Octadecylmethyldimethoxysilane Bulk Price Specs & Data
Octadecylmethyldimethoxysilane CAS Number and Critical Technical Specifications
Octadecylmethyldimethoxysilane, identified by CAS Number 70851-50-2, is a long-chain alkyl silane utilized primarily for surface modification and hydrophobicity enhancement. The molecule features an eighteen-carbon chain (C18) attached to a silicon center bonded with one methyl group and two methoxy groups. This specific configuration classifies it as a C18 Silane and a critical Silane Coupling Agent in industrial formulations. The dimethoxy functionality dictates the hydrolysis kinetics, offering a balance between reactivity and storage stability compared to trialkoxy variants.
Physical specifications for industrial grade material typically indicate a colorless to slightly yellow liquid form. The density generally ranges around 0.88 g/mL at 25 °C, with a boiling point exceeding 170 °C under vacuum conditions (0.1 mmHg). Refractive index values are commonly observed near n20/D 1.439. These physical constants are essential for quality control during incoming inspection at manufacturing facilities. The molecular weight is approximately 330.6 g/mol, distinguishing it from heavier trimethoxy analogues. For detailed product specifications and availability, buyers often reference the Octadecylmethyldimethoxysilane waterproofing agent industrial portfolio to ensure alignment with formulation requirements.
Octadecylmethyldimethoxysilane Bulk Price Drivers Versus Laboratory Package Costs
Pricing structures for silane coupling agents vary significantly between laboratory-scale reagents and bulk industrial procurement. Market data for analogous silanes indicates that laboratory packages (25g to 100g) often carry unit prices ranging from $28 to over $100 per small container. Some specialized listings show costs exceeding $1,000 for limited volume packs due to packaging, handling, and regulatory overhead associated with small hazardous material shipments. These prices do not reflect the economics of bulk synthesis or tonnage purchasing.
Bulk price drivers for Octadecylmethyldimethoxysilane are influenced by raw material costs for chlorosilanes and long-chain alcohols, energy consumption during distillation, and logistics. Industrial buyers prioritize cost-per-kilogram over unit price. Volume commitments typically unlock significant discounts compared to catalog pricing. Supply chain volatility and freight rates also impact landed costs. NINGBO INNO PHARMCHEM CO.,LTD. structures pricing based on volume tiers, ensuring that large-scale manufacturers receive competitive rates aligned with production budgets rather than research grant limitations. Procurement managers should request tiered quotes based on annual consumption to optimize expenditure.
Differentiating Octadecylmethyldimethoxysilane From Octadecyltrimethoxysilane in Sourcing
Sourcing errors often occur when procurement teams confuse Octadecylmethyldimethoxysilane (CAS 70851-50-2) with Octadecyltrimethoxysilane (CAS 3069-42-9). While both are C18 functional silanes used for hydrophobization, the alkoxy group count alters performance. The trimethoxy variant possesses three hydrolyzable groups, leading to faster cross-linking and potentially higher surface coverage density but reduced stability in moist environments prior to use. The dimethoxy variant, containing only two hydrolyzable methoxy groups and one non-hydrolyzable methyl group, offers modified reactivity profiles suitable for specific coating architectures.
Technical differentiation is critical for formulation integrity. The trimethoxy analogue typically exhibits a molecular weight of 374.67 g/mol, whereas the dimethoxy target is lighter. Hydrolytic sensitivity differs; trimethoxy silanes react more aggressively with ambient moisture, requiring stricter storage controls. The table below outlines key parameter distinctions based on available chemical data to assist in technical verification during supplier qualification.
| Parameter | Octadecylmethyldimethoxysilane (Target) | Octadecyltrimethoxysilane (Reference) |
|---|---|---|
| CAS Number | 70851-50-2 | 3069-42-9 |
| Molecular Formula | C20H44O2Si | C21H46O3Si |
| Molecular Weight | ~330.6 g/mol | 374.67 g/mol |
| Alkoxy Groups | 2 (Dimethoxy) | 3 (Trimethoxy) |
| Density (25 °C) | ~0.88 g/mL | 0.883 g/mL |
| Hydrolytic Sensitivity | Moderate | High |
| Primary Application | Waterproofing, Surface Modification | SAMs, Dielectric Modification |
For facilities previously utilizing imported brands, verifying the Octadecylmethyldimethoxysilane drop-in replacement for Wacker Odm-Dimethoxy specifications ensures compatibility without reformulation. This distinction prevents performance deviations in final products such as textiles, construction chemicals, or electronics.
Industrial Grade Purity Standards and Quality Documentation for Silane Procurement
Industrial grade purity standards for silane coupling agents typically require a minimum assay of 95% to 98% as determined by Gas Chromatography (GC). Impurities often include residual alcohols from synthesis, hydrolysis products (siloxanes), or unreacted chlorosilanes. A Certificate of Analysis (COA) is the primary document for verification. Procurement protocols should mandate that every batch shipment includes a COA detailing GC area percentages, density, refractive index, and color (APHA or Pt-Co).
Quality documentation must also include Safety Data Sheets (SDS) compliant with global transport regulations. Unlike regulatory registrations which vary by region, physical quality specs are universal. Buyers should verify GC-MS data to confirm the absence of short-chain contaminants that could affect volatility or odor profiles. Stability data indicating shelf life under inert atmosphere storage is also critical. NINGBO INNO PHARMCHEM CO.,LTD. provides batch-specific documentation to ensure traceability from synthesis to delivery. Focus on the chemical data within the COA, such as purity limits and moisture content, rather than administrative processing times.
Supply Chain Logistics and Minimum Order Quantities for Bulk Silane Purchasing
Logistics for bulk silane purchasing involve careful consideration of hazardous material classifications. Octadecylmethyldimethoxysilane is moisture-sensitive and may be classified as a flammable liquid depending on flash point data (typically around 139 °C to 140 °C). Packaging usually consists of 200kg steel drums or Intermediate Bulk Containers (IBCs) lined to prevent moisture ingress. Minimum Order Quantities (MOQ) for industrial direct manufacturing typically start at one drum (200kg), though trial orders may be negotiated for qualification purposes.
Lead times depend on production scheduling and inventory levels. Bulk shipments require advance booking for freight, especially for international export where customs documentation must align precisely with the SDS and commercial invoice. Storage at the destination facility should maintain an inert atmosphere, such as nitrogen padding, to prevent premature hydrolysis during warehousing. Procurement managers should coordinate with logistics providers experienced in chemical handling to ensure containers remain sealed until point of use. Efficient supply chain management reduces waste from degraded material and ensures continuous production lines.
Understanding the technical and logistical parameters of Octadecylmethyldimethoxysilane ensures successful integration into industrial processes. Accurate specification matching and reliable documentation form the basis of a stable supply chain.
To request a batch-specific COA, SDS, or secure a bulk pricing quote, please contact our technical sales team.