Description

1.Basic Product Information

Product Name: PTMEG / Polytetramethylene Ether Glycol

Alias: Polytetramethylene Oxide Glycol, PTG

Molecular Formula: HO-(CH₂)₄O-H

Molecular Weight: Various grades; common range 250 to3000.

CAS No.: 25190-06-1

Molecular Structure:

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Available Grades: PTMEG 650 / 1000 / 1800 / 2000 / 3000 (customizable molecular weight)

2.Product Overview

PTMEG (Polytetramethylene Ether Glycol) is a high-end linear aliphatic polyether polyol polymerized from tetrahydrofuran (THF). Compared with conventional propylene oxide and ethylene oxide-based polyethers, PTMEG features regular linear molecular structure, extremely low crystallinity, excellent hydrolytic stability, superior elasticity and mechanical strength. It is the core raw material for manufacturing high-performance polyurethane elastomers, spandex fibers, and high-grade CASE products. Finished PU materials based on PTMEG deliver outstanding wear resistance, low-temperature flexibility, rebound resilience and anti-aging performance, widely recognized as the premium polyether raw material for high-end PU industries.

3.Typical Specifications

Test Item	Standard Specification
Appearance	Colorless to pale yellow transparent viscous liquid
Hydroxyl Value (mgKOH/g)	Corresponding to different molecular grades
Acid Value (mgKOH/g)	≤ 0.05 max
Moisture Content	≤ 0.02% max
Color Number (APHA)	≤ 40
Viscosity (40℃, mPa·s)	Stable viscosity with excellent processing fluidity
Inhibitor (BHT)	200±50 ppm

4.Physical & Chemical Properties

Physical Properties

PTMEG is a uniform viscous liquid at room temperature with ultra-low color number and high purity. It features regular linear molecular arrangement, moderate viscosity and excellent fluidity. The product presents great compatibility with isocyanates, conventional organic solvents and various PU additives. With low impurity content and stable physical state, it avoids crystallization and stratification during formulation, ensuring consistent processing performance for continuous industrial production.

Chemical Properties

PTMEG contains highly active and evenly distributed terminal hydroxyl groups, which can undergo stable and controllable polycondensation reaction with isocyanate (-NCO). Benefiting from its straight-chain polyether structure without branched chains, it achieves higher cross-linking uniformity after curing. The material possesses outstanding hydrolytic stability, excellent chemical inertness and anti-oxidation performance. Finished PU products exhibit superior low-temperature toughness, abrasion resistance and long-term structural stability, far exceeding ordinary polyether-based PU materials.

5.Main Applications

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9.Finemax Advantages

Finemax Chemical supplies full-specification high-purity PTMEG series products covering mainstream molecular grades. Our PTMEG features ultra-low moisture, stable hydroxyl value, low chroma and excellent batch stability, perfectly matching the production requirements of high-end spandex and high-performance PU elastomers. With strict quality control systems, mature production technology and stable global supply capacity, we provide reliable customized material solutions for premium textile, machinery manufacturing and high-end CASE industries worldwide.

10.Inquiry & Service

Free Sample Support | Custom Molecular Grades | Professional Technical Formula Guidance

Contact us to obtain the latest factory wholesale price and complete technical datasheet.