Properties


HIGH MELTING POINT, 342 DEG C

HIGH THERMAL STABILITY

USEFUL MECHANICAL PROPERTIES AT EXTREMELY LOW AND HIGH TEMPERATURES

INSOLUBILITY

CHEMICAL INERTNESS

LOW COEFFICIENT OF FRICTION

EXCELLENT WEATHERABILITY

FLAME RESISTANCE

WEATHER AND UV RESISTANCE

PURITY

 

Mechanical Properties of PTFE, PFA & FEP


 

Property

ASTM Standard

Unit

 PTFE 

 FEP 

  PFA 

Specific Gravity

D792

--

2.15

2.15

2.15

Tensile Strength

D638

psi

3000-5000

2800-5000

4000-4500

Elongation

D638

%

300-500

250-330

280-400

Flexural Modulus

D790

MPa

496

586

586

(psi)

-72,000

-85,000

-85,000

Folding Endurance

D2176

(MIT)

>106

5-80 x 103

10-500 x 103

cycles

Impact Strength

D256

J/m

189

No Break

No Break

(ft·lb/in)

-3.5

Hardness

D2240

Shore D pencil

50-65 HB

56

60

HB

Coefficient of Friction, Dynamic

D1894

--

0.05-0.10

0.08-0.3

--

 

 

General Properties of PTFE, PFA & FEP


 

Property

ASTM Standard

PTFE

FEP

PFA

Chemical/Solvent Resistance

D543

Excellent

Excellent

Excellent

Water Absorption 24h,%

D570

<0.01

<0.01

<0.03

Deformation Under Load

*D621 100 ºC

5

5

2.4

Deformation Under Load

**D621 25 ºC

7

3

2.7

Refractive Index

 

1.35

1.338

1.34

Arc Resistivity, % Sec

D 495

>300

>300

>300

>200

>300

>300

Limiting Oxygen Index, %

D2863

>95

>95

>95

 

 

Thermal Properties of PTFE, PFA & FEP


 

Property 

Unit

 PTFE 

 FEP 

  PFA 

Melting Point

°C

327

260

305

(°F)

-621

-500

582)

Upper Service

°C

260

204

260

Temperature(20000h)

(°F)

-500

-400

-500

Flammability

UL 94

V-0

V-0

V-0

Thermal Conductivity

 

1.7

1.4

1.3

BTU/hr/sq ft/deg F in

Thermal Conductivity Cal-cm/s-cm2, ºC

 

6 x 10-4

6 x 10-4

6 x 10-6

Linear Coefficient of Thermal Expansion

D 696 , 10-5 ºC

>11.6

8.3-10.5

13

Heat of Fusion

BTU/LB

29-37

11

13

Heat of Combustion

BTU/LB

2200

2200

2300

Low Temperature Embrittlement

°C

-268

-268

-268

(°F)

-450

-450

-450