What’s the difference between rotocasting and rotational moulding?

December 21, 2021

man roto moulding

Within the manufacturing industry there are many different moulding processes used every day to make a variety of products and goods for use across all sectors. Two of the most common are rotocasting and rotational moulding (often known as roto moulding).

As experts in plastic manufacturing here at excelsior, we’ve taken these two examples, explained more about what they are, and at the same time, the key differences between them. That means if you’re considering changing up your current manufacturing processes or rolling out some new ones, you can help determine which option would be best for your business.

Rotational moulding explained

This is our forte here at Excelsior, so you can count on us to know every last step of the process down to the very last detail! For now, we’ll just stick to the basics: the process of rotational moulding involves steadily heating a heated mould cavity which gets filled with a moulding material and is then (as the name suggests) rotated at high speed. As this rotation happens the material gets pushed outwards via centrifugal force onto the heated mould cavity forming the required shape. The use of this force helps to ensure the material is spread and coated around the cavity evenly to produce a neat finish.

Rotational moulding is also a great choice if you want to make products quickly and cost-effectively, and is particularly good for making complex and/or hollow parts.

Rotocasting explained

The moulding process with rotocasting sees a self-curing resin being placed on the inside of a mould cavity – and in a similar vein to rotational moulding – this is also then rotated and sees the product formed into shape via centrifugal force. What’s more, the rotation is again used to ensure the resin forms an even coating around the mould cavity.

A quick look at the further differences

Beyond the clear difference of rotational moulding involving the mould for the materials being heated, there are some other differences between these two processes. The key example here is the materials that are used, with the self-curing resin used in rotocasting being something that automatically hardens by itself to form the product.

A further difference with the heated mould used within rotational moulding is that it means the materials then have a low viscosity and therefore a lower resistance to the cavity. In turn this makes it easier – and therefore more efficient – for the material to be spread around the mould cavity during the overall manufacturing process.

With 100 years of experience, you can count on us to help

If you have an upcoming project and you feel that roto moulding is the right choice, then you’ll be pleased to know this is also something we can support you with. Our exceptional roto moulding services have been used by many companies across many sectors and with over 100 years of history behind us, you can trust us to deliver the quality products your customers will expect.

Find out more by having a look over our case studies and feel free to give us a call on 0161 765 2010 to see how we can help you.