HTDMS Bulk Procurement Specs 97%: Technical Data & Sourcing
Defining HTDMS Bulk Procurement Specs: 97% Purity and Technical Data
Procurement of 1,3-Bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane (CAS: 5931-17-9) requires strict adherence to purity profiles suitable for polymer synthesis and surface modification. Industrial grade HTDMS is typically specified at a minimum assay of 97% by gas chromatography (GC). This hydroxy-functional siloxane serves as a critical silicone intermediate for producing specialized elastomers and coatings. When evaluating bulk supply, the technical data sheet must confirm the hydroxyl value, typically ranging between 5.5% to 6.5% OH, ensuring consistent reactivity during chain extension or crosslinking processes.
Physical specifications for the siloxane diol include a clear, colorless liquid appearance with a density approximating 0.98 g/cm³ at 25°C. Viscosity parameters generally fall within 40-60 cSt, though this varies based on specific batch polymerization degrees. Procurement managers must verify that the water content remains below 0.1% to prevent premature condensation during storage. At NINGBO INNO PHARMCHEM CO.,LTD., batch consistency is maintained through rigorous distillation and filtration protocols prior to packaging. The material is classified as an organosilicon compound requiring standard chemical handling procedures, distinct from volatile silazanes.
For detailed technical parameters regarding the 1,3-Bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane silicone intermediate, buyers should reference the specific certificate of analysis provided with each drum or IBC shipment. The manufacturing process involves controlled hydrosilylation followed by hydrolysis, necessitating tight control over residual catalysts such as platinum or acids. Specifications should explicitly list limits for heavy metals and residual solvents to meet downstream pharmaceutical or electronic grade requirements.
HTDMS vs HMDS: Critical Chemical Distinctions for Accurate Sourcing
A common sourcing error involves conflating HTDMS with Hexamethyldisilazane (HMDS, CAS: 999-97-3). While both are organosilicon compounds used in surface modification and synthesis, their chemical structures and reactivity profiles differ fundamentally. HMDS is a silazane used primarily as a silylating agent or adhesion promoter, whereas HTDMS is a disiloxane diol used as a polymer building block. Confusing these materials can lead to catastrophic formulation failures, particularly in moisture-sensitive applications.
HMDS functions by releasing ammonia during silylation reactions and is highly moisture-sensitive, hydrolyzing rapidly to form hexamethyldisilyl ether. In contrast, the hydroxy-functional siloxane structure of HTDMS provides stable terminal hydroxyl groups for condensation reactions without ammonia evolution. This distinction is vital for procurement teams specifying materials for semiconductor coatings versus silicone rubber synthesis. The following table outlines the critical technical divergences between these compounds to ensure accurate ordering.
| Parameter | HTDMS (CAS 5931-17-9) | HMDS (CAS 999-97-3) |
|---|---|---|
| Chemical Class | Disiloxane Diol | Silazane |
| Functionality | Hydroxy-terminated (OH) | Amino-silyl (NH) |
| Primary Application | Silicone Polymer Intermediate | Silylating Agent / Adhesion Promoter |
| Reaction Byproduct | Water (during condensation) | Ammonia (during silylation) |
| Moisture Sensitivity | Moderate (Hygroscopic) | High (Hydrolyzes rapidly) |
| Boiling Point | >200°C (Estimated) | 125°C |
| Density (25°C) | ~0.98 g/cm³ | ~0.77 g/cm³ |
Understanding these differences prevents supply chain disruptions. For facilities requiring specific performance metrics akin to legacy suppliers, reviewing the 1,3-Bis(4-hydroxybutyl)-1,1,3,3-tetramethyldisiloxane Htdms Equivalent For Gelest Sib1130.0 documentation ensures compatibility with existing formulations. Procurement specifications must explicitly state the CAS number to avoid vendor substitution errors.
