Polyurethane casting resin

What is Polyurethane casting rubber or casting resin?

The Polyurethane rubber is a softer variety among the Thermosets which is formed from two components. This flexible casting rubber has a varying hardness from Shore A 20 to Shore A 95 and can be even harder in a number of cases. The casting resin resins are the hard thermosets that also consist of two components. These hard casting plastics are available in hardnesses varying from Shore D 45 to 90.
The PUR has the property of adhering to many materials when no release agent is used. An exception is Silicone material. We therefore recommend using a silicone mold for processing PU.
The advantages of polyurethane rubber:

• Very strong
• Simple processing
• Slow processing / curing with rubbers
• Easy to color
• Relatively inexpensive / cheap
• Zero shrinkage
• Wear resistant
• Many rubbers can be processed by machine
• Shore A hardness 20 to 90+
• Can be thickened for brush-on molds

The advantages of polyurethane resins:

• Very strong
• Simple processing
• Fast curing
• Can be mixed with fillers such as metal powders
• Easy to color
• Versatile in use

Syntecshop.com has a type of rubber or resin for every application. The choice of a type of rubber depends entirely on the application, and when making rubber molds on which surface are you going to pour and brush the rubber? For example, your model can be made of stone, glass, metal, wood, wax, ceramic or plaster.
Then it is also important to determine in advance which material you want to make the casts from, this could be plaster, concrete, wax, epoxy, polyester, polyurethane or a low-melting alloy.

This is necessary to prevent problems such as:

• no or poor curing of the silicone or polyurethane
• surface reaction / inhibition of the final cast product
• mutual adhesion of the materials etc.

So always pay attention and make the right choice and  make teste before starting. You can also contact one of our employees for advice!

* The mixing time, pot life and pouring time depend on the temperature, the environment and the relative humidity value and with resins depending on the volume.

Through years of experience and development, SynTec offers a wide choice of casting rubbers and casting resins on a polyurethane basis, among other things. The PU materials are diverse with a choice of various technical properties such as hardnesses, processing times, durability, elongation and fracture strengths, machinability and can be used for many applications. Many rubbers vary in hardness, soft, medium and hard to extremely hard between Shore A 20, 25, 30, 40, 45, 50, 60, 70, 75, 80, 85 and 70 up to over 100. Do you need help If you need to make a choice for the rubber material for your application or for assistance with its processing, please contact us.