Description

(50% Dimethylsilane) (50% Phenylmethylsilane) Copolymer is a specialized organosilicon polymer engineered to deliver a unique balance of properties derived from its dimethylsilane and phenylmethylsilane monomer units. This copolymer is valued for its ability to modify surface characteristics, enhance thermal stability, and impart specific release or barrier properties in advanced material formulations. It is primarily sought by manufacturers in the silicone elastomer, pressure-sensitive adhesive, release coating, and specialty resin industries seeking to fine-tune material performance.

Application

• Release Coatings: A key component in formulating silicone-based release liners for labels, tapes, and graphic films.
• Silicone Pressure-Sensitive Adhesives (PSAs): Used as a modifier to adjust tack, peel adhesion, and cohesion properties.
• Silicone Elastomers & Rubbers: Acts as a processing aid and property modifier, influencing flexibility, thermal resistance, and surface energy.
• Water Repellents & Surface Treatments: Imparts hydrophobic characteristics to textiles, paper, and construction materials.
• Mold Release Agents: Formulated into non-stick coatings for industrial molding processes, including plastics and composites.
• Specialty Resins & Polymers: Serves as an additive or co-reactant to enhance compatibility, reduce friction, or modify the dielectric properties of engineering plastics.
• Cosmetic & Personal Care Ingredients: Used in formulations for hair conditioners and skin care products to provide smooth feel and film-forming properties.

Basic Information

Product Name	(50% Dimethylsilane) (50% Phenylmethylsilane) Copolymer
CAS No.	143499-71-2
Molecular Formula	(C2H6Si)0.5•(C7H8Si)0.5x
Molecular Weight	Varies (Polymer)
Synonyms	Dimethylsilane-Phenylmethylsilane Copolymer; Poly(dimethylsilane-co-phenylmethylsilane); Methylphenylsiloxane-dimethylsiloxane Copolymer; Phenylmethylsiloxane-dimethylsiloxane Copolymer; Silicone Copolymer Fluid (Phenylmethyl/Dimethyl); Phenyl Methyl Silicone Fluid (Modified); Dow Corning® 556 Fluid (Analog); Phenylmethyl polysiloxane copolymer
EINECS	Contact for details

Quality Control

Our (50% Dimethylsilane) (50% Phenylmethylsilane) Copolymer is produced under a strict quality management system. Each batch undergoes comprehensive analysis to ensure consistent viscosity, phenyl content, and functional performance. Certificates of Analysis (COA) detailing key specifications such as viscosity, refractive index, specific gravity, and volatile content are provided and 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). Keep away from strong oxidizing agents, acids, and bases. Under recommended storage conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Complies
Viscosity @ 25°C (cSt)	100 - 10,000 (Grade Dependent)
Refractive Index @ 25°C	1.46 - 1.52
Specific Gravity @ 25°C	0.98 - 1.10
Phenyl Content (mol%)	45 - 55
Volatile Matter (%)	≤ 2.0

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