Description

Mercaptopropylsilane is a bifunctional organosilicon compound featuring a reactive mercapto (thiol) group and a hydrolyzable silane moiety. This unique structure makes it a critical coupling agent and surface modifier, enabling strong bonds between inorganic materials and organic polymers. It is essential for industries requiring enhanced adhesion, durability, and performance in composite materials. Key applications include its use as a silane coupling agent in filled plastics, rubber, adhesives, and as a surface treatment for glass and minerals.

Application

• Silane Coupling Agent: Promotes adhesion between inorganic fillers (e.g., silica, glass fibers, minerals) and organic polymer matrices in composites, plastics, and rubber, improving mechanical properties and moisture resistance.
• Surface Modification: Treats glass, metals, and other mineral surfaces to introduce thiol functional groups, enhancing compatibility with organic coatings, inks, and adhesives.
• Rubber Reinforcement: Acts as a key ingredient in the production of silica-filled "green tire" compounds, improving filler dispersion, reducing rolling resistance, and enhancing tire durability.
• Adhesive & Sealant Formulation: Serves as an adhesion promoter and crosslinking agent in polysulfide and polyurethane-based sealants and adhesives, improving bond strength and elasticity.
• Resin & Plastic Modification: Used as an additive in epoxy, phenolic, and other thermosetting resins to modify properties and improve filler-matrix interactions.
• Intermediate for Further Synthesis: The reactive thiol group serves as a versatile building block for synthesizing more complex organosilane derivatives and functional materials.

Basic Information

Item	Details
Product Name	Mercaptopropylsilane
CAS No.	4756-00-7
Molecular Formula	C3H8SSi
Molecular Weight	104.23 g/mol
Synonyms	3-Mercaptopropylsilane; (3-Mercaptopropyl)silane; 3-Mercaptopropyltrihydroxysilane (hydrolyzed form); Mercaptopropyltrihydroxysilane; SH-Si coupling agent; Thiopropylsilane; γ-Mercaptopropylsilane; Silane coupling agent KH-590 (common trade name reference)
EINECS	225-296-4

Quality Control

Our Mercaptopropylsilane CAS NO 4756-00-7 is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and performance. Certificates of Analysis (COA) documenting key parameters are provided to guarantee consistency and traceability for your formulation needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) and minimize exposure to air and moisture during handling.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.440 - 1.445
Density (20°C)	0.98 - 1.02 g/mL

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