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To over come some of the weaknesses of conventional PTFE , scientists has developed the new chemically modified PTFE available as Dupont's Teflon Nxt or Dalkin's TFM and have improved some of the properties for the benefit of consumers.

Improvements At a Glance :
  • Less Creep.
  • Improved Permeation Resistance.
  • Smoother Surfaces.
  • Less Porous.
  • Better High Voltage Insulation.
  • New Fabricating Versatility with welding.

Chemically Modified PTFE parts offers new opportunities for designing & engineering high performance products to get following working advantages.

Improved Creep Resistance :
As PTFE Gasketing & Sealing materials used in chemical process industries, due to improved creep resistance & increased stiffness even at elevated temperatures. The modified PTFE components can be used for higher pressure conditions.

Enhanced Permeation Resistance :
The vessal linings, Tubings, Sealing materials, Expansion joints, Made out of modified PTFE have more life & less / near zero leakage due this enhanced permeation resistance.

Superior Surface Finish :
The Components, surfaces made out of modified PTFE have superior surface finish with silky / glossy surfaces. The components remain absolutely clean as there is virtually no place for impurities to get a grip.

Reduced Porousity :
The parts made out of modified PTFE have low microvoid content, thus showing the transmigration of aggressive liquids & gases through.

Better High Voltage Insulation :
Modified PTFE allows better high voltage insulation giving new opportunities to improve performance particularly in electrical applications.

Weldability :
The threaded joints / snug fit joints can be avoided by using directly welded part to part, thus reducing the risk of leakage through threaded joints.

Comparison Of Typical Properties Of Conventional PTFE and Modified PTFE
Sr No. Parameter Standard Conventional PTFE Value Modified PTFE Value
1 Colour Visual Milky White Translucent White
2 Density ASTM-D-792 2.1~2.2 gm/cc 2.1~2.15 gm/cc
3 Tensile Strength ASTM-D-638 200~300 kg/cm2 300~400 kg/cm2
4 Elongation ASTM-D-638 250~350% 350~450%
5.a Compressive Strength at 1% Deformation ASTM-D-695 35~40 kg/cm2 45~60 kg/cm2
5.b Compressive Strength at 10% Deformation ASTM-D-695 140~145 kg/cm2 170~200 kg/cm2
6 Coefficient Of Friction - - -
A Static ASTM-D-1894 0.05 0.045
B Dynamic 0.04 0.035
7 Hardness ASTM-D-2240 50~55 Shore D 50~60 Shore D
8 Service Tempreature ASTM-D-648 - 200~+260℃ - 200~+260℃
9 Water Absorption ASTM-D-570 0% 0%
10 Dielectric Strength ASTM-D-194 10~15 Kv/mm 30~32 Kv/mm
11 Service Conditions (Properties) --
  • Hygienic
  • Excellent chemical resistance
  • Outstanding electrical properties
  • Excellent flexural properties
  • Less Creep
  • Improved Permeation Resistance
  • Smoother Surfaces
  • Less Porous
  • Better High Voltage Insulation
  • New Fabricating versatility with welding
12 Applications -- Gaskets, Bellows, Food/Contact and Medicine/Human Consumption Applications Diaphragms, Components of Mechanical Seals, Vesel Lining.
Comparative Permeation Rates For Modified PTFE & Conventional PTFE :
Permeant Specimen Thickness,
mm (in)		 Vapor Liquid Gas
PTFE M-PTFE PTFE M-PTFE PTFE M-PTFE
Perchloroethylene 1 (0.04) 5.5 2 13 4 - -
Perchloroethylene 2 (0.08) 1.4 0.1 0.019 0.005 - -
Perchloroethylene 3 (0.16) 0.08 0.05 0.006 0 - -
Perchloroethylene 4 (0.20) 0.055 0.050 - - - -
Hexane 5 (0.08) 3.4 0.2 23.4 0 - -
Hexane 6 (0.20) 0.045 0.015 - - - -
MEK 7 (0.08)
MEK 8 (0.20) 36.3 23.3 49.4 34.2 - -
HCI, 20% 9 (0.04) 0.4 0.1 - - - -
Helium 10 (0.08) - - - - 93 1
Helium 11 (0.20) - - - - 0.18 0.12

Applications Of Chemically Modified PTFE (m-PTFE) :
Due to superior properties of M-PTFE to conventional PTFE, the typical application of M-PTFE includes Pumps Diaphragms (Improved permeation), Ball Valve Seats (Improved Creep Resistance), Components of Mechanical Seals (Improved permeation and surface finish), Dipped Pipes for reaction vessels (Improved surface finish and weldability), Vessel Lining (Improved permeation and weldability)

Chemically Modified PTFE (m-PTFE) Products:
Hindustan Nylons manufacturers Ram Extruded Rigid Pipes, Skived Sheets / Vessel Liners, Bellows / Expansion Joints, Valve Components, Mechanical Seal Components, Pump Components process in variety of standard sizes.

M-PTFE Components as per specific sizes / drawing & in standard - Filled compositions can be available, subject to minimum order quantity.

Grades Of Chemically Modified PTFE (m-PTFE)

There are various Virgin and Filled grades available in m-PTFE, subject to minimum order quantity.

  • Virgin m-PTFE
  • 15/25% Glass Filled M-PTFE.
  • 25/35% Carbon Filled M-PTFE.
  • 15% Graphite Filled M-PTFE.
  • 40 / 60% Bronze Filled M-PTFE.
  • 55% Bronze + 5% MOS2 Filled M-PTFE.
  • 15% Glass + 5% MOS2 Filled M-PTFE.
  • M-PTFE Components can be available in Non standard – customer specific composition, subject to minimum order quantity.
  • M-PTFE Component can be available with Sodium Itching / Chemical Treatment, subject to minimum order quantity.