Breakthrough in Domestic STP-E Polymers: Performance Now Matches Leading International Brand GENIOSIL® STP-E35

Jan 29, 2026

Product Name: Silane Terminated Polyether Polymer
Item No.: SilibaseSTPE-A22T
A breakthrough has been achieved in the domestic production of silane-terminated polyether polymers, with a new product from a Chinese manufacturer now offering performance fully comparable to the international benchmark, GENIOSIL® STP-E35.SilibaseSTPE-A22T is alkoxy silane terminated polyether polymer. It could be applied in moisture curing elastic sealant, elastic structure sealant and sealing coatings. Sealants based on SilibaseSTPE-A22T not only have excellent adhesion properties, but also have adhesion to broad range of substrates. Different from polyurethane and silicone system, this formulation have no solvent and isocyanate, as well as no bubbles and odour generated from curing. It is especially suitable for construction industry, transportation industry and general industry application.

Properties and Features
High Activity , Medium-High Modulus
High transparence
Good adhesion strength and tensile elasticity
Fast curing , non-tin catalysts used if needed, more eco-friendly
Excellent aging and yellowing resistance
Excellent water resistance , resistance to chemical corrosion
Excellent storage stability
Solvent free , odourless , eco-friendly
Could be blended with other Risun polymers

Physical Data
Item Parameter
Polymer Type Silane terminated polyether
Appearance Pale yellow transparent liquid
Boiling Point ＞250℃
Gravity 1.0 g/cm3
Viscosity 35000-55000 mPa·s (25℃)
Flash Point ≥237℃
Water-Soluble Virtually Insoluble
Shelf Life ≥12 months（25℃/50% RH）

Applications
This China-made polymer not only provides a more competitive price but also matches key performance metrics of its international counterpart. It features a high modulus, fast curing, and excellent weather resistance, making it a compelling and reliable alternative.SilibaseSTPE-A22T polymer is used as base polymer in elastic sealants, elastic structure sealants, encapsulate adhesives and coatings . The curing mode of the polymer is moisture
curing, It can be made into a single component or two-components system.
◼ High Modulus sealant
◼ Transportation industry elastic sealant
◼ Personal DIY sealant
◼ Industrial sealant
◼ Eco-friendly decoration sealant
◼ Building & Construction Adhesives
◼ Flooring Installation
◼ Home-Improvement Gluing
◼ Silane Modified Polymers

Instructions

The successful launch and supply of this high-performance substitute mark a significant step forward for China's advanced materials sector, demonstrating its capability to produce world-class polymer solutions.SilibaseSTPE-A22T polymer can be quickly dissolved in ordinary organic solvents (such as ethanol), but almost insoluble in water. So the raw materials in the formula system are mostly oil-soluble substances. SilibaseSTPE-A22T polymer curing mechanism, silane of both ends with the help of the catalyst react with water forming hydrolysis to generate Silanol, Silanol is crosslinked with catalyst to form a siloxane bond, resulting in a network-like structure. Water is a very important factor during the storage and processing.In order to stabilize the processing and storage, it must add a certain amount of chemical water removal agent, we recommend the use of vinyl trimethoxysilane. Conventional mixing process can be suitable for SilibaseSTPE-A22T POLYMER. For more technical support, please consult our technical engineers.Choosing this domestic alternative enables industries to access top-tier performance while optimizing supply chain costs and enhancing sourcing flexibility.

Cleaning
This product can be removed before curing by the general solvent, such as ethanol, dimethyl carbonate. After curing can only be removed by mechanical means.

Safety
Please refer to the Safety Data Sheet (SDS)

Storage
Because this product is moisture sensitive, If unopened and stored at 4℃-30℃ dry environment, the shelf life is 12 months. Use it as soon as possible if opened, the remain
products should be resealed and stored at 4℃-30℃ dry environment. But if shelf life expired, you can still use it only after your positive confirmation of production performance.

Package
◼ 200kg drum lined with aluminum foil bag
◼ 1000kg IBC