How Are Plastic School Lockers Made? A Guide for Schools
- sales67174
- 3 days ago
- 3 min read
Plastic lockers are becoming an increasingly popular choice for schools looking for a lightweight, low-maintenance, and hard-wearing storage solution. But what exactly goes into making them? Are they recyclable? And are they truly waterproof?
In this post, we break down the two main manufacturing methods—injection moulding and rotational moulding—highlight the key differences between them, and explain what schools need to know before choosing plastic school lockers for their site.
What Are Plastic School Lockers?
Plastic lockers are storage units made from high-density polyethylene (HDPE) or similar durable polymers. They’re designed to be robust, resistant to rust, and ideal for areas where metal lockers might suffer from corrosion—like changing rooms, sports halls, and cloakrooms.
They are particularly well-suited to high-traffic school environments, thanks to their impact resistance and long lifespan.
Two Main Manufacturing Methods
Plastic lockers can be made in two main ways: injection moulding and rotational moulding (roto moulding). Both methods have their strengths, and understanding the differences can help you make the right choice for your school.
1. Injection Moulded Lockers
Injection moulding involves injecting molten plastic into a rigid metal mould under high pressure. Once cooled, the plastic hardens into shape and the mould is opened to release the part.
Key features:
Faster production time – ideal for larger-scale projects
More precise detailing – sharp corners, uniform thickness
Typically lighter in weight
Smoother surface finish
Best for: General use in indoor areas such as classrooms, corridors or staff rooms.
2. Rotational Moulded (Roto-Moulded) Lockers
In rotational moulding, plastic powder is added to a hollow mould, which is then heated and rotated slowly. As the plastic melts, it coats the inside of the mould evenly, forming a seamless, hollow product.
Key features:
Seamless one-piece design – no weak joins or welds
Very durable and impact-resistant
Thicker walls than injection-moulded alternatives
More suited to rough use or changing rooms
Best for: PE areas, swimming pool changing rooms, or any zone where lockers might take a knock.
Are Plastic Lockers Recyclable?
Yes – most plastic lockers are recyclable, particularly those made from HDPE. This makes them a more sustainable long-term option, especially when sourced from responsible manufacturers.
However, because they are built to last for years—even decades—they don’t need replacing as often as other types, helping schools reduce waste and ongoing costs.
If sustainability is important to your school, look for UK-made plastic lockers with recyclable components and eco-conscious manufacturing practices.
Are Plastic School Lockers Waterproof?
This is a common misconception. While plastic lockers are water-resistant, they are not 100% waterproof.
They can handle occasional splashes or humid environments, but if exposed to heavy rain or sitting water, moisture can still get inside the compartments. For that reason, plastic lockers should always be installed under a canopy or cover if placed outdoors.
This will help protect the contents, preserve the structural integrity of the locker, and extend its usable life.
Benefits of Plastic School Lockers
Rust-proof and easy to clean
Ideal for damp environments
Available in a wide range of colours and sizes
Long-lasting with minimal maintenance
Customisable for different school needs
Things to Keep in Mind
Higher upfront cost compared to steel lockers
Not suitable for direct outdoor use without cover
Heavier roto-moulded options may need more installation support
Need Help Choosing the Right Plastic Lockers?
At Lockers for Schools, we offer a wide range of plastic school lockers, including both injection moulded and roto-moulded options, all manufactured to high UK standards. Whether you're upgrading your changing rooms, cloakrooms or corridor storage, we can help you find the right fit for your space, budget, and students.
UK-manufactured plastic lockers
Available in multiple sizes and colours
Antibacterial finishes available
Expert layout and installation advice
Get in touch today for a free quote or explore our full range of lockers for schools to find your perfect solution.
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