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TDS: Polyurethane TDI (PU) [Polyester]

Make informed choices using our technical data insights.


Polyurethane TDI (PU) [Polyester]

General Information:

  • Product Name: TDI Polyester Polyurethane (PU) Elastomers
  • Classification: Elastomeric polymer, thermoset
  • Composition: Derived from toluene diisocyanate (TDI) and polyester polyols


Typical Properties:

  • Density: 1.14 – 1.24 g/cm³ (depending on formulation)
  • Tensile Strength: 30 – 60 MPa (based on formulation)
  • Elongation at Break: 250 – 650%
  • Tensile Modulus: 20 – 120 MPa
  • Hardness: Shore A 75 – Shore D 60
  • Tear Strength: 55 – 175 kN/m
  • Compression Set: 5 – 28%
  • Hydrolytic Stability: Generally less than polyether-based PUs but suitable for many applications

Features and Benefits:

  • Abrasion Resistance: Excellent resistance to wear, making it apt for demanding applications.
  • Chemical Resistance: Offers significant resistance to oils, greases, and various solvents.
  • UV Resistance: Polyester-based PUs often have superior UV degradation resistance compared to polyether-based variants.
  • Heat Aging: Generally shows better heat aging properties than polyether-based PUs.
  • High Mechanical Strength: Suitable for high-load and high-stress applications.


  • Industrial: Drive belts, rollers, and bushings.
  • Automotive: Tires, gaskets, suspension components, and belts.
  • Mining and Construction: Abrasion-resistant components, liners, etc.
  • Sporting Goods: Durable footwear soles, outdoor equipment.
  • Medical: External prosthetics and certain protective gear.
  • General Purpose: Outdoor applications, coatings, and films.


Processing Methods:

  • Casting: Preferred for specific geometries and parts.
  • Injection Moulding: Common for mass production of components.
  • Reaction Injection Molding (RIM): Ideal for intricate or larger parts.

Environmental Impact and Recycling:

  • Being thermosets, TDI polyester PU elastomers present recycling challenges in comparison to thermoplastics.
  • Efficiencies in production processes and repurposing scrap can minimise waste.
  • Investigations into chemical recycling methods like glycolysis are ongoing to improve recyclability.


Storage and Handling:

  • It’s recommended to store in a cool, dry environment, away from UV light which can degrade the PU.
  • TDI, as a raw material, demands careful handling due to its reactivity and potential health hazards.

Safety Information:

  • Once fully cured, TDI polyester PU elastomers are generally deemed non-toxic.
  • During production, ensure proper ventilation and wear protective equipment to avoid isocyanate exposure.
  • Being flammable, they should be kept away from open flames. If combusted, harmful gases might be released.

Note: This sheet offers a general overview and typical values for TDI polyester PU elastomers. The actual specifications might vary based on manufacturer and product grade. For precise information on a specific product, always consult the manufacturer’s data sheets.

Disclaimer: The provided information is “as is” without any warranties. For specific applications, users are encouraged to conduct their tests and evaluations.

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