Modifier 705

SiH-terminated polydimethyl siloxane

Hanse Chemie

½ºÁ¬\ÅººÏ\¹Ì»¯¼Á >> ¹èÍé Crosslinking / Coupling / Curing Agents >> Silane ¹èÊ÷õ¥ Silicone Base Materials for 2-part Silicone Formulations Silicone-based 2-part formulations are used in many applications. These include dental impression materials and other elastic molds, as well as adhesives, coatings, casting and encapsulating materials for electrical and electronic applications. These are SiH-terminated polydimethyl siloxanes. Due to their difunctional structure, these products react with vinyl-functional silicone polymers not by curing, but by chain lengthening. The use of modifiers reduces the curing density and thus the hardness of the elastomer. Therefore, by using modifiers it is possible to attain relatively low Shore hardnesses even when using low-viscosity vinyl polymers. Our modifiers are thus used in formulations that need to be low-viscosity before curing and have a low Shore hardness after curing. This is difficult to achieve in conventional systems without chain extenders, since high-viscosity vinyl siloxanes are otherwise needed to achieve low hardness. Another important application is the formulation of silicone gels. SiH-terminated polydimethyl siloxane. Used as chain extender to react with vinyl-functional silicone polymers for the manufacture of addition curing formulation such as 2-part silicone formulation for coatings. Reduces curing density and hardness of elastomer.