Description

1,15-Dihydroxy Hexadecamethyl Octasiloxane is a high-purity, linear siloxane diol functionalized with terminal hydroxyl groups. This unique structure provides excellent reactivity and serves as a versatile building block for synthesizing advanced silicone polymers and copolymers. It is essential for manufacturers in the personal care, coatings, and specialty chemical industries seeking to create high-performance, tailored materials with specific surface-active or release properties.

Application

• Silicone Polymer Synthesis: A key intermediate for the production of high molecular weight linear and branched silicone fluids, resins, and elastomers.
• Personal Care Formulations: Used in the synthesis of silicone-based surfactants, emulsifiers, and conditioning agents for premium hair care and skincare products.
• Release Coatings: Acts as a precursor for cross-linkable silicone polymers used in pressure-sensitive adhesive release liners for labels and tapes.
• Surface Modification: Employed to create functional siloxane coatings that impart water repellency, lubricity, or anti-foaming properties to various substrates.
• Pharmaceutical Intermediates: Utilized in the synthesis of specialized silicone excipients for controlled drug delivery systems.
• Adhesives & Sealants: Serves as a reactive modifier to enhance the flexibility, weatherability, and adhesion properties of industrial adhesives and sealants.

Basic Information

Item	Detail
Product Name	1,15-Dihydroxy Hexadecamethyl Octasiloxane
CAS No.	4938-87-8
Molecular Formula	C16H50O17Si8
Molecular Weight	727.36 g/mol
Synonyms	Hexadecamethyl-1,15-dihydroxyoctasiloxane; α,ω-Dihydroxyhexadecamethyloctasiloxane; Octasiloxane, 1,15-dihydroxyhexadecamethyl-; Hydroxy-Terminated Polydimethylsiloxane (PDMS) Diol (DP~8); Linear PDMS Diol; Siloxane Diol; Silanol-Terminated Siloxane; Dow Corning® Q1-3563 (similar type); Shin-Etsu® X-22-160AS (similar type)
EINECS	225-591-9

Quality Control

Our 1,15-Dihydroxy Hexadecamethyl Octasiloxane is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for hydroxyl value, viscosity, and purity. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to guarantee consistency and 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). This material is hygroscopic (moisture-sensitive); ensure containers are kept sealed to prevent absorption of atmospheric moisture, which can affect reactivity.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (by OH Value)	≥ 98.0 %
Viscosity @ 25°C	Contact for details
Water Content (Karl Fischer)	≤ 0.1 %
Refractive Index @ 20°C	Contact for details
Specific Gravity @ 25°C	Contact for details

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