Description

Poly(Dimethylsiloxane), Bis(Hydroxyalkyl) Terminated is a reactive, hydroxyl-terminated silicone polymer, also known as a silicone diol. This compound is valued for its ability to act as a flexible spacer or soft segment, imparting unique properties like hydrophobicity, thermal stability, and low surface energy when incorporated into polymer systems. It is a critical intermediate for manufacturers in the polyurethane, coatings, and specialty elastomer industries seeking to enhance product performance and durability.

Application

• Polyurethane Modification: Used as a soft segment or chain extender to create silicone-polyurethane copolymers with improved hydrolytic stability, flexibility, and biocompatibility for medical devices, coatings, and adhesives.
• Silicone Copolymer Synthesis: Serves as a key monomer for synthesizing various silicone-organic hybrid polymers, including silicone polyethers and silicone polyesters.
• Surface Modifying Additive: Incorporated into coatings, films, and fibers to impart permanent water repellency, release properties, and enhanced surface slip.
• Pressure-Sensitive Adhesives (PSAs): Modifies adhesive formulations to achieve a balance of tack, peel strength, and temperature resistance.
• Release Coatings: A precursor for cross-linked silicone release liners used in labels, tapes, and graphic films.
• Elastomer Precursor: Used in the production of high-performance silicone rubbers and gels, particularly where reactive hydroxyl end-groups are required for curing.

Basic Information

Product Name	Poly(Dimethylsiloxane), Bis(Hydroxyalkyl) Terminated
CAS No.	156327-07-0
Molecular Formula	CnH2n+2O3Sin/2 (Variable, n depends on chain length)
Molecular Weight	Variable (Contact for details on specific grade/viscosity)
Synonyms	α,ω-Bis(hydroxyalkyl)polydimethylsiloxane; Hydroxyalkyl-Terminated Polydimethylsiloxane; Silicone Diol; PDMS Diol; Hydroxy-Functional Silicone Fluid; Bis(hydroxyalkyl)-Terminated PDMS; Poly(dimethylsiloxane-co-methylhydrogensiloxane), α,ω-bis(hydroxyalkyl) terminated; Polydimethylsiloxane, hydroxylalkyl terminated
EINECS	Contact for details

Quality Control

Our Poly(Dimethylsiloxane), Bis(Hydroxyalkyl) Terminated is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency in hydroxyl value, viscosity, molecular weight distribution, and purity. Certificates of Analysis (COA) documenting these parameters are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong acids and organic solvents. Under these conditions, the product is stable for extended periods.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Hydroxyl Value (mg KOH/g)	As per grade (Contact for details)
Viscosity (cSt @ 25°C)	As per grade (Contact for details)
Water Content (KF)	< 0.1%
Specific Gravity (25°C)	0.95 - 0.98
Refractive Index (n20D)	1.400 - 1.410

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