Why use rotational moulding to make your water tanks?

December 21, 2021

Rotational moulding is ideal for making hollow articles such as water tanks. This is because the process provides a number of key benefits, including low costs, rust resistance and high levels of strength. With all this in mind, let’s take a quick moment to dig into these benefits of roto moulding in greater detail. First up, we’ll start by taking a look at what the roto moulding process involves.

An overview of the rotational moulding process

Put simply, rotational moulding is the process of creating a durable product made of plastic. This is done by ‘cooking’ raw polyethylene powder in a hollow mould that rotates around two axes at a low speed.

During the rotation period, the raw polyethylene material undergoes a period of heating that usually lasts for 45 minutes to an hour. This transforms what was previously a powder into a plastic that sticks to the walls of the tank.

Once a water tank has been formed, it then goes through a period of cooling before it’s removed. The end product is a hollow, virtually seam free water tank with a consistently even wall thickness.

5 benefits of using rotational moulding

Water tanks can be made in a number of ways. However, we believe that rotational moulding creates the best product. This is because rotational moulding provides all the following benefits:

1. Low manufacturing costs

With roto moulding, tooling costs are relatively low when compared to injection and blow moulding. On top of this, manufacturing lead time is also significantly reduced in comparison to other construction methods because the manufacturing process is straightforward.

All of this means that the initial cost of making a water tank using rotational moulding is low. Here at Excelsior, that enables us to pass these savings on to you, the customer.

2. Tanks are rust-resistant and corrosion-free

Although some types of water tank are prone to soil-side erosion, polyethylene cannot and will not ever rust. This provides polyethylene water tanks with a huge advantage over metal and stainless-steel water tanks, which are prone to localised corrosion. This also means that tanks made via rotational moulding will save you money on repairs and replacement costs in the future.

3. Tank strength

Although polyethylene is light, it’s also incredibly durable. Due to the fact the material can flex, its structural integrity can be maintained for longer than concrete and fiberglass tanks. Plus, thanks to its one-piece construction, the tank has no weak points.

4. Design flexibility

Polyethylene is one of the easiest thermoplastics in the world to work with. As a direct result of this, it’s easy to make customised water tanks. No matter what your design needs, we’re confident we can create a bespoke solution that’s perfect.

5. Mobility

Finally, because polyethylene water tanks are lightweight, they’re very easy to transport. This means you can move them and reposition them as you need to. This is a huge advantage over concrete and steel water tanks, which are incredibly difficult to transport.

If you have further questions about rotational moulding or you need specific advice about your situation, then we’re happy to help. Here at Excelsior, we have over 100 years of experience behind, so you can trust our experts to know what they’re talking about when it comes to plastic manufacturing. Just take a look at some of our successful case studies for previous clients, or give us a call on 0161 765 2010 to see what we can do for you!