Heptamethyltrisiloxane
Heptamethyltrisiloxane

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What is Heptamethyltrisiloxane?

Heptamethyltrisiloxane (abbreviated as MDM) is a low-molecular-weight, highly volatile linear siloxane compound with the chemical formula \(\ce{C7H24O2Si3}\). It is a colorless and transparent liquid at ambient temperature, featuring excellent spreading, penetrating and fast-evaporating properties. Its molecular structure contains three silicon atoms and seven methyl groups. Its evaporation rate falls between that of hexamethyldisiloxane (MM) and octamethylcyclotetrasiloxane (D4). It combines low surface tension and good compatibility. Free of chlorine, sulfur and heavy metals, this substance meets increasingly stringent requirements for VOC control and environmental compliance in personal care, electronics, coatings and other industries.

Main Application Areas

Heptamethyltrisiloxane is widely used in three major sectors. First, personal care: it serves as an aerosol propellant, fragrance fixative carrier, and instant dry-feel additive in hair conditioners and body lotions. Second, industrial additives: it is used in precision cleaners, release agents, and formulated defoamers to improve system fluidity and interfacial spreading performance. Third, organosilicon monomer intermediate: it participates in hydrosilylation reactions to produce vinyl-modified silicone oil or acts as an end-capping agent to regulate polymer molecular weight. In recent years, small-batch validation trials have also been carried out in emerging applications such as electrolyte additives for new energy batteries and diluents for flexible electronic coatings.

Selection Criteria for Heptamethyltrisiloxane: Key Indicators

  1. Purity (≥99.0%) and cyclic impurities (e.g., D4, D5): Directly affect downstream product stability and residual odor. Premium grades feature total cyclic impurities controlled below 0.3%.
  2. Evaporation rate (T90 ≤120 s at 25 °C): Must match production line drying cycles. Too fast evaporation causes uneven film formation; too slow evaporation reduces production efficiency.
  3. Water content (≤50 ppm): Excess water triggers side reactions in hydrosilylation or catalytic hydrolysis, which is especially detrimental to hydrogen-containing silicone oil systems.
  4. Acid value (≤0.05 mg KOH/g) and color (APHA ≤10): Determine long-term storage stability and the appearance of end products.
  5. Batch consistency: The fluctuation range of refractive index(nD201.382–1.385) and density (0.932–0.936 g/cm³) across five consecutive batches shall be less than ±0.001.

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Heptamethyltrisiloxane FOR MEDICINE

Heptamethyltrisiloxane FOR MEDICINE

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 FOR DAILY CHEMICALS

Heptamethyltrisiloxane FOR DAILY CHEMICALS

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 FOR PESTICIDES

Heptamethyltrisiloxane FOR PESTICIDES

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 FOR INDUSTRY

Heptamethyltrisiloxane FOR INDUSTRY

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.

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