At this year’s COMPAMED medical-technology trade fair, WACKER, the Munich-based chemical group, showcased a new self-adhesive liquid silicone rubber (LSR) that has a low coefficient of friction. SILPURAN® 6760/50 cures to form an elastomer with a low-friction surface, a property which enables self-adhesive LSRs to be used in novel applications. The silicone adheres readily to selected polyesters such as polybutylene terephthalate (PBT). SILPURAN® 6760/50 has been designed for injection molding, making hard/soft components for medical and pharmaceutical applications suitable for cost-effective large-scale production. COMPAMED took place in Düsseldorf, Germany, from November 14-17.
SILPURAN® 6760/50 is a self-adhesive liquid silicone rubber (LSR) which has a low-friction surface after curing. Tests show that the product’s coefficient of friction is 50 to 70 percent lower than that of standard LSRs with a comparable hardness. The Munich-based chemical company premiered the new product at this year’s COMPAMED trade show.
SILPURAN® 6760/50 was specifically designed for the production of parts comprising hard/soft combinations such as those used in the pharmaceutical and medical sectors
SILPURAN® 6760/50 is an addition-curing silicone rubber. It has two components and, once mixed, cures to form a transparent, mechanically robust elastomer with a 50 Shore A hardness. After postcuring, the vulcanizate has a coefficient of friction which is between 50 and 70 percent lower than that of standard LSRs of comparable hardness. This makes it possible to use liquid silicone rubber in movable-seal applications. The low coefficient of friction also facilitates the fitting of silicone components into medical devices.
SILPURAN® 6760/50 was specifically designed for the production of parts comprising hard/soft combinations such as those used in the pharmaceutical and medical sectors. They are often made from a hard thermoplastic, which determines the shape, encased in a soft plastic layer. SILPURAN® 6760/50 can be used to cost-effectively injection mould these kinds of parts in large series.
Self-adhesive SILPURAN® 6760/50 liquid silicone rubber was specifically developed for medical- technology and pharmaceutical applications. After curing, it has good mechanical properties and a low-friction surface. (Photo: Wacker Chemie AG)
As a self-adhesive grade, SILPURAN® 6760/50 does not need any adhesion promoter. It adheres readily to selected polyesters, such as polybutylene terephthalate (PBT), a thermoplastic often used in injection molding.
SILPURAN® 6760/50 meets selected test requirements of ISO 10993 and United States Pharmacopeia (USP) Class VI. Postcured parts are suitable for food-contact applications and can be used under the recommendations of the German Federal Institute for Risk Assessment (BfR) and the US Food and Drug Administration (FDA).
The manufacturing process for all SILPURAN® silicone products entails ultrafine filtration, visual inspection and cleanroom packaging in antistatic materials. This ensures that SILPURAN® meets the special purity requirements of the food and medical-technology sectors.