Description

1,1,1,3,5,5,5-Heptamethyltrisiloxane is a highly versatile, low molecular weight organosilicon compound, also known as MD'M, valued for its excellent volatility and compatibility with organic systems. Its primary commercial value lies in its role as a key intermediate and functional fluid in silicone chemistry, offering unique properties for surface modification and formulation. This product is essential for manufacturers in the personal care, coatings, and electronics industries seeking to enhance product performance through silicone integration.

Application

• Silicone Intermediate: A crucial building block for the synthesis of more complex silicone polymers, resins, and fluids.
• Personal Care & Cosmetics: Used as a volatile carrier and emollient in antiperspirants, deodorants, and skin care products to provide a dry, non-greasy feel.
• Release Agents & Lubricants: Functions as a component in mold release formulations and lubricants due to its low surface tension and thermal stability.
• Surface Treatment: Employed as a hydrophobizing agent for treating silica, pigments, and other fillers to improve dispersion in organic matrices.
• Electronics: Serves as a solvent or processing aid in the manufacture of electronic components and coatings.
• Pharmaceuticals: Acts as a volatile excipient or carrier in topical drug delivery systems.
• Adhesives & Sealants: Used as a plasticizer or flow control additive to modify rheology and cure profiles.

Basic Information

Product Name	1,1,1,3,5,5,5-Heptamethyltrisiloxane
CAS No.	1873-88-7
Molecular Formula	C7H22O2Si3
Molecular Weight	222.51 g/mol
Synonyms	MD'M; Heptamethyltrisiloxane; Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-; HMTS; 1,3-Bis(trimethylsilyloxy)-1,1,3,3-tetramethyldisiloxane; Dow Corning® 200 Fluid 0.65 cSt; Volatile Silicone Fluid; Linear Trimethylsiloxy Terminated Trisiloxane
EINECS	217-515-5

Quality Control

Our 1,1,1,3,5,5,5-Heptamethyltrisiloxane is produced under strict quality management systems to ensure batch-to-batch consistency and high purity. We provide comprehensive analytical testing, including GC, NMR, and Karl Fischer titration, to verify identity, assay, and critical impurity profiles. Certificates of Analysis (COA) documenting all relevant specifications are available for every shipment upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic and highly volatile nature, containers must be kept tightly sealed when not in use to prevent moisture absorption and evaporation. Keep away from strong acids and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to reference
Assay (GC)	≥ 98.0 %
Refractive Index (n20/D)	1.3890 - 1.3930
Density (20°C)	0.818 - 0.828 g/mL
Water Content (KF)	≤ 0.1 %

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