POLYMER ST 61 is a silane-terminated polymer used for formulations meeting high performance demands. It provides a high degree of flexibility for formulations allowing high strength and hardness as well as soft formulations with high elasticity. POLYMER ST 61 allows high dosages of fillers without compromising tensile strength. This allows formulations to meet requirements for various applications. Its benefits include allowing the mechanical performance of formulations to incorporate high levels of fillers while maintaining tensile strength. POLYMER ST 61 is activated by catalysts or moisture initiating reaction for superior bonding and durability important for related industries.