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Silicone Rubber, Future material for todays applications

Silicone Rubber, Future material for todays applications

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Silicone Rubber, Future material for todays applications

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  1. Silicone Rubber, Future material for todays applications Peter Gustafsson Wacker Nordic

  2. SILICONE ELASTOMERS –A WEALTH OF OUTSTANDING PROPERTIES • heat stability 180 °C , 300 °C peak temperature) • down to -50 °C, special grades -110 °C • color • flame retardance • low compression set • sun, weathering, UV resistance Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 1

  3. NO CRITICAL ADDITIVES ARE REQUIRED FOR SILICONE ELASTOMER’S EXCELLENT MATERIAL CHARACTERISTICS • Only contain : siloxanes, silica, crosslinker/catalyst • No organic stabilizers, organic impurities, preservatives, animal-derived products and genetically-modified organisms • No plasticizers or softeners like phthalates •  medical and pharmaceutical articles Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 2

  4. CH CH3 CH2 O Si Si O CH3 CH3 n m SILICONE ELASTOMER‘S OUTSTANDING PROPERTIES CAN BE EXPLAINED BY THE SILOXANE POLYMER STRUCTURE • inorganic, inert polymer backbone • low surface energy • high polymer flexibility • Bonding Bonding Energy in kJ/mol • Si - O 444 • C - O 339 • C - C 348 • Energy of Sunlight (300 nm) 398 Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 3

  5. SILICONE ELASTOMERS –CLASSIFICATION BY CHEMISTRY Silicone Elastomer High temperature curing Room temperature curing Solid Silicone Rubber Liquid Silicone Rubber Two components One component HCR LSR RTV-2 RTV-1 moisture curing Condens. curing Addition curing Platinum curing Peroxide curing Platinum curing Tin-catalyzed Tin-catalyzed Platinum-catalyzed Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 4

  6. MECHANICAL PROPERTIES QUALIFY SILICONE RUBBER FOR A VARIETY OF APPLICATIONS RTV-2 00–50 ShA 3–6 N/mm2 400–600% 8–25 N/mm 40–70% 20–50% LSR 3–80 ShA 5–9 N/mm2 300–800% 15–45 N/mm 10–50% 40–60% HCR 10–90 ShA 6–11 N/mm2 300–1200% 20–55 N/mm 10–40% 35–65% hardness (DIN 53505) tensile strength (DIN 53504 S1) elongation at break (DIN 53504 S1) tear resistance (ASTM D 624) compression set (DIN ISO 815-B)* rebound resilience (DIN 53512) * determined at 175 °C, 22 h Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 5

  7. LIQUID SILICONE RUBBER VS. HIGH CONSISTENCY RUBBER LSR HCR • advantages • short cycle time • fully automated injection molding process • molds with up to 128 cavities • complex part geometries possible • 2-compentent injection molding possible • advantages • better mechanical properties, - various processing techniques • - compression molding • - extrusion • - calendering Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 6

  8. SILICONE ELASTOMER‘S BIOCOMPATIBILITY AND BIODURABILITY ARE ESSENTIAL FOR HEALTHCARE APPLICATIONS • biocompatibility • biodurability • sterilizability • high purity • extensive history, 60 years • high transparency • do not support the growth of microbes • uncritical disposal: no toxic fumes Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 7

  9. SILPURAN®– WACKER‘S PRODUCT LINE FOR MEDICAL AND PHARMACEUTICAL APPLICATIONS • all SILPURAN grades meet the requirements of USP Class VI and selected tests of ISO 10993: • Cytotoxicity • Systemic toxicity • Sensitisation • Intracueaneous toxicity • Pyrogenicity • Implantation (30 d) • further certificates, e.g. haemolysis, thrombogenicity, implantation for 90 days, acute dermal irritation are available for selected grades Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 8

  10. HARD-SOFT COMPOSITS ARE AVAILABLE BY USING SELF-ADHESIVE GRADES Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 9

  11. THE 1-STEP METHOD ON A SINGLE INJECTION MOLDING MACHINE • Multi-component injection molding machine (TP and LSR molding) • Rotary injection mold with two sprues and thermal separation • or • parallel molds with handling • Injection molding in one operation • 1 Inject thermoplastic Thermal separation • 2 Rotate • 3 Inject silicone • 4 Rotate Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 10

  12. LOW COEFFICIENT OF FRICTION GRADES EASE THE ASSEMBLY OF COMPLEX DEVICESCOEFFICIENT OF FRICTION IS REDUCED BY 50–75% Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 11

  13. Environmental compatibility Effect on ecosystem Silicones mainly enter the environment in the form of fluids and emulsions. No adverse effects on ecosystems have been reported. Microbes slowly degrade the silicones to silanols and other, partly cyclic compounds. Under the influence of UV light and nitrates, some silicones are transformed into SiO2. Disposal and incineration Silicone waste can also be safely disposed of and incinerated together with domestic waste. Incineration only produces carbon dioxide, water and sand (silicon dioxide). This also proves to be an advantage in the event of fire – unlike other polymers, the combustion products are harmless. PVC, for example, produces dangerous hydrogen chloride gas and dioxins when it burns, and normal rubber releases considerable quantities of sulphur dioxide when it burns. Since silicone products are free of chlorine and sulphur, they pose much less risk than other comparable polymers in the event of fire. Effect on human organism Silicones are to be found in nearly all areas of everyday life because they have so many positive properties. A significant property is their extremely low order of toxicity to the human organism. That is why they are widely used in cosmetics and medical technology. Presentation Title First Name Last Name, Organizational Unit, Date of Presentation, Slide 12