Description

Heptaethylene Glycol CAS NO 5617-32-3 is a high-purity, water-soluble polyethylene glycol (PEG) derivative characterized by its seven repeating ethylene oxide units. This compound serves as a versatile, non-toxic, and inert chemical intermediate and formulation component across multiple high-value industries. It is essential for manufacturers and R&D facilities in pharmaceuticals, personal care, and specialty chemicals who require a reliable, high-quality polyether building block for synthesis, solubilization, and modification.

Application

• Pharmaceutical Intermediate: Used in the synthesis of prodrugs, linker molecules for antibody-drug conjugates (ADCs), and as a solubilizing agent in drug formulations.
• Polymer & Resin Modifier: Acts as a chain extender, plasticizer, or cross-linking agent in polyurethane, epoxy, and polyester resin systems to modify flexibility and hydrophilicity.
• Personal Care & Cosmetics: Functions as a humectant, emollient, and viscosity modifier in creams, lotions, and serums due to its excellent moisture-binding properties.
• Chemical Synthesis: Serves as a starting material or spacer for creating surfactants, lubricants, and functionalized PEG derivatives.
• Bioconjugation & Life Sciences: Employed in the PEGylation of proteins, peptides, and nanoparticles to enhance stability, solubility, and circulation time.
• Industrial Fluids & Lubricants: Used as a base or additive in synthetic lubricants, heat transfer fluids, and hydraulic fluids.

Basic Information

Product Name	Heptaethylene Glycol
CAS No.	5617-32-3
Molecular Formula	C14H30O8
Molecular Weight	326.38 g/mol
Synonyms	2,2'-(Oxybis(ethane-2,1-diyl))bis(oxy))diethanol; 3,6,9,12,15,18,21-Heptaoxatritriacontane-1,23-diol; PEG 350; Poly(ethylene glycol) 350; PEG-7; 7-Mer PEG; Heptaethylene glycol; Triethylene glycol, dimer; Ethanol, 2,2'-[1,2-ethanediylbis(oxy-2,1-ethanediyloxy-2,1-ethanediyloxy)]bis-
EINECS	227-049-9

Quality Control

Our Heptaethylene Glycol is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay (HPLC), identity confirmation (IR, NMR), and impurity profiling, to ensure it meets stringent purity specifications. Certificates of Analysis (COA) documenting all test results are provided and available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product quality. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
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.