Description

1,7-Tetrasiloxanediol, 1,1,3,3,5,5,7,7-Octamethyl- is a high-purity, linear siloxane diol functional fluid with reactive hydroxyl end groups. This compound is a valuable silicon-based intermediate and building block, prized for its ability to modify surface properties and act as a crosslinker in advanced polymer systems. It is essential for manufacturers in the silicone elastomer, specialty coatings, and release agent industries seeking to enhance product performance and durability.

Application

• Silicone Elastomer & Rubber Crosslinking: Serves as a chain extender or crosslinking agent in the production of high-performance silicone rubbers (HTV, RTV) to improve mechanical properties.
• Specialty Coatings & Surface Modifiers: Used as a key intermediate in formulating water-repellent, anti-adhesive, and release coatings for textiles, paper, and industrial surfaces.
• Silicone Resin & Polymer Synthesis: Acts as a reactive monomer for constructing tailored polysiloxane copolymers, resins, and block polymers with specific functionalities.
• Adhesive & Sealant Formulations: Incorporated into silicone-based adhesives and sealants to regulate viscosity, enhance adhesion, and control cure profiles.
• Personal Care & Cosmetic Ingredients: Utilized as a precursor for synthesizing silicone surfactants and emollients that provide smooth, non-greasy feel in cosmetic products.
• Lubricant & Anti-foam Additives: Functions as a base fluid or additive in specialty lubricants and anti-foaming agents for industrial processes.

Basic Information

Product Name	1,7-Tetrasiloxanediol, 1,1,3,3,5,5,7,7-Octamethyl-
CAS No.	3081-07-0
Molecular Formula	C8H26O5Si4
Molecular Weight	310.65 g/mol
Synonyms	Octamethyltetrasiloxane-1,7-diol; 1,1,3,3,5,5,7,7-Octamethyl-1,7-dihydroxytetrasiloxane; Tetrakis(dimethylsiloxy)silane, dihydroxy-terminated; Dihydroxy-terminated polydimethylsiloxane (DP=2); α,ω-Dihydroxyoctamethyltetrasiloxane; PDMS Diol (n=2); Siloxanediol, octamethyltetra-; Linear siloxane diol
EINECS	221-374-5

Quality Control

Our 1,7-Tetrasiloxanediol, 1,1,3,3,5,5,7,7-Octamethyl- is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure high purity, consistent reactivity, and batch-to-batch reliability. Key parameters such as hydroxyl value, viscosity, and silanol content are closely monitored. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to support your quality assurance protocols.

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). This product is hygroscopic (moisture-sensitive). Ensure containers are kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect product performance. Keep away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.1%
Hydroxyl Value	Contact for details
Viscosity @ 25°C	Contact for details
Refractive Index @ 20°C	Contact for details
Density @ 25°C	Contact for details

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