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PTMEG (Polytetramethylene Ether Glycol)

PTMEG (Polytetramethylene Ether Glycol) Introduction:

PTMEG Polytetramethylene ether glycol is a waxy, white solid that melts to a clear, colorless, flammable ,viscous liquid near room temperature. Polytetramethylene ether glycol, also known as polytetrahydrofuran, briefly called PTMEG.

Name PTMEG (Polytetramethylene Ether Glycol)
Molecular Formula H(OCH2CH2CH2CH2)nOH
CAS No. 24979-97-3.
Package Tank containers or Galvanized drums


Average Mol wt.
Product 1,000 ± 50 1,800 ± 50 2,000 ± 50 3,000 ± 50
HYDROXYL NUMBER 106  – 118 (mgKOH/g) 60 – 65 (mgKOH/g) 55 – 57 (mgKOH/g) 36 – 39 (mgKOH/g)
COLOR, APHA 30 max
ACID NUMBER 0.05 max (mg KOH/g)
WATER 0.2% max
PEROXIDE 10ppm max
VOLATILES 0.1% max
STABILIZER 250 -350 ppm (Butylated hydroxytoluene)

PTMEG is produced by the catalyzed polymerization of tetrahydrofuran (THF). Relative molecular weight of polytetramethylene ether glycol can be divided into 250, 650, 1000, 1400, 1800, 2000, 3000 and so on. Industrial production can adjust its relative molecular weight according to market demand. So as to produce products of different specifications
Polytetramethylene ether glycol is mainly used to produce polyurethane elastomers, polyurethane elastic fibers (Spandex) and ester ether copolymer elast.


PTMG is hygroscopic and will degrade if exposed to oxygen or air, so it should be well-sealed with dry nitrogen. Polytetramethylene ether glycol is a white, waxy sold at room temperature, but will become a clear, colorless liquid upon heating. If it has solidified in the drum, it can be melted by holding the drum at about 70℃ for 24 hours. Avoid localized heating however. For storage in the liquid state, it is recommended to maintain temperature at less than 50℃.

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