Description

Hexadecamethylheptasiloxane is a linear, fully methylated organosilicon compound belonging to the volatile methyl siloxane (VMS) family. This high-purity intermediate is valued for its excellent thermal stability, low surface tension, and high compressibility, making it a critical building block in advanced silicone manufacturing. It is primarily sought by formulators and manufacturers in the personal care, industrial lubricant, and specialty polymer sectors for creating high-performance products.

Application

• Silicone Fluid Intermediate: A key precursor in the synthesis of polydimethylsiloxane (PDMS) fluids and gums of various viscosities.
• Personal Care & Cosmetics: Used as a volatile carrier and emollient in antiperspirants, deodorants, and skin care formulations, where it provides a dry, silky feel.
• Release Agents & Lubricants: Functions as a base fluid or additive in mold release agents and high-temperature lubricants due to its thermal stability.
• Water Repellents: Serves as a hydrophobic agent in treatments for textiles, leather, and construction materials.
• Electrical & Thermal Insulation: Incorporated into potting compounds, encapsulants, and thermal interface materials for electronics.
• Plastics & Rubber Processing: Acts as an internal lubricant and processing aid to improve flow and mold release in polymer compounding.
• Pharmaceutical Aerosols: Employed as a propellant or excipient in pressurized metered-dose inhalers (pMDIs).
• Chemical Synthesis: Utilized as a reactive intermediate or protecting group in organosilicon chemistry.

Basic Information

Product Name	Hexadecamethylheptasiloxane
CAS No.	541-01-5
Molecular Formula	C16H50O6Si7
Molecular Weight	577.25 g/mol
Synonyms	MD7M; Octamethyltrisiloxane (common misnomer for linear heptamer); Heptamer of dimethylsiloxane; Linear heptasiloxane; Polydimethylsiloxane, trimethylsiloxy-terminated (n=7); SH 200 Fluid (series); VMS Fluid; Volatile Methyl Siloxane; Dimethylsiloxane heptamer; 1,1,1,3,3,5,5,7,7,9,9,11,11,13,13,15,15-Heptadecamethyloctasiloxane (IUPAC); Dow Corning 200 Fluid (0.65 cSt); Contact for additional trade names.
EINECS	208-764-9

Quality Control

Our Hexadecamethylheptasiloxane is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including gas chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications for critical applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment to guarantee traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat, sparks, and open flame. Containers should be kept tightly sealed when not in use to prevent moisture absorption and maintain product integrity.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to standard
Assay (GC)	≥ 98.0%
Refractive Index (20°C)	1.390 - 1.395
Density (25°C)	0.96 - 0.98 g/mL
Water Content (KF)	≤ 0.05%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.