Quality Assurance Protocols and CoA Requirements for Industrial HTDMS
Industrial acceptance of Bis(hydroxybutyl)tetramethyldisiloxane relies on comprehensive Quality Assurance (QA) documentation. A valid Certificate of Analysis (CoA) must accompany every batch, detailing the results of GC-MS profiling. The primary metric is the area percentage of the main peak, which must exceed 97% to qualify as industrial grade. Impurities such as cyclic siloxanes (D4, D5, D6) or incomplete reaction products should be quantified and listed with upper limits.
Water content analysis is critical, typically performed via Karl Fischer titration. Values exceeding 0.1% can compromise the stoichiometry of subsequent polymerization reactions. Additionally, the CoA should report the hydroxyl value (mg KOH/g) to confirm functional group density. Acid value and viscosity measurements provide secondary verification of batch consistency. NINGBO INNO PHARMCHEM CO.,LTD. maintains archival samples for every production lot to facilitate traceability in the event of downstream quality disputes.
Packaging integrity is part of the QA protocol. HTDMS should be shipped in lined steel drums or ISO tanks under nitrogen padding to minimize oxidative degradation and moisture uptake. Upon receipt, procurement teams should verify the seal integrity and check the headspace gas composition if possible. Any deviation from the specified refractive index (n20/D ~1.41) should trigger an immediate quarantine and request for re-testing. These protocols ensure that the synthesis route downstream remains unaffected by raw material variability.
Volume Pricing Structures and MOQ Guidelines for 97% Purity HTDMS
Pricing for 97% purity HTDMS is tiered based on volume commitments and packaging configurations. Standard Minimum Order Quantities (MOQ) typically start at 200kg (one drum) for sample validation, scaling up to metric tonnage for contract manufacturing. Bulk procurement agreements often secure lower unit costs by locking in quarterly volumes. Spot pricing fluctuates based on raw material costs for dimethylsiloxane precursors and energy inputs required for distillation.
Contract structures usually offer three tiers: drum (200kg), IBC (1000kg), and bulk tanker. IBC shipments reduce packaging waste and handling costs for high-volume consumers. Payment terms for established accounts may include net-30 or net-60 options, contingent on credit verification. It is advisable to negotiate price stability clauses for contracts exceeding six months to mitigate market volatility. Long-term agreements also prioritize allocation during periods of high global demand.
Custom synthesis options are available for specifications exceeding standard 97% purity, such as electronic grade requiring 99%+ assay. These specialized batches incur higher manufacturing costs due to additional fractional distillation steps. Buyers should communicate their target price points early in the negotiation process to align production scheduling with budget constraints. Volume rebates may apply for annual commitments exceeding 10 metric tons.
Global Supply Chain Logistics and Lead Times for HTDMS Bulk Orders
Lead times for HTDMS bulk orders depend on inventory status and destination port. Standard ex-stock delivery for drum quantities typically ranges from 7 to 14 days. Custom production batches require 4 to 6 weeks for synthesis, purification, and QA testing. International shipping involves classification under appropriate hazardous material codes, though HTDMS is generally less restrictive than volatile silazanes. Documentation must include Safety Data Sheets (SDS) compliant with the destination country's regulations.
Storage during transit requires protection from extreme temperatures and direct sunlight. While not classified as highly dangerous goods, proper labeling ensures smooth customs clearance. Port congestion and freight availability can impact final delivery dates, so procurement planners should buffer schedules accordingly. For just-in-time manufacturing, maintaining a safety stock of two months' consumption is recommended to absorb supply chain shocks.
Logistics partners must be vetted for experience with liquid chemical handling. Bulk liquid shipments via ISO tanks offer the most cost-effective solution for intercontinental transport. Tracking systems should be implemented to monitor shipment location and estimated time of arrival. Efficient coordination between the supplier's logistics team and the buyer's receiving warehouse minimizes demurrage charges and ensures immediate quality inspection upon arrival.
Strategic sourcing of 3-bis(4-hydroxybutyl)tetramethyldisiloxane ensures uninterrupted production schedules for silicone-based products. By adhering to strict technical specifications and leveraging robust supply chain partnerships, manufacturers can maintain high quality standards while optimizing costs.
Ready to optimize your supply chain? Reach out to our logistics team today for comprehensive specifications and tonnage availability.