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Fluoropolymeres - Basis of our Products. Fluoropolymeres  Material properties  Resistance to chemicals  Surface condition  Purity (Leaching)  Permeation.

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Presentation on theme: "Fluoropolymeres - Basis of our Products. Fluoropolymeres  Material properties  Resistance to chemicals  Surface condition  Purity (Leaching)  Permeation."— Presentation transcript:

1 Fluoropolymeres - Basis of our Products

2 Fluoropolymeres  Material properties  Resistance to chemicals  Surface condition  Purity (Leaching)  Permeation  PTFE  TFM-PTFE  PFA

3 Fluoropolymeres  Outstandig chemical stability  Service temperatures up to 260°C  Extremely anti-adhesive, smooth surface  Ultra-high purity  Superior electrical insulator  Hydro-phobic

4 Fluoropolymeres - Material Properties -[CH 2 -CF 2 ] n - -[CF 2 -CF 2 ] n - PP PVDF PTFE TFM PFA Fluorine Carbon Oxygen Fluorine Carbon Oxygen Fluorine PTFE TFM PFA

5 Composition and Poperties of PTFE  Perfluorinated plastic with melting point of 327 °C, molecular weight approx g/mol  Complete protection of C-C-bonds by F-atoms  Processable by pressing, sintering and chip removing technics  Nearly universal resistance to chemicals  Service temperature: °C to °C  High purity, excellent dielectrical properties  No embrittlement, no aging

6 Composition and Poperties of modified PTFE: TFM-PTFE  Molecular weight is about 1/5 of the molecular weight of PTFE  Contains the same perfluorinated modifier as PFA, but less than 1 %  Therefore TFM-PTFE closes the cap between classical PTFE and PFA  Weldable by special technics, thanks to the „shift versus thermoplastic properties“  Cold-flow, pore content and stretch-void-index are improved

7 Composition and Poperties of PFA  Thermoplastic processable perfluorinated polymere  Molecular weight approx. 1 % of PTFE, therfore processable by fusion  4 to 10 % modifier  melting point: 305 to 290°C  Highly modified  highly amorph: high transparency, improved alternate bending and good chemical resistance to stress crack  Chemical stability and service temperature comparable with PTFE  Processing methods: injection molding, extrusion, transfer molding  Thermoplastic processing technics open up new applications for this „material with PTFE-properties“

8 Fluoropolymeres - Material Properties PTFETFMPFAPVDF temperature range [°C] totototo persistence to chemicalsvery highvery highvery highhigh; reacts with strong bases (NH 3 ) molecular weight~ 10 8 g/mol 2 x 10 7 g/mol 10 6 g/mol tensile strength N/mm 2 41 N/mm N/mm N/mm 2 (ISO )

9 Fluoropolymeres - Resistance to Chemicals ChemicalEffect fluorinated hydrocarbons swelling, reversible at short-term exposition alkali metals, dissolved or molten elimination of fluorine and polymere decomposition halogenes, elemental fluorine, chloro trifluoride chem. reaction possible at elevated temperatures, material decomposition, possibly violent reaction nitrating acid (H 2 SO 4 / HNO 3 ) above 100°C slow material decomposition, carbonisation monomeres: styrene, butadiene, acrylnitrile... could penetrate into the material; at spontanous polymerisation: swelling or polymere decomposition. popcorn-effect high-energy radiation  -radiation: dose of 10kGy could reduce the mechanical properties by more than 50%

10 Fluoropolymeres - Surface Condition Chip removing production without polishing Injection molding PTFETFMPFA

11 Fluoropolymeres - Purity (Leaching of Fluoropolymeres) Extraction time:2 days Medium:2% HNO 3 Temperature:20 °C Result:ng/cm 2 PTFETFMPFA-HP Mg2,581,401,18 Al3,732,205,00 Li< 0,0002< 0,0002< 0,002 B0,0850,091< 0,01 F Na18,1010,005,38 P< 4< 4< 5 S Cl K18,4010,005,32 Ca21,9011,0014,00 Cr0,0850,100,19 Mn0,098< 0,002< 0,002 Fe5,043,102,97 Ni0,630,38< 0,003 Cu21,424,30,049 Zn6,434,001,23 Br445 Mo0,310,061< 0,001 Pb2,521,800,33

12 Fluoropolymeres - Purity (Leaching of PTFE-TFM) Conclusion:  Purity in accordance with specification for PFA-HP  lower concentrations of Cr, Ni, Mo than in PFA-HP Conditions:  2 mm plate material  2% HNO 3, 49% HF :20 °C, 7 days  DI water 80°C, 7 days

13 Fluoropolymeres - Permeation Permeation in Thickness in µm cm³ m²·day·bar  Permeation of HCl-Gas at 100°C

14  Permeation of water vapour at 100°C Thickness in µm Permeation in cm³ m²·day·bar Fluoropolymeres - Permeation

15 Your Benefit  Hiogh competence through in house production  Customized solutions possible  PTFE and TFM-PTFE comparable with PFA  Solid, longevity PTFE-TFM-products (inserts, pressure vessels etc.)


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