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TDS: Polyurethane MDI (PU) [Polyether]

Make informed choices using our technical data insights.


Polyurethane MDI (PU) [Polyether]

General Information:

  • Product Name: MDI Polyether Polyurethane (PU) Elastomers
  • Classification: Elastomeric polymer, thermoset
  • Composition: Based on methylene diphenyl diisocyanate (MDI) and polyether polyols


Typical Properties:

  • Density: 1.10 – 1.20 g/cm³ (varies with formulation)
  • Tensile Strength: 20 – 50 MPa (depending on formulation)
  • Elongation at Break: 300 – 650%
  • Tensile Modulus: 15 – 100 MPa
  • Hardness: Shore A 65 – Shore D 60
  • Tear Strength: 45 – 160 kN/m
  • Compression Set: 5 – 35%
  • Hydrolytic Stability: Superior due to polyether polyol structure

Features and Benefits:

  • Hydrolytic Stability: Polyether-based PUs offer better resistance to moisture and aqueous environments compared to polyester-based PUs.
  • Flexibility: Maintains excellent flexibility over a wide temperature range.
  • Abrasion Resistance: Exceptional resistance to abrasion and wear.
  • Low Temperature Performance: Exhibits better low-temperature flexibility than polyester-based PUs.
  • Chemical Resistance: Particularly resistant to weak acids, bases, and various solvents.
  • Good Dynamic Properties: Suitable for applications with dynamic stresses.



  • Industrial: Seals, gaskets, bushings, and conveyor belts in wet environments.
  • Automotive: Dampers, engine mounts, seals, and interior components.
  • Marine: Components exposed to seawater and buoyancy aids.
  • Mining and Construction: Wet environment liners, hydrocyclones, and screen mats.
  • Sporting Goods: Water-resistant footwear soles, aquatic equipment.
  • Medical: Tubing, catheters, and implants.

Processing Methods:

  • Casting: Typical for complex or specific geometries.
  • Injection Moulding: For mass production of components.
  • Reaction Injection Molding (RIM): Particularly for larger or detailed parts.


Environmental Impact and Recycling:

  • As thermosets, MDI polyether PU elastomers are more challenging to recycle compared to thermoplastics.
  • Waste reduction can be achieved by optimising production processes and reusing production scrap.
  • Innovations in chemical recycling methods, such as glycolysis, are being explored to improve recyclability.

Storage and Handling:

  • Store in a cool, dry place. Direct sunlight can degrade the PU over time.
  • When handling raw materials (especially MDI), proper precautions must be taken as they can be reactive and potentially harmful.


Safety Information:

  • Once cured, MDI polyether PU elastomers are non-toxic.
  • During processing, ensure adequate ventilation and utilise proper protective equipment to prevent exposure to isocyanates.
  • MDI-based PU is flammable. When burned, it can release toxic gases. Adequate fire safety measures should be in place.

Note: This technical data sheet provides general information and typical values for MDI polyether PU elastomers. Actual specifications may vary depending on the manufacturer and specific product grade. Always refer to the manufacturer’s data sheets for precise information on a particular product.

Disclaimer: The information given is “as is” without any warranties. Users are encouraged to conduct their own tests and evaluations for specific applications.

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