3-Mercaptopropylmethyldimethoxysilane 98% Purity Specs & Sourcing
Global Market Sourcing: 3-Mercaptopropylmethyldimethoxysilane 98% Purity Specs
Procurement of 3-Mercaptopropylmethyldimethoxysilane (CAS 31001-77-1) requires strict verification of chemical identity and purity levels to ensure consistent performance in silane coupling applications. This bifunctional organosilane, often referred to as MPMDMS or a Thiol silane, serves as a critical interface between organic polymers and inorganic substrates. When sourcing this material, the primary differentiator lies in the assay purity, specifically the 98% threshold, which directly impacts the density of thiol groups available for bonding during compounding.
Global supply chains for this Mercapto silane vary significantly in terms of quality control protocols. Lower purity grades often contain residual methanol or unreacted silanes that can interfere with cure kinetics in polysulfide and polyurethane sealants. Procurement managers must prioritize suppliers who provide comprehensive Certificates of Analysis (COA) detailing GC-MS chromatograms rather than relying solely on generic specification sheets. At NINGBO INNO PHARMCHEM CO.,LTD., we emphasize batch-specific data to validate the integrity of the mercapto functionality.
The molecular formula C6H16O2SSi and molecular weight of 180.34 g/mol are constant, but the physical presentation can vary based on distillation efficiency. High-grade material should present as a clear, colorless to light yellow liquid. Deviations in color often indicate oxidation of the thiol group, which reduces coupling efficiency. For detailed technical data on our available grades, review our 3-Mercaptopropylmethyldimethoxysilane MPMDMS silane coupling agent product specifications. Ensuring the supply chain maintains nitrogen blanketing during transport is also essential, as the material is moisture-sensitive and hydrolytically unstable upon prolonged exposure to ambient humidity.
Industrial Specifications and QA/QC for 3-Mercaptopropylmethyldimethoxysilane
Quality assurance for 3-Mercaptopropylmethyldimethoxysilane hinges on precise physical and chemical parameters. The material is classified under HS Code 29319090 and must meet specific boiling point and density ranges to be considered suitable for high-performance elastomer manufacturing. The following table outlines the critical specification limits expected for industrial-grade procurement versus standard laboratory reagents.
| Parameter | Industrial Specification (Bulk) | Laboratory Grade | Test Method |
|---|---|---|---|
| CAS Number | 31001-77-1 | 31001-77-1 | Verification |
| Purity (GC) | ≥ 98.0% | ≥ 95.0% | Gas Chromatography |
| Boiling Point | 96 °C / 30 mmHg | 200 °C (atm) | Distillation |
| Density | 1.00 ± 0.05 g/mL (25 °C) | 1.04 g/mL | ASTM D4052 |
| Refractive Index | 1.450 ± 0.005 (n20/D) | 1.450 | ASTM D1218 |
| Flash Point | 199 °F (93 °C) | 93 °C | Pensky-Martens |
| Water Solubility | Insoluble | Insoluble | Observation |
| Storage Stability | 12 Months (N2 Blanket) | 6 Months | Accelerated Aging |
The hydrolytic sensitivity of this Silane coupling agent requires strict adherence to storage protocols. With a hydrolytic sensitivity rating of 7, it reacts slowly with moisture, necessitating storage under nitrogen at room temperature to prevent premature polymerization or gelation. QA/QC processes must include verification of the thiol (-SH) group concentration, as oxidation to disulfides renders the material ineffective for sulfur-cured elastomers. Spectroscopic analysis should confirm the absence of significant impurities that could act as retarders in tire tread compounds or adhesive formulations.
For formulators seeking to match existing supply chains, it is critical to validate performance benchmarks against legacy materials. We recommend reviewing our 3-Mercaptopropylmethyldimethoxysilane Drop-In Replacement For Dynasylan 3403 technical documentation to ensure formulation compatibility. The refractive index and specific gravity are key indicators of batch consistency; deviations here often signal contamination with higher boiling silanes or residual solvents. NINGBO INNO PHARMCHEM CO.,LTD. maintains rigorous internal standards that exceed typical industry minimums to guarantee reproducible adhesion properties in mineral-filled systems.
Factory-Direct Bulk Pricing Considerations
Pricing structures for 3-Mercaptopropylmethyldimethoxysilane are heavily dependent on order volume, packaging configuration, and purity guarantees. Market analysis indicates significant price disparities between laboratory-scale packaging (e.g., 25mL to 250ml bottles) and industrial bulk quantities (drums or IBCs). Laboratory reagents often command premiums exceeding $100 per liter due to packaging overhead and lower turnover rates, whereas bulk synthesis contracts optimize cost-per-kilogram through direct manufacturing channels.
When evaluating factory-direct pricing, procurement teams must account for the total cost of ownership, which includes stability testing and waste management. Material priced significantly below market averages may indicate reduced purity levels (e.g., 95% vs 98%) or inadequate stabilization against oxidation. The cost implication of using lower-grade silane includes potential batch failures in downstream production, particularly in aerospace adhesives or automotive sealants where tensile and tear strength are critical. Bulk contracts should specify Incoterms clearly, as the material is classified as a Combustible Liquid (Hazard Class 3) with a UN number of UN2924, impacting freight costs.
Packaging options typically range from 25kg drums to larger isotanks for continuous processing lines. It is vital to confirm that the supplier utilizes lined containers or passivated steel to prevent catalytic decomposition of the thiol group. Lead times for custom synthesis or large-volume orders should be negotiated based on production cycles, as the synthesis of organosilanes involves specific reaction windows and distillation phases. Transparency in pricing models allows for accurate budgeting without hidden fees for COA verification or stability data. By securing direct manufacturing agreements, buyers eliminate intermediary markups and gain direct access to process engineering support for troubleshooting formulation issues.
Strategic sourcing involves balancing immediate inventory needs with long-term supply security. Establishing a partnership with a manufacturer capable of consistent batch-to-batch reproducibility reduces the need for incoming quality inspection overhead. For high-volume applications in tire manufacturing or mineral treatment, locking in pricing based on raw material indices (such as silicon metal or methanol) can provide cost stability over multi-year contracts. Always request sample batches for pilot testing before committing to full-scale procurement to validate rheological performance and cure characteristics in your specific polymer matrix.
For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.