Description

Dimethylsiloxane, Methyl Octyl is a specialized organosilicon compound, a methyl octyl substituted linear siloxane polymer. This chemical is valued for its unique combination of silicone-based properties and the influence of the longer octyl chain, offering specific performance characteristics not found in standard polydimethylsiloxanes. It serves as a critical functional fluid and additive in advanced manufacturing sectors where tailored surface activity, lubrication, and compatibility are required. Key industrial users include formulators of specialty lubricants, release agents, and high-performance personal care products.

Application

• Functional fluid and base oil in high-performance synthetic lubricants and greases.
• Key ingredient in mold release agents for plastics, rubber, and composite materials.
• Emollient and conditioning agent in premium cosmetic and personal care formulations.
• Additive for improving surface slip, gloss, and texture in coatings and polishes.
• Intermediate for the synthesis of more complex silicone copolymers and surfactants.
• Processing aid and internal lubricant in plastic and polymer manufacturing.
• Component in dielectric and heat transfer fluids for specialized electrical applications.
• Water repellent and protective agent for textiles and leather.

Basic Information

Item	Detail
Product Name	Dimethylsiloxane, Methyl Octyl
CAS No.	70900-22-0
Molecular Formula	Typically CnH2n+2O(n-1)/2Si(n+1)/2 (Polymeric mixture)
Molecular Weight	Varies by chain length (n). Contact for details on specific grade.
Synonyms	Methyloctylsiloxane; Poly(dimethylsiloxane-co-methyloctylsiloxane); Methyl Octyl Silicone Fluid; Octyl Methyl Siloxane Copolymer; Dimethyl Methyloctyl Siloxane; Siloxanes and Silicones, C8-alkyl Me; Dow Corning® 2503 Fluid (example trade name); ABIL®-Wax 9801 (example trade name)
EINECS	Contact for details

Quality Control

Our Dimethylsiloxane, Methyl Octyl is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency in viscosity, refractive index, specific gravity, and compositional purity. Certificates of Analysis (COA) documenting these parameters are provided to guarantee the product meets your technical requirements and supports your own 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). Keep away from strong oxidizing agents. For long-term storage, consider under an inert atmosphere such as nitrogen to maintain optimal quality.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Viscosity @ 25°C	Specified grade (cSt)
Specific Gravity @ 25°C	0.85 - 0.95
Refractive Index @ 25°C	1.40 - 1.43
Water Content (KF)	< 0.1%
Acidity/Alkalinity	Neutral

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