PTMG (Poly(tetramethylene ether)glycol / PTMG) is a linear polyether glycol with hydroxyl groups on both ends. As a polyol, it reacts readily with isocyanates (for example MDI, TDI), etc. to make resins with excellent properties.

  • Grades:
    PTMG650、PTMG850、PTMG1000、PTMG1300、PTMG1500、PTMG1800、PTMG2000、PTMG3000、PTMG250(under development)、PTMG4000(under development)
  • CAS No.:
  • Japan, Chemical Substances Control Law:
    METI-No. 7-129
  • Japan, Poisonous and Deleterious Substances Control Law:
    Not applicable.
  • Japan, Fire Services Law:
    Hazardous Material Class 4 Petroleums No.3 Hazardous Rank III (PTMG250(under development))
    Hazardous Material Class 4 Petroleums No.4 Hazardous Rank III (PTMG650,850)
    Combustible Materials, Flammable Solids (PTMG1000, 1300, 1500, 1800, 2000, 3000, 4000(under development))




PTMG is a linear polyether glycol with hydroxyl groups on both ends.

Common Names Poly-tetramethylene-ether-glycol
Structure PTMG
CAS No 25190-06-1
Japan, Chemical Substances Control Law METI-No. (7)-129
Japan, Poisonous and Deleterious Substances Control Law Not applicable.
Japan, Fire Services Law
Hazardous Material Class 4 PetroleumsNo.3 Hazardous Rank Ⅲ
(PTMG250(under development))
Hazardous Material Class 4 PetroleumsNo.4 Hazardous Rank Ⅲ
Combustible Materials, Flammable Solids
(PTMG1000,1300,1500,1800,2000,3000,4000(under development))
Example Product PTMG1000 PTMG2000
Appearance White waxy solid
(Clear colorless liquid if melted)
White waxy solid
(Clear colorless liquid if melted)
Odor Almost none Almost none
Avg. Molecular Wt. 1000 2000
* Freezing Point(℃) 17 20
Flash Point(℃) 247 240
Specific Gravity(40/4℃) 0.979 0.976
Viscosity(mPa・s) 320(40℃) 1400(40℃)

* Visual measurement following JIS K0065.3 standard



PTMG 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

Main Applications

Polyurethane Application

  • Polyurethane elastic fibers (Spandex)
  • Polyurethane elastomers
    Thermoset elastomers (TSU)
    Thermoplastic elastomers (TPU)
  • Paints and coatings
  • Adhesives and sealants
  • Artificial suede and synthetic leather

Polyester Applications

  • Polyester elastomers (TPEE)

Polyamide  Applications

  • Polyether amide elastomers

Storage and Handling


PTMG is hygroscopic and will degrade if exposed to oxygen or air, so it should be well-sealed with dry nitrogen.
PTMG 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℃.
PTMG650 and 850 are classified under the Japanese Fire Services Act as hazardous materials, Class 4, Petroleums No.4, Hazardous Rank III.  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 has relatively low toxicity and is relatively safe, use standard protective equipment such as goggles and gloves when handling it.

Lineup / Specifications


Product Specifications

Molecular Weight Hydroxyl value
Acid number
Moisture% Volatiles% Hue
PTMG 650 650±50 160~187 <0.05 <0.03 <0.1 <50
PTMG 850 850±50 125~140 <0.05 <0.03 <0.1 <50
PTMG 1000 1000±50 107~118 <0.05 <0.03 <0.1 <50
PTMG 1300 1300±65 82~91 <0.05 <0.03 <0.1 <50
PTMG 1500 1500±75 71~79 <0.05 <0.03 <0.1 <50
PTMG 1800 1800±100 59~66 <0.05 <0.03 <0.1 <50
PTMG 2000 2000±100 53~59 <0.05 <0.03 <0.1 <50
PTMG 3000 3000±200 35~40 <0.05 <0.03 <0.1 <50
PTMG 250
(under development)
210±25 477.5~606.5 <0.05 <0.05 <0.1 <50
PTMG 4000
(under development)
4000±250 26~30 <0.05 <0.03 <0.1 <50

Available Quantities

Tanker Truckload (Lorry) 10ton / 13ton
Drum 180kg,200kg(depending on grade)
Oilcan 15kg

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