Description

1,1,1,3,3,5,5-Heptamethyltrisiloxane is a linear, low molecular weight organosilicon compound, specifically a methyl-terminated trisiloxane. This chemical serves as a versatile intermediate and functional fluid, prized for its excellent spreading and wetting properties due to its unique surface activity. It is a critical raw material for manufacturers in the silicone industry, particularly for the synthesis of more complex siloxane polymers, silicone surfactants, and specialty lubricants.

Application

• Silicone Intermediate: A key building block for the synthesis of higher molecular weight silicone oils, resins, and elastomers.
• Surfactant & Spreader: Used in agricultural adjuvants and industrial coatings to enhance the wetting, spreading, and penetration of formulations.
• Lubricant & Release Agent: Functions as a base fluid or additive in specialty lubricants, mold release agents, and anti-foaming formulations.
• Personal Care & Cosmetics: Employed as a volatile carrier or emollient in antiperspirants, deodorants, and skin care products for a dry, non-greasy feel.
• Electronics & Electrical: Used in heat transfer fluids and as a component in dielectric coolants or insulating materials.
• Chemical Synthesis: Acts as a starting material or protecting agent in organometallic chemistry and pharmaceutical synthesis.

Basic Information

Product Name	1,1,1,3,3,5,5-Heptamethyltrisiloxane
CAS No.	2895-07-0
Molecular Formula	C7H24O2Si3
Molecular Weight	236.53 g/mol
Synonyms	Heptamethyltrisiloxane; MD2M; 1,1,1,3,3,5,5-Heptamethyltrisiloxane; Trisiloxane, 1,1,1,3,3,5,5-heptamethyl-; M2 Siloxane; HMTS; Methyl-terminated trisiloxane; Dow Corning® 200 Fluid 0.65 cSt (related product)
EINECS	220-780-6

Quality Control

Our 1,1,1,3,3,5,5-Heptamethyltrisiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC) for purity and identity confirmation, to ensure it meets precise specifications for industrial and specialty applications. Certificates of Analysis (COA) documenting key parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent contact with atmospheric moisture, which can affect product quality.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Refractive Index (n20D)	1.3880 - 1.3920
Density (20°C)	0.820 - 0.830 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.