Description

3-Octylheptamethyltrisiloxane is a branched, low molecular weight organosilicon compound belonging to the class of trisiloxanes. This specialty silicone fluid is valued for its unique combination of low surface tension, high spreading ability, and excellent compatibility with organic materials. It serves as a critical performance additive and intermediate in the formulation of advanced industrial products. Key industries that utilize this chemical include personal care, coatings, and specialty lubricants.

Application

• Personal Care & Cosmetics: Acts as a volatile carrier and emollient in antiperspirants, deodorants, and skin care formulations, providing a dry, non-greasy feel.
• Release Agents & Mold Lubricants: Used in plastic, rubber, and composite manufacturing to facilitate easy release from molds due to its low surface energy.
• Surface Treatments & Coatings: Functions as a leveling and wetting agent to improve the spread and uniformity of paints, inks, and protective coatings.
• Specialty Lubricants: Employed as a base fluid or additive in high-performance lubricants for precision instruments and mechanisms requiring thermal stability.
• Chemical Intermediate: Serves as a key building block (hydrosilylation feedstock) for synthesizing more complex silicone polymers and functional fluids.
• Water Repellents: Imparts hydrophobic properties to textiles, paper, and construction materials when used in treatment formulations.

Basic Information

Product Name	3-Octylheptamethyltrisiloxane
CAS No.	17955-88-3
Molecular Formula	C15H38O2Si3
Molecular Weight	334.71 g/mol
Synonyms	Octylheptamethyltrisiloxane; Heptamethyl-3-octyltrisiloxane; Trisiloxane, 3-octylheptamethyl-; 1,1,1,3,5,5,5-Heptamethyl-3-octyltrisiloxane; Silicone Fluid AK 3-Octyl; Dow Corning® 5790 Fluid (example trade name); Linear Methyloctyl Trisiloxane; Organomodified Trisiloxane
EINECS	Contact for details

Quality Control

Our 3-Octylheptamethyltrisiloxane 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 and consistent performance. Certificates of Analysis (COA) documenting purity, physical properties, and other critical parameters 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). Keep away from strong oxidizing agents, strong acids, and strong bases. Under recommended storage conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Clear, colorless liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Refractive Index (20°C)	1.410 - 1.420
Density (25°C)	0.86 - 0.89 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.