POLY TETRA FLUORO ETHYLENE
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1 POLY TETRA FLUORO ETHYLENE PTFE - SEMIFINISHED & FINISHED PRODUCTS PTFE is a high performance engineering speciality polymer invented by Dr. Roy J. Plunkett at Du Pont's Jackson th Laboratory, New Jersey, US, on 6 April As the polymer was found to have exceptional properties with regards to chemical inertness, heat resistance & frictional properties; developmental manufacturing began in 193 with joint efforts of Kinetic Engineering Inc., USA & E.I. Du Pont de Nemours & Co. Inc., USA. The commercial production went operational by E.I. Du Pont de Nemours & Co. Inc., USA in 198. The world wide consumption of PTFE is around 1,0,000 Tonnes per annum and is expected to grow at % per annum. POLYMER SCIENCE TFE Monomer is generally manufactured by synthesis of Calcium Fluoride (Fluorospar), Sulphuric Acid & Chloroform. The polymerisation of TFE is carried out in carefully controlled conditions to form PTFE. The chemical structure of PTFE is due to presence of stable & strong C-F bonds, PTFE molecule possess outstanding chemical inertness, high heat resistance & remarkable electrical insulation characteristics, in addition to excellent frictional properties.
2 GENERAL PROPERTIES PTFE is a polymer which is extensively used in Chemical, Mechanical, Electronic & Electrical industries due to its unique characteristics: Ø Chemical inertness to all known chemicals however attacked by molten alkali metals, chlorine, trifluorides, fluorine & related fluorine complexes at elevated temperatures & pressures O Ø Resistance to solvents, insoluble in all solvents up to 260 C. Certain high fluorinated oils swell & dissolve PTFE at temperature close to crystalline melting point. O O Ø Wide operating temperature range -250 C to +260 C, at atmospheric pressure Ø Lowest coefficient of friction among all known metals & non metals Ø Nontoxic & antistick properties / Negligible water absorption / Nonflammable Ø Resistance to radiation : electrical properties remain practically unchanged during & after irradiation, both in air & vaccum Ø Excellent weathering resistance Ø Outstanding electrical / insulating properties over wide frequency range PTFE FILLED COMPOSITIONS PTFE is available in virgin & filled compounds to improve the basic characteristics to match very diverse application & optimization for specific and uses Grades Virgin PTFE Filler Content by weight Properties Glass Filled PTFE Carbon / Coke Filled Graphite Filled PTFE 15 Bronze Filled PTFE 0-60 Bronze + Molybdenum Disulphide filled PTFE Glass + Molybdenum Disulphide filled PTFE 5/ Pigmented PTFE Excellent Chemical Resistance Outstanding electrical properties Excellent flexural properties Better wear resistance Excellent chemical resistance Better wear resistance Better thermal conductivity Excellent chemical resistance Outstanding electrical properties Excellent flexural properties Excellent wear resistance Very low cold flow Good thermal conductivity Improved frictional properties Excellent wear resistance Very low cold flow Good thermal conductivity Better wear resistance Excellent chemical resistance Color coding Inferior chemical resistance CAUTION : The presence of filler generally causes following negative features in compounds : Reduction in tensile strength & break elongation. l Reduction in volume & surface resistivity. l Difficulty in processing & fabrication. l Lower chemical resistance depending upon type of filler. l Reduction in coefficient of linear thermal expansion. l
