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ASTM Standards

A. Specifications PTFE Resin Filled PTFE Compound- Primary Forms

Sr. No.

Title

No.

1

PTFE Resin

D - 1457 D - 4894

2

Filled PTFE Compounds

D - 4745

B. Test Procedure PTFE Resin - Primary Forms

1

Apparent Density

D - 1895

2

Bulk Factor

D - 1895

3

Pourability

D - 1895

4

Filler Content

E - 1131

5

Particle Size

D - 4894

6

Shrinkage

D- 4894

7

Flow Index (Powder Flow)

D - 1855

8

Colour / Appearance

D - 6290

9

Water Content

D - 6980

C. Specifications PTFE Products Secondary Forms

1

PTFE Molded Basic Shapes

D - 3294

2

PTFE Rod-Molded

D - 1710

3

PTFE Bush-Molded

D - 1710

4

PTFE Rod- Ram Extruded

D - 3295

5

PTFE Tube- Ram Extruded

D - 3295

6

PTFE Molded Sheet

D - 3294

7

PTFE Skived Sheet

D - 3308

8

PTFE Tube Paste Extruded

D - 1710

D. Test Procedure PTFE Products - Secondary Forms

1

Density

D - 792

2

Tensile Strength

D - 638

3

Elongation

D - 638

4

Compressive strength

D - 695

5

Deformation Under Load

D - 621

6

Flexural Strength

D - 790

7

Impact Strength

D - 236

8

Hardness Shore D

D - 2240

9

Coefficient of Friction

D - 1894

10

Water Absorption

D - 570

11

Heat Resistance

D - 648

12

Continuous Service Temperature

D - 648

13

Thermal Conductivity

D - 696

14

Linear Thermal Expansion

D - 696

15

Die-electric Strength

D - 149

16

Volume Resistivity

D - 257

17

Surface Resistivity

D - 258

18

Dimensional Stability

D-1710

19

Chemical Resistance

D - 543

20

Wear Rate

D - 137

British Standards PTFE Resin (Primary Form) Products(Secondary Form)

1

Specification of PTFE Materials (Primary Forms)

BS ISO 12086

2

Test Procedures of PTFE Resin (Primary Forms)

BS ISO 12086

3

Specification of PTFE Parts (Secondary Forms)

BS EN ISO 13000

4

Test Procedures of PTFE Parts (Secondary Forms)

BS EN ISO 13000

Indian Standards - PTFE Resin (Primary Form)

1

Polytetrafluoroethylene (PTFE) Materials for Moulding Extrusion

IS-14635

 

Selection Guide of PTFE and Filled PTFE

PTFE is available in virgin & filled compounds to improve the basic characteristics to match very diverse applications & optimization for specific end users. The grade of PTFE is selected from Virgin & Filled PTFE grades of PTFE, based on required property for required service conditions / applications. The selection guide elaborates various grades of PTFE & Filled PTFE, filler content in PTFE, basic properties & relevant service conditions / End user applications

Sr.No.

Grade

Filler Content by Weight %

Standard Series

Properties

Applications

1

Virgin PTFE

-

Yes

  • Hygienic
  • Excellent chemical resistance
  • Outstanding electrical properties
  • Excellent flexural properties

Gaskets, Bellows, food / contact & medicine / human consumption applications.

2

Chemically Modified PTFE

-

Yes

  • Less Creep.
  • Improved Permeation Resistance
  • Smoother Surfaces
  • Less Porous
  • Better High Voltage Insulation
  • New Fabricating Versatility with welding

Pumps, Diaphragms, Ball Valve Seats, Components of Mechanical Seals, Dipped Pipes for reaction vessels, Vessel Lining

3

Pigmented PTFE

  -

No

  • Improved Visibility

Colour  coded electrical  cable sheathings

4

Glass filled PTFE

15 - 25

Yes

  • High compressive strength
  • Excellent chemical resistance
  • Improved wear resistance under load & permanent deformation

Ball valve component, bridge bearing pads, ship launching pads,pipe supporting pads.

5

Carbon/Coke filled PTFE (soft amorphous/ hard fiber)

25 - 35

Yes

  • High compressive strength
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