Jan/Feb 2025 Continued from previous page
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out in N/mm or pounds per inch. A Cohesive failure (R) is one in which
the bond is maintained and the LSR portion of the sample has a failure, or the plastic sub- strate has a failure as well. This means that the bond is so strong that the material itself fails before the bond does. Opposite to cohe- sive failure is the adhesive failure mode, in which the bond is not maintained and the LSR portion delaminates from the substrate. This means that the bond is weaker than the material itself, and the bond breaks before the material does. ELASTOSIL LR 3078 is a material that
not only meets but exceeds expectations. From 2K molding to insert molding with polycarbonate, it delivers excep- tional performance. For critical applications that demand the best bonding, ELASTOSIL LR 3078 offers excellent adhesion and cohe- sive strength, without the need for surface priming. It is also ideal for applications that require repeated sterilization cycles in the medical field, providing a reliable and durable solution.
Easy Processing All grades of the new product
line can be easily processed by two-component injection molding.
ELASTOSIL LR 3078
offers excellent adhesion and cohesive strength, without the need for surface priming.
They do not contain any sub- stances that could result in solid deposits forming in the mold dur- ing processing, ensuring that the injection molding machine runs without interruptions. The ELASTOSIL LR 3078
product line comprises the hard- ness grades 20-70 Shore A and thus covers the hardness range necessary for the soft component of hybrid parts. All grades are translucent and can be colored as desired. Excellent mechanical properties characterize the cured products. They achieve a very low compression set. This is ideal for sealing applications. When relaxed after being compressed at high temperatures, a part molded with ELASTOSIL LR 3078 will only show a small amount of deformation, thanks to the material’s elasticity. Sealing lips made of ELASTOSIL LR 3078, therefore, retain their func- tion over the long term. Cured ELASTOSIL LR 3078
products have passed selected tests for biocompatibility accord- ing to ISO 10993 and US Pharmacopeia Chapter <88>, Class VI. They can also be steam- sterilized repeatedly at 273.2°F (134°C) without losing mechani- cal properties or adhesion to polycarbonate. Therefore, the new liquid silicones are also suit- able for manufacturing two-com- ponent parts for medical devices.
Tensile test.
WACKER Develops Self-Adhesive Liquid Silicone Rubber Due to the fast curing of the new liquid
silicone rubber grades, injection molding cycle times are very short. In addition, devices with complicated geometric shapes can be produced with high precision and without secondary finishing. ELASTOSIL LR 3078 thus opens the way for further miniaturization of polycarbonate-silicone hybrid parts and new product designs. Contact: Wacker Chemical Corporation,
4950 South State Street, Ann Arbor, MI 48108 % 734-546-4951 E-mail:
james.barnes@
wacker.com Web:
www.wacker.com r
See at MD&M West, Booth 1815
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