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Heptamethyltrisiloxane
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The compliance status of heptamethyltrisiloxane with REACH regulations requires careful examination of specific chemical structures and their regulatory status. Recent updates to the REACH Candidate List of Substances of Very High Concern (SVHC) have important implications for manufacturers and users of certain siloxane compounds.
It’s crucial to differentiate between various forms of heptamethyltrisiloxane. The base compound 1,1,1,3,5,5,5-heptamethyltrisiloxane (CAS 1873-88-7) currently maintains a different regulatory status compared to its modified versions. According to ECHA’s registration dossier, this particular substance shows “no hazard identified” for aquatic environments and is not classified for acute or chronic toxicity under the CLP Regulation .
However, the regulatory landscape became more complex when ECHA added three new substances to the SVHC Candidate List on June 25, 2025, including 1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane (CAS 17928-28-8) due to its very persistent and very bioaccumulative (vPvB) properties . This distinction highlights the importance of precise chemical identification when assessing REACH compliance.
Heptamethyltrisiloxane serves multiple industries with distinct compliance needs. In the pharmaceutical sector, it functions as a transformative functional material characterized by low viscosity and high permeability, making it valuable for advanced drug delivery systems. When sourced from reputable suppliers like Biyuan, pharmaceutical-grade heptamethyltrisiloxane comes with USP Class VI certification and ISO 10993-5 compliance, ensuring it meets stringent safety standards for medical applications .
The personal care industry utilizes heptamethyltrisiloxane for its unique volatile characteristics and exceptional spreading properties. This lightweight silicone fluid enhances product performance across various categories while meeting rigorous safety standards. For agricultural applications, it acts as a powerful adjuvant that improves pesticide efficacy through superior surface coverage and penetration capabilities .
Companies working with siloxane compounds face increasing due diligence requirements. Under REACH regulations, suppliers must provide information on safe use if articles contain SVHCs above 0.1% concentration. Importers and producers have six months from the inclusion date (June 25, 2025) to notify ECHA about articles containing newly listed SVHCs . This creates significant compliance challenges for supply chain management.
Biyuan has established itself as a reliable manufacturer of heptamethyltrisiloxane by implementing rigorous quality control measures throughout production. Their ISO 9001/14001-certified facility employs 3-stage distillation processes to achieve 99.5% purity levels, with each batch accompanied by a Certificate of Analysis (COA) to verify compliance . This commitment to quality ensures that Biyuan’s heptamethyltrisiloxane meets the specific regulatory requirements of various industries, from FDA standards for cosmetic and pharmaceutical applications to RoHS compliance for electronics manufacturing.
Rather than offering generic solutions, Biyuan develops tailored heptamethyltrisiloxane formulations for specific application scenarios. For agricultural clients, they provide variants with anti-settling properties optimized for pesticide formulations. The cosmetics sector benefits from low-sensitization grades suitable for serums and personal care products, while electronics manufacturers receive ultra-low impurity versions (<0.1%) for specialized applications . This targeted approach ensures that clients receive products optimized for their specific compliance and performance requirements.
The environmental profile of heptamethyltrisiloxane is a critical factor in regulatory assessments. The compound demonstrates a hydrolysis half-life of 2.2 days at pH 7 and 25°C, with low water solubility (0.02 mg/l) and a high log Kow (6.2) . These properties influence its environmental behavior and regulatory status. REACH guidance indicates that for substances with hydrolytic DT50 less than 12 hours, environmental effects are primarily attributed to hydrolysis products rather than the parent compound. With its moderate degradation rate, environmental hazard assessments for heptamethyltrisiloxane consider both the parent substance and its transformation products .
Comprehensive ecotoxicological data provides the scientific basis for regulatory decisions. Short-term E(L)C50 values for heptamethyltrisiloxane exceed 0.108 mg/l in fish, 0.030 mg/l in invertebrates, and 0.019 mg/l in algae. Long-term data from structural analogues indicate NOEC values ≥0.027 mg/l in fish and ≥0.015 mg/l in invertebrates . These values indicate low aquatic toxicity concerns at environmental relevant concentrations.
Companies using heptamethyltrisiloxane must implement robust communication protocols to meet REACH obligations. Article 33 requires suppliers to inform customers about SVHC presence in articles exceeding 0.1% concentration. Safety Data Sheets must be updated to reflect new classifications, and articles containing SVHCs must be declared in ECHA’s SCIP database . These requirements make supply chain transparency essential for compliance.
Leading manufacturers like Biyuan help clients navigate these complexities through technical support and documentation. Their dedicated team of chemical engineers provides formulation optimization assistance and technical documentation, helping clients maintain compliance while leveraging the performance benefits of heptamethyltrisiloxane . This proactive approach minimizes regulatory risks for businesses operating in regulated markets.
The inclusion of certain siloxane compounds on the SVHC Candidate List signals increasing regulatory scrutiny of persistent, bioaccumulative substances. Companies relying on heptamethyltrisiloxane should monitor regulatory developments and consider alternative solutions where appropriate. Working with technically advanced manufacturers like Biyuan provides access to the latest compliance information and potential alternative formulations as regulatory requirements evolve.
The dynamic nature of chemical regulations underscores the importance of partnering with suppliers who prioritize compliance and technical innovation. Businesses that implement robust chemical management systems and maintain flexible supply chains will be best positioned to adapt to changing regulatory requirements while continuing to benefit from the unique properties of heptamethyltrisiloxane in their applications.
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Heptamethyltrisiloxane is emerging as a transformative functional material in the pharmaceutical industry. This volatile silicone derivative combines low viscosity with high permeability, offering unique solutions for advanced drug delivery systems and medical device technologies. Certified USP Class VI and compliant with ISO 10993-5 standards, heptamet.
Heptamethyltrisiloxane is transforming the personal care industry through its unique volatile characteristics and exceptional spreading properties. This lightweight silicone fluid delivers instant sensory enhancement while providing functional benefits across various product categories. Heptamethyltrisiloxane meets rigorous safety standards including RE.
Heptamethyltrisiloxane is emerging as a powerful adjuvant in modern agriculture, leveraging its unique properties to enhance crop protection product performance. This organosilicone compound acts as a super-spreader, dramatically improving the efficacy of pesticides, herbicides, and fungicides through superior surface coverage and penetration. The mater.
Heptamethyltrisiloxane is gaining recognition as a versatile performance additive in various industrial sectors due to its unique combination of low viscosity, high volatility, and exceptional surface activity. This organosilicone compound serves as an efficient process aid and functional modifier across multiple applications. Heptamethyltrisiloxane off.
