Description

Bis[3-(Trimethoxysilyl)Propyl] Maleate is a specialized organosilane coupling agent featuring dual maleate and trimethoxysilyl functional groups. This unique bifunctional structure enables it to act as a powerful adhesion promoter and crosslinker, forming durable bonds between organic polymers and inorganic substrates. It is essential for manufacturers in the silicone rubber, adhesives, sealants, and coatings industries seeking to enhance product performance, durability, and weather resistance.

Application

• As a key crosslinking agent and adhesion promoter in silicone rubber and RTV sealants.
• To improve the bonding strength and water resistance of epoxy, polyurethane, and acrylic-based adhesives.
• As a surface modifier and coupling agent in mineral-filled composites (e.g., filled plastics, rubber) for better filler dispersion and mechanical properties.
• In the formulation of high-performance, weather-resistant protective coatings and paints for metals, glass, and concrete.
• For the surface treatment of glass fibers and minerals to enhance compatibility with polymer matrices.
• As a reactive intermediate in the synthesis of specialized silane-modified polymers (SMP) and hybrid materials.

Basic Information

Product Name	Bis[3-(Trimethoxysilyl)Propyl] Maleate
CAS No.	3090-21-9
Molecular Formula	C20H38O10Si2
Molecular Weight	494.68 g/mol
Synonyms	1,2-Bis(3-(trimethoxysilyl)propyl) maleate; 3-(Trimethoxysilyl)propyl maleate dimer; Maleic acid bis(3-(trimethoxysilyl)propyl) ester; Bis(3-trimethoxysilylpropyl) maleate; Silane coupling agent KH-570 (related); SCA-MPTMS; A-174 (maleate derivative); Silquest A-174 (maleate variant)
EINECS	221-425-6

Quality Control

Our production of Bis[3-(Trimethoxysilyl)Propyl] Maleate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, purity verification, and functional group analysis, to ensure consistency and performance. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	Clear to pale yellow liquid
Identification (IR)	Conforms
Assay (GC or Titration)	≥ 95.0%
Refractive Index (n20D)	1.440 - 1.450
Density (g/mL, 25°C)	1.05 - 1.15
Moisture (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.