Silane Terminated Polyether

Introduction

SiSiB® STP71320 is a highly reactive silyl-terminated polyether (STP) polymer designed as a base polymer in moisture-curing, medium-to-low modulus adhesives, sealants, and coatings. When exposed to atmospheric moisture, it reacts through hydrolysis and crosslinking to create highly durable elastomeric materials.

SiSiB® STP71320 offers a balanced combination of durability, reactivity, and storage stability. Adhesives and sealants formulated with this polymer exhibit broad adhesion, good mechanical strength, and deliver excellent flexibility, weather resistance, and environmentally friendly curing performance.

Properties

Features

• Medium to low modulus with high elasticity

  
  

• Excellent elastic recovery

• Excellent adhesion to various substrates without primer

• Fast curing

• Excellent weathering, aging, and yellowing resistance

• Outstanding water and chemical resistance

• Compatible with other STP polymers

• Solvent free, odorless, eco-friendly

• Excellent storage stability

Application

• Construction: Facade joints, window and door sealing, curtain wall panels, roof expansion joints

• Automotive: Body seams, glass installation, interior trim bonding

• Electronics: Joint sealing, moisture protection, thermal adhesive bonding

• DIY & Consumer: Kitchen & bathroom sealing, flooring joints, tile grouting

• Marine: Long-lasting, weather-resistant sealing for marine structures, boats, and ships

Processing

• SiSiB® STP71320 silyl terminated polyether readily dissolves in standard organic solvents but is virtually insoluble in water. Despite its highly reactive terminal groups, uncatalyzed STP71320 remains stable in air for several days. However, its reactivity with water or atmospheric humidity must be considered during storage and processing, as exposure may lead to slow condensation.

  
  

• SiSiB® STP71320 silyl terminated polyether can be processed using both hot and cold methods, and are suitable for both one component and two-component formulations. To prevent premature curing during formulation or exposure to moisture during storage, the addition of a water scavenger is recommended, SiSiB® PC6110 (vinyltrimethoxysilane) is commonly used.