Description

Polyoctamethylene Oxide CAS NO 50862-53-8 is a high-purity, linear polyether glycol characterized by its well-defined molecular structure and terminal hydroxyl functionality. This compound is valued for its role as a versatile building block in polymer synthesis, offering excellent flexibility, hydrolytic stability, and compatibility in formulated systems. It is essential for manufacturers in the polyurethane, specialty elastomer, and advanced material sectors seeking consistent performance and reliable supply chain partners.

Application

• Polyurethane Elastomers & Thermoplastics (TPU): Serves as a key soft segment polyol, imparting flexibility, resilience, and low-temperature properties to high-performance elastomers, adhesives, and coatings.
• Specialty Copolymers: Used as a macrodiol initiator or co-monomer for synthesizing block copolymers, including polyetherester and polyetherurethane materials.
• Lubricants & Functional Fluids: Employed as a base or additive in synthetic lubricants and hydraulic fluids due to its thermal stability and low pour point.
• Surface Active Agents & Dispersants: Acts as a hydrophilic segment in the production of non-ionic surfactants, emulsifiers, and pigment dispersants.
• Pharmaceutical & Cosmetic Excipients: Utilized in controlled-release drug delivery systems and as a humectant or solvent in cosmetic formulations, where high purity is critical.
• Sealants and Casting Compounds: Provides enhanced flexibility and durability in moisture-cured and two-component sealant systems.

Basic Information

Product Name	Polyoctamethylene Oxide
CAS No.	50862-53-8
Molecular Formula	C8nH16n+2On+1 (n typically 1-100+)
Molecular Weight	Variable (typically 250-4000 g/mol). Contact for details on specific grades.
Synonyms	Poly(oxy-1,8-octanediyl), α-Hydro-ω-hydroxypoly(oxy-1,8-octanediyl); 1,8-Octanediol homopolymer; Poly(octamethylene glycol); Poly(1,8-octylene oxide); Octamethylene Glycol Polymer; PTMO (PolyTetramethylene Oxide) higher homolog; PEG-8 Homopolymer
EINECS	Contact for details.

Quality Control

Our Polyoctamethylene Oxide is produced under a strict quality management system. Each batch is subjected to rigorous analytical testing to ensure it meets precise specifications for hydroxyl value, molecular weight distribution, water content, and acidity. A comprehensive Certificate of Analysis (COA) documenting identity, purity, and key physical properties is available for every shipment to support your quality assurance protocols.

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). This product is hygroscopic (moisture-sensitive). To prevent moisture absorption and potential degradation, containers must be kept tightly sealed when not in use and under a dry inert atmosphere (e.g., nitrogen) for long-term storage.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms
Hydroxyl Value (mg KOH/g)	As per grade (e.g., 56.1, 112.2)
Water Content (KF)	≤ 0.1 %
Acid Value (mg KOH/g)	≤ 0.1
Molecular Weight (GPC)	As per grade (e.g., 1000, 2000)
Polydispersity Index (PDI)	≤ 1.1
Viscosity @ 40°C (cSt)	Reported on COA

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