3 PTFE APPLICATIONS Chemical Process Industries 1. Rods, Bushes, Sheets & Tubes 2. Expansion joints Line Bellows, Valve bellows, PTFE+GFT Composite bellows, Custom bellows 3. Gaskets Envelope, Ready cut Gaskets, Universal Rope Gaskets, Fused joint circular elliptical equipment envelope gaskets. Mechanical Packing Chevron packings, O/V/D/U Rings, Cup Seals 5. Valve& Pump Components Ball Seats, Stem Seals, Body Seals, Plug Sleeves, Diaphrams, Balls 6. Laboratory Ware Beakers, Plug cocks, Tubes 7. Thread Seal Tapes Mechanical Industries 1. Liners for machine tools guideways & slideways 2. Piston Rings / Sodium Itched Sheet 3. Low load high speed bush bearings. Guidebands & piston seals for hydraulic & machines Pneumatic actuators / seals 5. Thin walled tubings 6. Hystersis Friction washers for clutches Electrical & Electronic Industries 1. PTFE Sintered insulation tape for insulation 2. PTFE films for capacitor 3. Chemically treated Insulator bushes for traction. PTFE Brush Holder Glass Lined Vessels Spares 1. Mainhole eleptical gaskets, Body flange gaskets, flush bottom valve seat, 'T' Bushes, Sight glass Bush Ring SPECIFICATION - PTFE The Specification applicable and followed to process & manufacture PTFE Products are as under : SHAPES 1. RAW POLYMER ASTM D-157 BS RODS D / THICK WALLED TUBES D /5130. THIN WALLED TUBES D MOULDED SHEET D D SKIVED SHEET / TAPE 7. MOULDED BASIC SHAPE 8. UNSINTERED TAPE
4 PTFE PRODUCT RANGE PRODUCTS STANDARD DIMENSIONS PTFE MOULDED ROD / ROUND BAR Dia 25mm 500mm Dia Length upto 500mm PTFE MOULDED BUSH, SLEEVE & HOLLOW BAR Custom made Outer & Inner Dia. Length 0, 300, 500mm long PTFE MOULDED SHEET Thickness 2.5mm to 0mm 2 Length & Width - 300mm to mm PTFE RAMEXTRUDED ROD / ROUND BAR 5mm DIA upto 0mm DIA, 900mm DIA, 00mm DIA, 2000mm DIA PTFE RAMEXTRUDED PIPE, SLEEVE, TUBE 25mm OD x 12.5mm ID to 0mm OD x 75mm ID Length upto 3300mm PTFE SKIVED SHEET, THIN SHEET 50mm Width to 1200mm Width Thickness 0.1mm to 3mm PTFE FLEXIBLE TUBING 0.8mm, 1mm, 1.5mm wall thickness in coil forms. PTFE CUT GASKET, RING GASKET To Suit Flange Standard Table E/F, ANSI-B #, 300#, 600# DIN Std., Size ½" NB to 28" NB (15NB - 700NB) Available in Raise Face & Full Face PTFE ENVELOPE GASKET 15 NB TO 750 NB Non Asbestos, Steel and Rubber Filled Insert. Slitted Type / V Type with Flap Thickness mm Milled / UType with Gap 1.5, 2, 3, mm Flape ( )mm PTFE VALVE COMPONENTS & PUMP COMPONENTS Seat Ring, Stem Ring, Body Ring, Plug / Sleeve Ring Note : Envelope Gasket available with Asbestos,
5 PRODUCTS STANDARD DIMENSIONS PTFE MACHINED COMPONENTS O/V/U Chevron Ring T Bushes, Bearing Bush in Two Half, Pully, Sparger, Beeker, Nut, Bolt & Washer PTFE BELLOWS Valve Bellow, Lined Bellow as per Customer Specification PTFE BALL / SPHERE 6mm DIA to 0 mm DIA PTFE PISTON RING PTFE GLAND PACKING Non Asbestos Packing 0% Pure PTFE Gland Packing 3mm Square & above Graphited/Carbon Blended PTFE Gland Packing. PTFE UNIVERSAL ROPE Size 3mm Round & Square onward Standard grades of material Of composition 1) 2) 3) ) Virgin PTFE Chemically Modified Virgin PTFE 15%-25% Glass Filled PTFE 5%/15% Glass + 5% MOS2 Filled PTFE 5) 6) 7) 8) 25% - 35% Carbon Filled PTFE 15% Graphite Filled PTFE 0%-60% Bronze Filled PTFE 55% Bronze + 5% MOS2 Filled PTFE Poly Ether Ether Ketone (PEEK) Products & Machined Components PEEK is a semi crystalline thermoplastic with a very stable chemical structure that offers critical advantages when compared to other materials. Properties: F High temperature resistance F Extended lifetime F Hydrolysis resistance F Excellent chemical resistance
6 PHYSICAL PROPERTIES PROPERTY TEST METHOD UNIT VIRGIN PTFE 25% GLASS 25% CARBON 15% GRAPHITE FILLED PTFE FILLED PTFE FILLED PTFE 0% BRONZE FILLED PTFE % BRONZE FILLED PTFE cm kg/cm² Conductive Conductive 7 PTFE is chemically inert & unaffected by all known chemicals except molten or dissolved alkali metals - Sodium, Potassium, Rubidium, Cesium, Francium & Fluorine Gas. Certain flourine compounds & complexes at elevated temperatures. Filled PTFE has inferior chemical resistance because of the presence of the particular filler. Note : Data quoted are average values only and should not be used as specifications for designing specific applications. Admn. & Factory : Gala No.137, Paras Industrial Estate, Ramchandra Lane Ext., Kanchpada, Malad (W), Mumbai Tel.: Telefax : shashifluoro@gmail.com Web. : / Regd. Off. : 171- SHIVALA, Road No.RSC-, Sect 5, Charkop, Kandivli (W), Mumbai Tel.: Authorised Distributor : Tel. : / Fax : viprotools@vsnl.net
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