55 D60
Thermal Thermal
conductivity		 10-4 cal/
cm·sec·℃		 C177 5.9 6 -
Specific heat cal/℃/g D240 0.25 0.28 -
Coefficient of
linear expansion		 10-5/℃ D696 9.9
(23-66℃)		 8.3-10.5
(-73~71℃)		 12
(21-100℃)
Continuousservice
temperature		 ℃ - 260 200 260
Heat distortion
of
temperature		 4.6kgf/
㎠ -℃		 D648 121 72 75
18.5kgf/
㎠ -℃		 D648 55 50 48
Electrical Volume
resistivity		 Ω·㎝ D257 >1018 >1018 >1018
Surface resistivity Ω D257 >1016 >1016 >1016
Dielectric strength (1/8inch)
KV/㎜		 D149 16-24 20-24 20-24
Dielectric constant - D150 <2.1 2.1 2.1
Dielectric constant - D150 <2.1 2.1 2.1
Dielectric
constant		 - D150 <2.1 2.1 2.1
Chemical Acid-proofness - D543 Excellent Excellent Excellent
lkaline-
proofness		 - D543 Excellent Excellent Excellent
Resistance to
solvents		 - D543 Excellent Excellent Excellent
Durability Combustibility - D635 Incombusti
bility		 Incombusti
bility		 Incombusti
bility
Water
absorption		 - D570 <0.01 <0.01 0.03
Properties Unit ETFE CTFE VdF
(PVdF)		 VF
(PVF)
Physical Speacific gravity - 1.7 2.1-2.2 1.75-1.78 1.4
Melting point ℃ 270 210~212 170 200~210
Mechanical Tensile strength kgf/㎠ 455 300~400 400~520 300~400
Elongation % 200 80-250 100-300 150-200
Compressive
strength		 kgf/㎠ 500 320-520 600 -
Modulus of
elasticity in tension		 10³kgf/㎠ 8.4 11
Modulus of
elasticity in bending		 10³kgf/㎠ 14 17.6 14.0-18.0 -
IZOD Impact strength ㎏·㎝/㎝ 13.6-14.7 19.6-21.8 -
Hardness
 Rock
well		 R50 R75-95 R110-115 -
Duro
meter		 D75 D74-90 D75-80 -
Thermal Thermal
conductivity		 10-4 cal/
cm·sec·℃		 5.7 4.7-5.3 3 4.9
Specific heat cal/℃/g 0.46-0.47 0.22 0.33 -
Coefficient of
linear expansion		 10-5/℃ 9-9.3
(20-90℃)		 4.5-7.0 8.5 3.95
Continuousservice
temperature		 ℃ 150 180 150 107
Heat distortion
of
temperature		 4.6kgf/
㎠ -℃		 - 115 145 -
18.5kgf/
㎠ -℃		 74 76 90 -
Electrical Volume
resistivity		 Ω·㎝ >1016 >1016 2.0 X 1014 4 X 1013
Surface resistivity Ω 5x1014 - - -
Dielectric strength (1/8inch)
KV/㎜		 16 20-24 10.2 -
Dielectric constant - 2.6 2.24-2.8 8.4 -
Dielectric constant - 2.6 2.24-2.7 7.72 7.4
Dielectric
constant		 - 2.6 2.3-2.5 6.43 -
Chemical Acid-proofness - Excellent Excellent Good Good
lkaline-
proofness		 - Excellent Excellent Good Good
Resistance to
solvents		 - Excellent Excellent weakness in
a polar solvent
or ketone		 -
Durability Combustibility - Incombusti
bility		 Incombusti
bility		 Self-
Extinguishing		 Self-
Extinguishing
Water
absorption		 - 0.029 0 0.04 <0.5