Description

n-Butyltrimethoxysilane is a versatile organosilicon compound widely used as a coupling agent and surface modifier. Its primary value lies in its ability to form strong, durable bonds between inorganic substrates and organic polymers, enhancing composite material performance. This chemical is essential for manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for producers of advanced silica-based materials and mineral-filled composites.

Application

• Coupling Agent for Mineral-Filled Composites: Improves the dispersion and interfacial adhesion of fillers like silica, clay, and talc in polymer matrices such as polyethylene, polypropylene, and epoxy resins.
• Surface Treatment for Pigments and Fillers: Imparts hydrophobicity and improves compatibility with organic binders in coatings, inks, and plastics.
• Adhesion Promoter in Sealants and Adhesives: Enhances bond strength and durability, particularly on glass, metal, and mineral surfaces.
• Precursor for Silicone Modification: Serves as an intermediate in the synthesis of modified silicones and silane-functionalized polymers.
• Water Repellent for Construction Materials: Used in formulations for concrete, mortar, and stone protection to reduce water absorption.
• Fiberglass Sizing Agent: Improves the interfacial shear strength between glass fibers and resin in reinforced plastics.

Basic Information

Product Name	n-Butyltrimethoxysilane
CAS No.	1067-57-8
Molecular Formula	C7H18O3Si
Molecular Weight	178.30 g/mol
Synonyms	Butyltrimethoxysilane; n-Butyltrimethoxy silane; Trimethoxy(butyl)silane; Butyltrimethoxysilane; Silane, butyltrimethoxy-; 1-Butyltrimethoxysilane; BTMS; n-BTMS
EINECS	213-928-5

Quality Control

Our n-Butyltrimethoxysilane is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications. A comprehensive Certificate of Analysis (COA) detailing assay, purity, and impurity profiles is provided with each shipment to guarantee consistency and support your quality assurance protocols.

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 highly volatile; containers must be kept tightly sealed and away from heat, sparks, and open flame. Use under an inert atmosphere (e.g., nitrogen) for extended storage or after partial use to prevent moisture uptake and hydrolysis.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Density (at 20°C)	0.90 - 0.92 g/mL
Refractive Index (n20D)	1.390 - 1.395
Water Content (Karl Fischer)	≤ 0.5%

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