Description

1,1,1,5,7,7,7-Heptamethyl-3,3-Bis CAS NO 38147-00-1 is a specialized organosilicon compound characterized by its unique branched molecular structure. This chemical is valued for its role as a versatile intermediate and functional additive in advanced material synthesis. It is primarily sought by R&D and manufacturing professionals in the silicone polymer, specialty coatings, and adhesive industries seeking to modify material properties such as hydrophobicity, thermal stability, and cross-linking density.

Application

• Silicone Polymer Modification: Acts as a functional chain extender or cross-linking agent to tailor the flexibility, strength, and thermal properties of silicone rubbers and resins.
• Specialty Coatings & Sealants: Imparts enhanced water repellency (hydrophobicity) and weather resistance to high-performance coatings and construction sealants.
• Adhesive Formulations: Used as an additive to improve adhesion, cohesion, and environmental durability in silicone-based adhesive systems.
• Release Agent Intermediate: Serves as a key precursor in the synthesis of silicone-based release agents for industrial and packaging applications.
• Personal Care & Cosmetic Ingredients: Employed in the synthesis of silicone fluids and elastomers used in skincare and haircare products for their smooth, non-greasy feel.
• Pharmaceutical & Medical Device Components: Utilized in the production of biocompatible silicone materials for medical tubing, implants, and drug delivery systems.
• Electronics Encapsulation: Functions as a component in silicone gels and potting compounds that protect sensitive electronic components from moisture and mechanical stress.

Basic Information

Product Name	1,1,1,5,7,7,7-Heptamethyl-3,3-Bis
CAS No.	38147-00-1
Molecular Formula	C11H26O2Si2
Molecular Weight	246.50 g/mol
Synonyms	1,1,1,5,7,7,7-Heptamethyl-3,3-bis(trimethylsiloxy)tetrasiloxane; 1,1,1,5,7,7,7-Heptamethyl-3,3-bis(trimethylsiloxy)-1,5,7-trisiloxane; Tetrasiloxane, 1,1,1,5,7,7,7-heptamethyl-3,3-bis(trimethylsiloxy)-; 3,3-Bis(trimethylsiloxy)-1,1,1,5,7,7,7-heptamethyltetrasiloxane; MD'M (where D' = (CH3)3SiO1/2 substituted); Heptamethyltrisiloxane, 3,3-bis(trimethylsiloxy)-; Silicone fluid intermediate
EINECS	Contact for details

Quality Control

Our production of 1,1,1,5,7,7,7-Heptamethyl-3,3-Bis adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. All materials undergo rigorous analytical testing, including chromatography (GC/HPLC) and spectroscopic methods, to verify identity, purity, and the absence of critical impurities. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment, and we support compliance with relevant global regulatory frameworks.

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). Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed when not in use to prevent degradation from atmospheric moisture. Keep away from incompatible materials such as strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 97.0%
Refractive Index (n20D)	1.390 - 1.400
Density (20°C)	0.90 - 0.95 g/cm³
Water Content (KF)	≤ 0.1%

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