PTFE

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