Medical device adhesives bond TPE/TPU
Rocky Hill, Connecticut – Henkel Corp. has introduced two new high-elongation, high-flexibility, LED-curable adhesives specifically designed for use on flexible medical devices made of TPE and TPU – substrates increasingly specified by medical device manufacturers – as well as plasticized PVC. With fixture times of one to three seconds using a LOCTITE high-output LED curing system, Loctite AA3951 and Loctite AA3953 minimize curing delays and eliminate work-in-progress. These adhesives deliver elongations greater than 200% and bond strengths greater than 450 PSI on polycarbonate, acrylic, and hard-to-bond materials such as HDPE and LDPE.
As Loctite AA3951 and AA3953 fluoresce in both their uncured and cured states, adhesive detection for quality control is quick and easy with the use of a black light or vision system. These highly flexible adhesives are designed for assembling a range of disposable medical devices including tube sets, IV sets, respiratory circuits, catheters, fluid containers, and certain reusable devices such as endoscopes. Both adhesives have been tested to Henkel’s protocols based upon ISO-10993 biocompatibility standards, with certificates available on request.
Loctite AA3951 has a viscosity of 100cP and can fill gaps up to 0.005", while the viscosity of Loctite AA3953 is 500cP, allowing it to fill gaps as large as 0.120". Both colorless adhesives can withstand medium to high humidity levels and perform well in operating temperatures from -65°F to 300°F.