PTFE

Polytetrafluoroethylene (PTFE) is a synthetic resin produced by the polymerization of tetrafluoroethylene. It is also popularly known by the trade names such as Teflon, Fluon, Hostaflon, and Polyflon depending on the region it is manufactured. It is a is a versatile engineering plastic distinguished by its slippery surface, high melting point, and resistance to attack by almost all chemicals. As the polymer was found to have exceptional properties with regards to chemical inertness, heat resistance & frictional properties; developmental manufacturing began in 1943 with joint efforts of kinectic Engineering Inc., USA & E.I. Du Pont de Nemours & Co. Inc., in USA in 1948. The applications of PTFE prevail in wide in industries like chemical, mechanical, electrical and strategic applications. The world wide consumption of PTFE is around 1,40,000 tonnes per annum and is expected to grow at 10% per annum.

History of PTFE

PTFE was discovered in 1938 by an American chemist, Roy J. Plunkett. He was working for or E.I. du Pont de Nemours & Company (now DuPont Company). PTFE was discovered quite by an accident. Roy was working on the development of a new refrigerant when he discovered refrigerant had polymerized to a white powder. After examination they found that the substance was strong, waxy and tough, weather resistant and nonflammable.
During the early 1930s, the production of PTFE was directed for World War II. It was used as corrosion-resistant coating to protect metal equipment that were involved in handling of radioactive materials in the Manhattan Project. It played a pivotal role in development of the weapon that would end the war.
PTFE  has its name in The Guinness Book of World Records for its phenomenon of “slickest substance”. It boasts to have the lowest co-efficient of static and dynamic friction that any solid can have.

PTFE's contribution to other segments

PTFE proved to be critical for space travel. It was used as lining in rocket fuel tanks to support fuel lines. It was used in was used in fabrication of the Space Shuttle’s Thermal Protection System. The liquid oxygen tank’s precious cargo was protected with PTFE insulation. It was also used for electric insulation in space ships.
PTFE has important use in flights also. Bearings associated with flight control applications in aircrafts and helicopters employed thin layer of PTFE based composites bonded to metal surfaces that helped them to achieve essential  friction reduction.
It proved a dry film lubricant of choice in the automotive racing industry through “coating” of friction surfaces. It re-emerged as a viable engine performance and longevity enhancement technique.
In a vast variety of other industrial applications, PTFE usage has spread to chemical process Industries, mechanical industries, electrical and electronic industries. It’s usage has spread from tubing and hoses to protective coatings for fabrics, to high performance films, to wire and cable industries, and beyond to gaskets and seals.

Application of PTFE

  1. 1. Chemical Process Industries:
  2.    Rods, bushes, sheets
  3.    Expansion joint/Bellows: Line Beloows, Valve bellow & bellows as per customers specification.
  4.    Gaskets – Slit type & Milled type envelope gaskets, ready cut gaskets.
  5.    Mechanical Packaging – Chevron packaging, O/V/D/U rings, cups, seals.
  6.    Laboratory Ware – Beakers, Plug Cocks, Tubes.
  7.    Valve & Pump Components – Ball seats, Stem seals, Body seals, Plug Sleeves, Diaphrams, Balls.
  8.    Thread Seal Tapes

  1. 2. Mechanical Industries:
  2.    Users for machines tools guide ways & slide ways
  3.    Piston Rings / Sodium itched sheet
  4.    Low load high speed bush bearings
  5.    Guide bands & piston seals for hydraulic & machine pneumatic actuators / seals
  6.    Thin walled tubings
  7.    Hysteresis – Friction washers for clutches

  1. 3. Electrical & Electronic Industries:
  2.    PTFE sintered insulation tape for insulation
  3.    PTFE films for capacitor
  4.    Chemically treated – Insulator bushes for traction
  5.    PTFE Brush Holder

  1. 4. Glass Lined Vessels Spares:

   Main hole eleptical gaskets, body flange gaskets, flush bottom valve seat, 'T' Bushes, Sight glass Bush Ring.

PTFE Grades:

PTFE is available in virgin and filled compounds to improve the basic characteristics to match very diverse applications & optimization for specific end uses.
Grades

Filler content by weight

Properties

Virgin PTFE

----

Excellent chemical Resistance, outstanding electrical Properties & Excellent flexural properties.

Glass filled PTFE

15-25%

Higher compressive strength, Better wear resistance & Excellent chemical resistance.

Carbon / Coke filled PTFE

25-35%

Higher compressive strength, Better thermal conductivity & Better wear resistance.

Graphite filled PTFE

0.15

Good chemical resistance, Higher compressive strength, Improve frictional properties.

Bronze filled PTFE

40-60%

Good thermal conductivity, Very low cold flow Higher compressive strength, Excellent wear resistance.

Bronze plus Molybdenum Disulphide Filled PTFE

55+5%

Improved frictional properties, Good thermal conductivity, Very low cold flow, Higher compressive strength & Excellent wear resistance.



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INCEPTED IN 2000, AT MUMBAI, MAHARASHTRA, INDIA, WE, “SHASHI FLUOROPLASTIKS”, ARE ONE OF THE RENOWNED MANUFACTURERS, DISTRIBUTORS AND SUPPLIERS OF QUALITY RANGE OF PTFE MACHINE & MOULDED PRODUCTS.

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