What are Cast Elastomers?

A polymer becomes an elastomer when it possesses elastic characteristics, much like rubber.

Polyurethane is often referred to as PU.

Polyurethane cast elastomers can be many things: they can be strong, stiff, flexible, tough, resilient, durable, long-lasting and viscoelastic.

Polyurethane (PU) cast elastomer is a polymeric chemical compound that is formed through the reaction of a di isocyanate and a multifunctional polyol, glycol and/or amine.

Polyurethane elastomers while an important polymeric material used extensively in engineering applications,  are a small part of the polyurethane (PU) group of materials.

Polyurethane elastomers are formed by combining an isocyanate such as (methylene diphenyl diisocyanate) MDI, or (toluene diisocyanate) TDI, and a polymeric polyol - by changing these constituents and their ratio - the qualities of the polyurethane elastomers are exploited and formulated.

Additives such as pigments, flame retardants and/or fillers can also be added to the formulation.


Advantages of using NEUTHANE TM cast elastomers …

  • resistance to abrasion
  • high tensile and tear strength
  • resistance to seawater and chemicals (oil, fuel, gas)
  • high load-bearing capacity
  • oxidation resistance
  • transparency
  • adhesiveness
  • shape retention
  • operating temperature (of the finished product) -60C° to 95C °
  • wide hardness range
  • strong adhesive
  • flexible
  • electric insulating properties
  • noise dampening properties


Polyurethane elastomer is moulded via the reaction injection moulding (RIM) process.

The two or more liquid components, (isocyanate, polyol and additives), are metered through a mixing chamber and injected or poured into a mould where the chemical reaction of the components takes place to form an elastomeric solid material.

Also, elastomers are highly mouldable and stable allowing the production of large and/or detailed parts.

NEUTHANE elastomer moulded parts can be highly specified and cast to the most exacting of customer specifications.