Market: Adhesives & Sealants, Coatings-Construction, Coatings-Industrial, Construction Coatings, Elastomers-Thermoplastic, General Industrial Adhesive, General Industrial Coatings, Rubber/Cast Polymers/Composites
Product Category: Intermediates
Supplier: BASF
Technical Information

PolyTHF (PTMEG) is a hygroscopic polymer made up of linear diols with a backbone of repeating tetramethylene units which are connected by ether linkages. The chains in PolyTHF® (PTMEG) are capped with primary hydroxyl units and are produced by polymerizing tetrahydrofuran. It is a white solid that melts into a clear, colourless liquid when heated to between –15 and 30 °C depending on its molecular weight.

PolyTHF is known chemically as polyettramethylenes or PTMEG. It is especially beneficial when used as a building block for soft segment elastomers such as polyurethanes, co-polyetheresters, and co-polyetheramides. Its hydroxyl groups react with other functional groups such as organic acids or isocyanates. The most significant reactions are polyaddition, and polycondensation reactions. Thermoplastic elastomers made with PolyTHF can be processed into finished articles via injection-moulding or extrusion and fiber spinning.

It is an important intermediate in manufacturing thermoplastic polyurethane elastomers (TPU). These products are used for highly abrasion-resistant and flexible hoses, films, and cable sheathing. Other applications include thermo-plastic polyetheresters, polyetheramide, and cast polyurethane elastomers, proven in their use for skateboard wheels and inline skates.

Features & Benefits of PolyTHF (PTMEG)

When used as soft segments for elastomers, PolyTHF provides:

  • Good mechanical properties and excellent resiliency over a wide range of temperatures
  • Low temperature flexibility
  • Superior hydrolytic stability
  • Superior resistance against microbes and fungus attack
  • High abrasion resistance
  • Non-allergenic
  • Superior dynamic properties (minimum heat build-up)
  • High reactivity (bi-functional primary alcohol)
  • High tear strength
  • PolyTHF itself and its prepolymers have comparatively low viscosities, leading to easier processing and handling
  • Prepolymers based on PolyTHF have long shelf lives
ProductPolyTHF 650 SPolyTHF 1000PolyTHF 1400PolyTHF 1800PolyTHF 2000
Molecular (g/mol) 625 – 675 975 – 1025 1350 – 1450 1750 – 1850 1950 – 2050
Hydroxyl number (mgK0H/g) 166.2 – 179.5 109.5 – 115.1 77.4 – 83.1 60.6 – 64.1 54.7 – 57.5
Acid number (mgK0H/g) max. 0.05 max. 0.05 max. 0.05 max. 0.05 max. 0.05
Color (APHA) max. 40 max. 40 max. 40 max. 40 max. 40
Water (ppm) max. 150 max. 150 max. 150 max. 150 max. 150
BHT (ppm) 200 – 350 200 – 350 200 – 350 200 – 350 200 – 350
Density 40 °C
(g/cm3 )
Density 60 °C
(g/cm3 )
Softening point
Tm (°C)
Glass transition
Tg (°C)
 –81 –77 –77 –77 –77
Flash Point (°C)215240242244246

View the PolyTHF brochure for more details














Check out more discoveries from the chemists at Azelis for Coatings, Printing Inks, Construction, and Cast Urethanes!

Our chemists are sharing their discoveries made in Azelis CASE application labs! To learn new ways to solve a formulating problem, get ideas, or ask questions, check out our Chemist Collaboration!

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