Monohydroxy terminated polysiloxanes

Modifier OH 650 and 655 are mono-hydroxy-terminated polydimethyl siloxanes which are used as reactive plasticizers in condensation-curing silicones.
Due to the monofunctional structure, only one chain end of the Modifier OH reacts with the network, therefore it can not bleed out. The other loose end acts as a plasticizer: Modulus and hardness are reduced.