Description

Pentamethyldisiloxane is a highly volatile, low molecular weight organosilicon compound, also known as 1,1,1,3,3-pentamethyldisiloxane. It serves as a versatile and reactive intermediate in organosilicon chemistry, valued for its ability to introduce trimethylsiloxy functional groups. This chemical is essential for manufacturers and R&D facilities in the pharmaceutical, agrochemical, and specialty silicone industries, where it is used in synthesis, surface modification, and as a precursor for more complex siloxane structures.

Application

• Silicone Intermediate: A key building block in the synthesis of more complex siloxane polymers, resins, and fluids.
• Pharmaceutical Synthesis: Used as a protecting agent or silylating reagent in the production of active pharmaceutical ingredients (APIs).
• Surface Modification: Employed to impart hydrophobic properties to surfaces, including glass, silica, and metals.
• Agrochemical Formulations: Acts as an intermediate or additive in the synthesis of certain pesticides and herbicides.
• Crosslinking Agent: Functions as a crosslinker in the production of silicone elastomers and sealants.
• Laboratory Reagent: Utilized in research and development for organic synthesis and material science applications.
• Adhesive & Sealant Precursor: Serves as a precursor in formulations for high-performance adhesives and coatings.

Basic Information

Product Name	Pentamethyldisiloxane
CAS No.	1438-82-0
Molecular Formula	C5H16OSi2
Molecular Weight	148.36 g/mol
Synonyms	1,1,1,3,3-Pentamethyldisiloxane; HMDSO Hydride; Bis(trimethylsilyl) Ether Hydride; Disiloxane, 1,1,1,3,3-pentamethyl-; (Trimethylsilyloxy)trimethylsilane; PMDS; TMS-OSiH(CH3)2
EINECS	215-869-1

Quality Control

Our Pentamethyldisiloxane is produced under strict quality management systems. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity and consistency. A comprehensive Certificate of Analysis (COA) detailing assay, identity, and impurity profiles is provided with each shipment, ensuring full traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. 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
Assay (GC)	≥ 98.0%
Density (20°C)	0.76 - 0.78 g/mL
Refractive Index (n20D)	1.377 - 1.381
Water Content (KF)	≤ 0.1%

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