Keywords

• n-Dodecyltrimethoxysilane china manufacturer
• Dodecyltrimethoxysilane CAS 3069-21-4 supplier
• water repellent silane silane for coatings silane for construction

Quick Details

• ProName: n-Dodecyltrimethoxysilane CAS 3069-21-...
• CasNo: 3069-21-4
• Molecular Formula: (CH3O)3SiCH2(CH2)10CH3
• Appearance: colorless transparent liquid
• Application: ? Water repellent treatment for concre...
• DeliveryTime: 10-15 days
• PackAge: 200L steel drums; 1000kg IBC container
• Port: Shanghai China
• ProductionCapacity: 20 Metric Ton/Month
• Purity: 97%
• Storage: Must be sealed and kept in cool and ve...
• Transportation: by sea
• LimitNum: 25 Kilogram
• Purity: ≥97%
• Density (25°C):: 0.88–0.92 g/cm3
• Refractive Index:: 1.420–1.430
• Hydrolyzable Chloride: : ≤0.05%

Superiority

Why Choose Our n-Dodecyltrimethoxysilane (CAS 3069-21-4)?

1. Excellent Hydrophobic Performance  
Long alkyl chain provides superior water repellency for construction and coating applications.

2. Stable Quality & Purity  
Purity ≥97% with controlled hydrolyzable chloride, ensuring consistent industrial performance.

3. Strong Surface Modification Ability  
Improves compatibility between inorganic materials and organic systems.

4. Wide Application Range  
Suitable for coatings, paints, fillers, and construction materials.

5. Reliable Supply  
Stable production with fast delivery within 10–15 days.

Applications of n-Dodecyltrimethoxysilane:

• Water repellent treatment for concrete, stone and building materials  
• Hydrophobic additive in coatings and paints  
• Surface modification for fillers and mineral powders  
• Construction waterproofing systems  
• Moisture protection for porous substrates  

Typical Technical Data

Appearance: Colorless transparent liquid
Purity: ≥97%
Density (25°C): 0.88–0.92 g/cm³
Refractive Index: 1.420–1.430
Hydrolyzable Chloride: ≤0.05%

Details

N-Dodecyltrimethoxysilane

CAS No. 3069-21-4 | Alkyl Silane Coupling Agent Manufacturer

Product Overview

N-Dodecyltrimethoxysilane (CAS 3069-21-4) is a C12 alkyl functional silane coupling agent designed to provide effective hydrophobicity, moisture resistance, and surface modification for a wide range of inorganic materials.

Its molecular structure combines a linear C12 alkyl chain with three hydrolyzable methoxy silane groups.
After hydrolysis and condensation, the silane groups chemically bond to hydroxyl-containing inorganic substrates, while the alkyl chain forms a low-surface-energy hydrophobic layer, significantly reducing water absorption and improving material durability.

Compared with longer-chain alkyl silanes (C16–C18), N-Dodecyltrimethoxysilane offers better penetration into porous substrates and improved cost efficiency, making it especially suitable for large-scale industrial and construction applications.

This product is manufactured by Zibo Chiye Chemical Technology Co., Ltd. and supplied with stable quality and consistent batch performance for global markets.

Reaction Mechanism & Functional Logic

• Methoxy silane groups hydrolyze to silanol groups, which chemically bond with hydroxyl groups on silica, glass, stone, concrete, ceramics, and metal oxides.
• The C12 alkyl chain orients outward from the surface, forming a continuous hydrophobic barrier.

This molecular arrangement results in:

• Effective water repellency and moisture resistance
• Reduced capillary water uptake
• Improved weather resistance and durability
• Maintained vapor permeability of treated materials

Synonyms & International Reference Grades

• N-Dodecyltrimethoxysilane
• Dodecyltrimethoxysilane

International reference grades (for technical comparison):

• Silquest® A-135
• Dynasylan® DTMO

(Referenced for application equivalence in overseas markets)

Typical Technical Specifications

Typical values are for reference only and not intended as specification limits.

Key Features & Advantages

Balanced C12 Hydrophobic Structure

Provides strong water repellency while maintaining excellent penetration into porous substrates.

Strong Inorganic Surface Bonding

Trimethoxy silane groups ensure durable covalent bonding to mineral and oxide surfaces.

Improved Processing & Cost Efficiency

Lower viscosity and better dispersion compared with longer-chain alkyl silanes.

Long-Term Surface Protection

Hydrophobic layer remains effective under outdoor exposure and humidity cycling.

Application Logic & Industrial Uses

Building Materials & Construction

Used for concrete, stone, brick, mortar, and masonry to reduce water absorption and extend service life.

Surface Treatment of Mineral Fillers

Improves hydrophobicity and compatibility of silica, calcium carbonate, and mineral powders.

Glass & Ceramic Treatment

Enhances water repellency without affecting transparency or appearance.

Coatings & Sealers

Improves moisture resistance and durability of protective and water-repellent coatings.

Water-Repellent Systems

Applied in masonry protection and exterior surface treatment formulations.

Why Choose N-Dodecyltrimethoxysilane from CHIYE

• Direct Manufacturer Supply
  Stable production capacity with consistent quality control.
• Industry-Proven Alkyl Silane Grade
  Widely used in construction and surface-treatment industries.
• Export-Oriented Quality
  Supplied to international markets with specifications aligned to global standards.
• Technical Support Available
  Assistance provided for formulation design, dilution ratios, and application guidance.

Packaging & Storage

• Standard Packaging: 25 kg drum / 200 kg steel drum
• Storage Conditions: Store in sealed containers in a cool, dry, and well-ventilated area. Protect from moisture.
• Shelf Life: 12 months under recommended storage conditions

Manufacturer Information

Zibo Chiye Chemical Technology Co., Ltd.
A professional manufacturer of silane coupling agents and functional organosilicon products, supplying global construction, coating, and surface-treatment markets with stable quality and application-focused solutions.

TDS, SDS, and samples are available upon request.