Henkel Corp. (Rocky Hill, CT) has released singlecomponent light- and moisture-curing silicone adhesives for use on medical devices that incorporate silicone materials or require flexible bond joints or coatings. The adhesives cure within 30 seconds on exposure to a suitable UV/visible light source. They eliminate part racking and allow immediate quality control testing. The adhesives provide high-bond strengths on silicone and plastics such as polycarbonate, and demonstrate tear strengths in excess of 50 pounds per inch and elongation of more than 140% in the cured state. They can be used on catheters, respiratory devices and connections, medical tubing, and tracheotomy devices.

Loctite® 5055™ is a low-viscosity, light yellow, transparent liquid that provides adhesion to polycarbonate and tensile strengths of nearly 1500 psi. Loctite® 5056™ provides heat and humidity resistance in its cured state. Loctite® 5240™ is a UV/visible light curing silicone that offers a secondary moisture cure that takes place in shadowed areas in 24 to 72 hours. It cures to depths of 0.75" and delivers a colorless bond line. All three silicones meet ISO-1093 biocompatibility requirements for medical device assembly.

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Topics:
Materials Medical Plastics Tubing/Extrusion/Molding

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    This article first appeared in the May, 2009 issue of Medical Design Briefs Magazine (Vol. 33 No. 5).

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