PTFE TECHNOLOGY AND PTFE PRODUCTION PROGRAMME PTFE VALVES Types of fittings Types of coatings Materials of steels • Ball valves • PTFE • Carbon steel: 1.0038 • Butterfly valves • PFA • Stainless steel 1.4301, 1.4571 • Check valves • FEP • Sight glasses • PTFE ANTISTATIC • Pipeline components • PFA - C ANTISTATIC PYRAMID DIAGRAM OF MOST USED ENGINEERING PLASTICS ADVANCED ENGINEERING PLASTICS c High temperature 300ºC 1 Superior chemical resistance Good wear resistance PI ature plasti r PAI PEKEKK PEEK, PEK PES, PPSU LCP, PPS High tempe PEI, PSU PTFE, PFA PPP, PC-HT ETFE, PCTFE PVDF ENGINEERING PLASTICS c Good chemical resistance 150ºC 2 General purpose Bearing & wear PA 46 PET, PBT PC PA 66 PA 6-3-T PA 6, PA 11, PA 12 Engineering plasti POM 100ºC PMP STANDARD PLASTICS c 3 Non-critical applications PPE mod. Standard plasti PMMA PP Long term service temperature PE PS, ABS, SAN Amorphous Semi-crystalline PTFE ( Polytetrafluoroethylene) is made of a carbon backbone chain. Each carbon has two fluorine atoms attached to it, like PTFE shown on picture below. F F F F F F F F F F C C C C C C C C C C F F F F F F F F F F The base characteristics of PTFE are the ones that offering a unique combination of: • Low coefficient of friction • Excellent chemical inertness • Extremely good chemical resistance to almost all chemicals • Non-adhesive surface • Wide temperature range withstanding (-200°C to + 260°C) • Melting point 327°C • Excellent dielectric properties. PTFE 3D • PTFE is a linear and fully F F fluorinated high molecular weight polymer. C C • The extremely strong car- Molecule F F bon fluorine bonds inPTFE impart an outstanding combination of properties to PTFE. • PTFE is hydrophobic, Fluorine liquids will not wet PTFE as it has a high Carbon Polymer • electronegativity. Description Explanation Result The fluorine atoms form a protective sheath Shielding the carbon chain from attack by Chemical and thermal stability. arround the chain of carbon atoms chemicals Reducing the surface energy Low coefficient of friction Reducing the surface energy Non-stick properties PTFE FILLERS Where the most critical operating conditions are present, even the ex- cellent performances of virgin PTFE can not always fulfil the user`s expectations. A range of fillers, typically glass fibre, carbon, graphite, bronze can be blended with PTFE resins, usually in the proportion of 2 - 40%, to improve certain characteristics. The incorporation of fillers can: • Increase compressive strength • Improve thermal conductivity • Improve abrasion resistance • Reduce thermal expansion • Reduce coefficient of friction • Impart electrical conductivity It should be noted that the use of fillers may downgrade other properties of PTFE such as chemical and electrical resistance. Low Friction RAM EXTRUSION 1 Products 2 Powder feeding 3 Pressing cylinder for moving the ram 4 Retracting cylinder for retracting the mandrel (in tube production) 5 Ram for compressing the powder 6 Extrusion pipe 7 Heating sleeves for heating the extru sion pipe 8 Drive for the stirring device 9 Movable mandrel FEP Fluorinated ETHYLENE propylene F F F F C C C C F F F F n m F F F F F F • Melt-processable fluoropolymer -> injection molding • Melting point 260-270°C C C C C C C • Service temperature from -200°C to +205°C • Mechanically, FEP is slightly more flexible than PTFE F F F F F • Appearance: Highly transparent CF3 • FEP is softer than PTFE • FEP has inferior mechanical and thermal properties than PTFE • Resistant to sunlight PFA PERFLUOROALKoxy ALKANE F F F F C C C C F F F O n m F C F F • Melt-processable fluoropolymer -> injection molding • Melting point 305°C • Service temperature from -200°C to +260°C • Similar chemical resistance to PTFE • Much lower porosity than PTFE F F F F F F • Appearance: Translucent (virgin), deep black (conductive). • Comparison with PTFE: Equivalent thermal and chemical resistance, superior properties with respect to processability, C C C C C C translucency, permeation resistance and mechanical strength. • Material with well-defined melting point – the granulate is F F F O F F melted in a melt pot and then forced into the hot tool by a hy draulic press. Rf • Permeation: PFA gives better barrier properties than PTFE SAMPLE OF PRODUCTS LINED WITH FEP/PFA MATERIAL INJECTION MOLDING Substance groups ETFE PFA, FEP FLPE PTFE FLPP HDPE LDPE PC PETG PP PVC at 25°C Acids, dilute or weak E E E E E E E E G E E Acids,strong/conc. E E G E G G G G F G G Alcohols,aliphatic E E E E E E E G G E G Aldehydes E E G E G G G G G G G Bases/Alkali E E F E E E E G N E E Esters G E G E G G G F G G N Hydrocarbons,aliphatic E E E E G G F F G G G Hydrocarbons,aromatic G E E E N N N N N N N Hydrocarbons,halogenated G E G E F N N N N N N Ketones,aromatic G E G E G N N N N N F Oxidizing Agents,strong E E F E F F F F F F G Some effect after 7 days of constant exposure 30 days of constant exposure causes no damage. E F (cracks,loss of strength,discoloration). G Little or no damage after 30 days of constant exposure. N Not recommended, immediate damage may occur. THE PRODUCTION PROGRAMME PTFE BALL VALVES DN15 ÷ DN250 NPS1/2” ÷ NPS10” PN6 ÷ PN40 CLASS 150 -50°C ÷ +200°C PTFE BUTTERFLY VALVES DN50 ÷ DN600 NPS2” ÷ 24” PN16 CLASS 150 -50°C ÷ +200°C PTFE CHECK VALVES DN15 ÷ DN400 NPS1/2” ÷ NPS16” PN6 ÷ PN40 CLASS 150 ÷ CLASS 300 -50°C ÷ +200°C PTFE SIGHT GLASSES DN15 ÷ DN100 NPS1/2” ÷ NPS4” PN6 ÷ PN40 CLASS 150 -50°C ÷ +200°C PTFE PIPELINE COMPONENTS DN15 ÷ DN250 NPS1/2” ÷ NPS10” 1 Pipes 2 Elbows PN6 ÷ PN40 CLASS 150 -50°C ÷ +200°C 3 T-joints 4 Compensators Headquarters 39-307 Gawłuszowice Brzyście 35 POLAND tel.: +48 17 785 28 93 [email protected] www.andrex-vg.com.