Description

1,1,3,3-Tetramethyldisiloxane is a versatile organosilicon compound characterized by its linear disiloxane structure with terminal methyl groups. This chemical serves as a fundamental building block and reactive intermediate in the synthesis of more complex silicone polymers and functional silanes. It is particularly valuable for industries requiring precise molecular control and high-purity starting materials, such as advanced materials science and specialty chemical manufacturing. Its properties make it essential for creating tailored silicone-based products with specific performance characteristics.

Application

• Silicone Polymer Synthesis: Acts as a key monomer or chain extender in the production of polydimethylsiloxanes (PDMS) and other silicone oils, elastomers, and resins.
• Surface Modification Agent: Used to impart hydrophobic properties to surfaces like glass, silica, and metals through silylation reactions.
• Precursor for Functional Silanes: Serves as a starting material for manufacturing more complex organofunctional silanes used in adhesives, sealants, and coatings.
• Pharmaceutical & Cosmetic Intermediates: Employed in the synthesis of silicone-based ingredients for personal care products and controlled-release drug delivery systems.
• Laboratory Reagent: Utilized in research and development for organic synthesis, catalysis, and materials science due to its reactive Si-H bonds.
• Electronics & Semiconductor Industry: Used in chemical vapor deposition (CVD) processes and as a precursor for silicon-containing thin films and dielectric materials.

Basic Information

Item	Detail
Product Name	1,1,3,3-Tetramethyldisiloxane
CAS No.	3277-26-7
Molecular Formula	C4H14OSi2
Molecular Weight	134.33 g/mol
Synonyms	Tetramethyldisiloxane; 1,3-Dihydro-1,1,3,3-tetramethyldisiloxane; Bis(dimethylsilyl) ether; Disiloxane, 1,1,3,3-tetramethyl-; HMDSO (common abbreviation); Dimethylsiloxane dimer; Contact for additional trade names.
EINECS	221-918-2

Quality Control

Our 1,1,3,3-Tetramethyldisiloxane is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including gas chromatography (GC) for assay and impurity profiling, to meet exacting customer specifications. Certificates of Analysis (COA) documenting identity, purity, and key physical properties are provided with every shipment and are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and incompatible materials. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is 2-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 98.0%
Density (20°C)	0.76 - 0.78 g/mL
Refractive Index (n20D)	1.372 - 1.376
Water Content (KF)	≤ 0.1%

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