Description

1,3-Bis(3-Hydroxyisobutyl)Tetramethyldisiloxane is a specialized organosilicon compound featuring a central disiloxane backbone flanked by hydroxy-functional isobutyl groups. This unique bifunctional structure, combining siloxane stability with terminal hydroxyl reactivity, makes it a valuable intermediate for synthesizing advanced silicone polymers and modifying material surfaces. It is particularly sought after by formulators and researchers in the personal care, coatings, and specialty chemical industries seeking to impart specific properties like hydrophobicity, flexibility, or crosslinking capability into their products.

Application

• Silicone Polymer Synthesis: A key monomer or chain extender for producing custom silicone polyols, silicone-organic hybrids, and siloxane-based copolymers.
• Personal Care & Cosmetics: Used as a building block for silicone emulsifiers, conditioning agents, and film-formers in hair care, skincare, and color cosmetics to enhance texture, spreadability, and water resistance.
• Surface Modification & Coatings: Serves as a coupling agent or additive to improve adhesion, wetting, and durability in industrial coatings, release coatings, and protective finishes.
• Adhesives & Sealants: Incorporated as a reactive modifier to adjust the rheology, cure profile, and flexibility of high-performance silicone and polyurethane systems.
• Pharmaceutical & Biomedical Intermediates: Utilized in the synthesis of biocompatible silicone materials for controlled drug delivery systems and medical device components.
• Lubricant & Grease Additives: Functions as a precursor for high-temperature stable silicone fluids and greases used in specialized industrial applications.

Basic Information

Item	Details
Product Name	1,3-Bis(3-Hydroxyisobutyl)Tetramethyldisiloxane
CAS No.	29706-30-7
Molecular Formula	C12H30O3Si2
Molecular Weight	278.54 g/mol
Synonyms	1,3-Bis(3-hydroxy-2-methylpropyl)-1,1,3,3-tetramethyldisiloxane; Tetramethyl-1,3-bis(3-hydroxyisobutyl)disiloxane; 3-Hydroxyisobutyl-terminated tetramethyldisiloxane; Bis(3-hydroxyisobutyl)tetramethyldisiloxane; Hydroxy-functional disiloxane; Siloxane diol; CAS 29706-30-7
EINECS	Contact for details

Quality Control

Our production of 1,3-Bis(3-Hydroxyisobutyl)Tetramethyldisiloxane adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including assay, identity confirmation, and impurity profiling. Certificates of Analysis (COA) detailing all specifications are provided and 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). This material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality. Keep away from strong acids and incompatible organic solvents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Refractive Index (n20D)	1.430 - 1.440
Density (20°C)	0.92 - 0.96 g/mL

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