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02-23-2012

Silicones for Highly Elastic Bonds

Reliable and Durable

Silicones for Highly Elastic Bonds

Wacker AG, Munich, Germany, has developed a biocompatible silicone adhesive for medical applications. Marketed under the brand name Silpuran 4200, this condensation-curing silicone rubber formulation is an easy-to-process, single-component adhesive with excellent adhesion properties. Upon vulcanization, Silpuran 4200 forms a silicone elastomer with outstanding mechanical strength, making it ideal for permanently bonding components of medical devices.

The new adhesive represents an expansion of the chemical company’s existing line of silicone products designed for use in the medical industry. Silpuran 4200 is formulated with a new catalyst that does not use organotin compounds. This makes this new silicone adhesive particularly safe to use from a health standpoint. Like all products in the Silpuran series, the new adhesive has also been certified as biocompatible in accordance with selected ISO 10993-1 and USP Class VI tests.

While Silpuran 4200 is particularly suitable for bonding vulcanized silicone parts, it can also be used to bond textile surfaces onto silicone. Molded parts made from these materials can be readily bonded without the need for advance priming. The vulcanized silicone adhesive layer can also support substantial mechanical loads. The vulcanizate shows medium hardness and elongation, it has good tensile strength and tear resistance. The elastic adhesive layer ensures a stable bond even when the bonded components move against each other. Silpuran 4200 is therefore not only suitable for permanently bonding device components, it is also an especially good choice for highly elastic bonds between the molded silicone parts and textiles used in manufacturing prosthetic and orthotic devices.

A pasty, self-leveling compound that shows shear thinning behavior, the new silicone adhesive can be applied manually or automatically and cured by exposure to air moisture. A skin forms in less than 10 minutes. Silpuran silicones contain no organic plasticizers, are resistant to radiation, can be readily sterilized and are certified for biocompatibility in accordance with selected ISO 10993 and USP (United States Pharmacopeia) Class VI tests. For ISO 10993 evaluation, materials are assessed for cytotoxicity, pyrogenicity and sensitization. USP Class VI evaluation encompasses tests for acute systemic and/or intracutaneous toxicity and short-term implantation.

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