Polyurethane Casting & Moulding
Polyurethanes (PUs) are in a polymer class of their own. Polyether or polyester polyurethanes can be made depending on the choice of co-monomers used to produce them. PUs form a considerable part of the high-performance rubbers and plastics family. They combine the desired benefits of rigid materials with the elasticity of rubbers, bridging the gap between rubbers and plastics in the many industry sectors served by these versatile polymers.
PU rubber used in our polyurethane casting processes can easily be coloured, unlike regular millable rubbers and still exhibit better abrasion properties. Special materials can be added to obtain specific properties such as electrical conductivity. Polyether PUs are more resistant to hydrolysis than their polyester counterparts, giving them better water resistance.
In general, PU rubber is highly abrasion-resistant, from a hardness of 65 Shore A through to 75 Shore D! They are resistant to oxidation, ozone, sunlight & petroleum-based fuels & oils. PUs are generally considered to be chemical resistant polymers. Strong acids, alkalis and some strong solvents are to be avoided. PUs find continuous use in temperatures of up to 90°C with excursions to as high as 120°C. The resilience of PUs vary dramatically & can be tailored for specific applications.
Polyurethane Casting & Moulding
Yes! All rubbers or elastic materials are available in a range of colours.
Depending on the application, we would recommend certain polymers that will retain their colour in service. Some polymers discolour and/or fade under the influence of Ultra Violet (UV) & artificial lighting, but we can advise on this.
Carbon black is widely used as a reinforcing filler that renders the parts black in colour – it is cost-effective & efficient at providing the correct balance of processing & physical properties required for any given application.
Non-black mineral fillers such as silicates, silicas, clays, and calcium carbonates, to name a few, can be used to produce coloured or non-black rubbers – products can be made colourfast at a cost.
All of the products from our polyurethane casting processes can be used outdoors.
Thanks to the high levels of durability and weather resistance associated with polyurethanes, they’re perfect for use outside. This even includes environments of high temperatures and altitudes.
As a rubber, polyurethane can be ground up and reconstituted into something different.
Rubber can be divided into two main categories: thermoset & thermoplastic (TPE, TPV, TPR).
Thermoplastic rubbers can be used, reused, or recycled. However, they are generally used at ambient temperatures and for consumer applications.
Thermoset rubbers are either discarded after first use or ground up and reconstituted into something different and of lower value.
Thermoplastic materials are easier to recycle than their thermoset counterparts – thermoplastics products are formed by a two-way reaction, whilst thermoset rubbers are made using a one way, non-reversible reaction.
Any questions? Get in touch
Since 1895 DLR has been combining expansive knowledge of materials, their properties, and processing techniques to develop bespoke mouldings and fabrications for many industry sectors. Our core services include moulding rubber, rubber sheeting, Petroseals, and cast polyurethane products. If you have any questions about our products, our process or the materials we use get in touch today!