What is Polyurethane?
Polyurethanes are a general term that is used for a wide range of polymers but they are specifically high molecular weight polymers which are based on Isocyanate chemistry. All Urethanes are produced with a reaction between 3 components:

• A Polyol (PPG, PTMEG and Polyester)
• An Isocyanate (TDI, MDI, NDI)
• A cross-linker / Chain extender (Diamine, Diol and Triols)

In General the Polyol and Isocyanate parts are preblended liquids called Pre-polymers. This is then hand or machine blended with the cross linker, poured into a mould and cured to produce the end component.

There are many different families of polyurethanes, for example; Castable Elastomers, Rigid and Flexible foam, Adhesives, Sealants & Coatings.

Handles Urethane Products specialise in manufacturing castable Polyurethane products, which are true engineering materials. Castable Polyurethanes are true elastomers, the definition of which is a material that can be extended to at least twice its length and then return to its original form.

Why Polyurethanes? 
The major characteristic of these Polyurethanes are their extraordinary physical properties and the variety of strengths that are available between the different families of urethanes. There are two main reasons for using polyurethanes; their physical performance and their cost effectiveness. Below is a chart detailing the advantages of using Urethanes over other materials.

Polyurethanes advantages over other materials

It is always advisable to discuss your specific application with an advisor about the best material for your specific application.