Description

Octaethylene Glycol Monomethyl Ether is a high-purity, non-ionic surfactant and hydrophilic spacer molecule belonging to the polyethylene glycol (PEG) ether family. Its unique structure, featuring a long, flexible PEG chain capped with a methyl group, provides excellent solubility in water and organic solvents, making it a versatile intermediate and formulation component. This chemical is essential for manufacturers in the pharmaceutical, biotechnology, and specialty chemical sectors who require precise control over hydrophilicity and molecular spacing in their products.

Application

• Pharmaceutical Intermediate: Used as a hydrophilic linker or spacer in the synthesis of prodrugs, antibody-drug conjugates (ADCs), and other bioconjugates.
• Polymer & Resin Modification: Acts as a functional monomer or plasticizer to enhance the flexibility, hydrophilicity, and processing characteristics of various polymers.
• Surface Active Agent: Serves as a non-ionic surfactant, emulsifier, or wetting agent in industrial cleaners, coatings, and agrochemical formulations.
• Chemical Synthesis: Employed as a protecting group or a polar solvent in organic synthesis and catalysis.
• Biotechnology & Diagnostics: Utilized in the surface modification of nanoparticles, quantum dots, and diagnostic assay components to improve aqueous stability and reduce non-specific binding.
• Personal Care & Cosmetics: Functions as a humectant and viscosity modifier in advanced skincare and haircare formulations.

Basic Information

Product Name	Octaethylene Glycol Monomethyl Ether
CAS No.	25990-96-9
Molecular Formula	C17H36O9
Molecular Weight	384.46 g/mol
Synonyms	2-[2-[2-[2-[2-[2-[2-(2-Methoxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol; Polyethylene glycol monomethyl ether (n~8); mPEG8-OH; PEG-8 methyl ether; Methoxyoctaethylene glycol; Heptaethylene glycol monomethyl ether (common misnomer); 3,6,9,12,15,18,21-Heptaoxatritriacontan-1-ol
EINECS	Contact for details

Quality Control

Our Octaethylene Glycol Monomethyl Ether is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including assay by HPLC, to ensure high purity and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as identity, purity, and water content. Our production can adhere to cGMP guidelines for pharmaceutical applications upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at 15-25°C. This material is hygroscopic (moisture-sensitive) and should be handled under a dry atmosphere to prevent degradation. For long-term storage, consider using an inert gas blanket to minimize oxidation.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
pH (5% solution)	5.0 - 7.0
Heavy Metals (as Pb)	≤ 10 ppm

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