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PTMG 650 is a member of the glycol ether chemical family, is identified as Polytetrahydrofuran. It is available in drums, tanks, and cans, providing flexibility in packaging and storage. PTMG 650 is characterized by its hygroscopic nature and solid physical form.

Chemical Name: Polytetramethylene Ether Glycol

CAS Number: 25190-06-1

Chemical Family: Glycol Ethers, Glycols, Polyols

Hydroxyl Value: 166.0 - 180.0 mg KOH/g

Synonyms: Polyfurite, Polytetrahydrofuran, Poly(butylene oxide), Poly(n-butylene oxide), Poly(oxy-1,4-butanediyl), Poly(oxy-1,4-butanediyl), α-hydro-ω-hydroxy-, Poly(oxy-1,4-butylene) glycol, Poly(oxybutylene) glycol, Poly(oxytetramethylene), Poly(oxytetramethylene) glycol, Poly(oxytetramethylene)diol, Poly(tetrahydrofuran), SRU, Poly(tetrahydrofurandiol), Poly(tetramethylene ether), Poly(tetramethylene ether) glycol, Poly(tetramethylene ether)diol, Poly(tetramethylene glycol), Poly(tetramethylene oxide), Poly(tetramethylene oxide) glycol, Polybutylene glycol, Polyfurit, Polytetramethylene glycol, Polytetramethylene glycol ether with butanediol, Polytetramethylene oxide diol

Knowde Enhanced TDS

Identification & Functionality

Base Chemicals Functions
Structual Formula

PTMG 650 - Structual Formula - 1

Poly(Tetramethylene Ether) Glycol

Features & Benefits

Product Highlights

PTMG 650 shows the following outstanding characteristics as a soft segment of polyurethane and polyester resins. The resins obtained are used over a broad range of applications, from common consumer goods such as garments, to the industrial materials such as machine parts. Applications are expected to continue to grow.

  • Impact resilience
  • Hydrolysis resistances
  • Low temperature flexibility
  • Wear resistance
  • Tear resistance
  • Fungus resistance

Applications & Uses


Physical Form
Colorless transparent liquid, Solid white wax Colorless transparent liquid when melted
Typical Properties
ValueUnitsTest Method / Conditions
Freezing Point11°C-
Flash point237°C-
Specific Gravity (at 40/4°C)0.982--
Viscosity (at 40°C)160mPa.s-
ValueUnitsTest Method / Conditions
Average Molecular Weight (Mn)*600 - 700-Calculated by using hydroxyl value
Colormax. 40HazenSimilar to JIS K 1557 and JIS K 0071-1
Hydroxyl Value166 - 180mgKOH/gSubstantially similar to JIS K 1557
Water Contentmax. 150ppmSubstantially similar to JIS K 1557
Acid Valuemax. 0.05mgKOH/gSubstantially similar to JIS K 0070
Volatile Mattermax. 0.1wt%MCC Method (Total amount of water) , Volatile Gas Chromatography
Butylated Hydroxytoluene Content (as antioxidant)150 - 250ppm-

* - Mn = 112.2 × 1000 / OHV

Regulatory & Compliance

Quality Standards

Packaging & Availability

Packaging Type
Packaging Information





Storage & Handling

Storage and Handling Conditions
  • PTMG 650 is hygroscopic and will degrade if exposed to oxygen or air, so it should be well-sealed with dry nitrogen.
  • PTMG 650 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°C for 24 hours.
  •  Avoid localized heating however.  
  • For storage in the liquid state, it is recommended to maintain temperature at less than 50°C.
  • Volatility is low, and it is unlikely to catch fire at room temperature.  
  • But if it is burning, extinguish the fire with dry chemical, alcohol-resistant foam, or large quantities of water.
  •  Although PTMG 650 has relatively low toxicity and is relatively safe, use standard protective equipment such as goggles and gloves when handling it.