Description

Carbinol (Hydroxyl) Terminated Polydimethylsiloxane is a reactive silicone polymer featuring terminal hydroxyl groups, which serve as versatile sites for chemical modification and crosslinking. This unique structure provides a balance of classic silicone properties—such as low surface tension, thermal stability, and hydrophobicity—with the reactivity needed for advanced material synthesis. It is essential for formulators and manufacturers in the personal care, coatings, adhesives, and specialty polymer industries seeking to enhance product performance through silicone modification.

Application

• Silicone Resin & Elastomer Modification: Acts as a reactive intermediate or chain extender in the production of high-performance silicone resins, rubbers (RTV), and gels.
• Personal Care & Cosmetic Formulations: Used as a key ingredient in hair conditioners, skin care products, and antiperspirants to provide a soft, non-greasy feel and improve spreadability.
• Industrial & Protective Coatings: Incorporated into coating formulations to enhance water repellency, weather resistance, and surface slip properties.
• Adhesives & Sealants: Serves as a reactive component in silicone-based adhesives and sealants, improving flexibility and adhesion to various substrates.
• Release Agents & Mold Making: Utilized in the formulation of non-stick release coatings for industrial molding and food processing applications.
• Pharmaceutical & Medical Device Lubricants: Employed as a base fluid or modifier in lubricants for medical devices due to its biocompatibility and stability.
• Textile & Fiber Treatment: Applied as a softener and water repellent finish for textiles and non-woven fabrics.
• Polymer Additive: Functions as an internal lubricant or processing aid for engineering plastics to reduce viscosity and improve mold release.

Basic Information

Product Name	Carbinol (Hydroxyl) Terminated Polydimethylsiloxane
CAS No.	67674-67-3
Molecular Formula	CnH3n+6On+2Sin (n varies by chain length)
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Hydroxyl-Terminated PDMS; α,ω-Dihydroxypolydimethylsiloxane; Dimethyl Silicone Fluid, Hydroxy Terminated; Polydimethylsiloxane, dihydroxy terminated; OH-Terminated Silicone Oil; Bis(hydroxyalkyl) terminated polydimethylsiloxane; Hydroxyalkyl terminated dimethyl polysiloxane; Silicone glycol copolymer (in some contexts)
EINECS	Contact for details

Quality Control

Our Carbinol (Hydroxyl) Terminated Polydimethylsiloxane is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance, including verification of hydroxyl value, viscosity, molecular weight distribution, and purity. Certificates of Analysis (COA) detailing these specifications are provided with every shipment. We support compliance with relevant global regulatory frameworks, including REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (typically 15-25°C). Keep away from strong acids, bases, and oxidizing agents. Under recommended storage conditions, the product is stable for at least 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
Viscosity (25°C)	Grade dependent (cSt)
Hydroxyl Value	Grade dependent (mg KOH/g)
Water Content	≤ 0.1% (Karl Fischer)
Specific Gravity (25°C)	0.96 - 0.98
Refractive Index (25°C)	1.400 - 1.410
Volatile Matter	≤ 1.0%

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