When it comes to building strong, long-lasting water tanks that also keep water cool, one small decision makes a big difference—insulation. Without proper insulation, water tanks heat up quickly in the sun and lose their coolness faster indoors. This can lead to discomfort for users and even affect water quality.
At Brilsol, we’ve been working with manufacturers to create better, stronger tanks. One thing we’ve found again and again is that PE foam—especially when made with the right rotofoam masterbatch—is one of the smartest materials for tank insulation. It’s reliable, easy to mould, and does the job without adding too much weight or complexity.
Let’s walk you through why PE foam matters and how it can improve your water tank product range.
What Is PE Foam?
PE foam, short for polyethylene foam, is a soft, flexible, and closed-cell material. It’s made by mixing polyethylene with a blowing agent that creates air bubbles within the material. These bubbles make the foam light and provide great insulation.
You’ll often find PE foam in packaging, cushioning, insulation, and—most importantly—foam for tanks.
But not all PE foam is the same. When produced using high-quality rotofoam masterbatch, the result is a consistent, even, and long-lasting foam layer that’s perfect for foam for water tanks.
Why Does a Water Tank Need Insulation?
Water tanks are often kept outdoors or on terraces where they’re exposed to direct sunlight. Even indoor tanks can heat up during the day due to nearby heat sources.
Without insulation, these tanks:
- Heat up quickly
- Fail to keep water cool for long
- Cause discomfort during showers or washing
- May lead to bacterial growth in warm water
A foam-insulated tank, on the other hand, helps maintain the water temperature for longer hours. The inside of the tank stays cooler even in hot weather, reducing the chance of heat-related water issues.
How PE Foam Supports Tank Performance
Let’s look at why PE foam is one of the most effective materials used for insulating water tanks.
1. Thermal Insulation
PE foam has low thermal conductivity. This means heat from outside takes longer to enter the tank. When applied between layers of the tank body, it acts as a thermal barrier.
2. Lightweight
Foam for tanks must not add too much weight to the structure. PE foam is very light but still firm, which makes it perfect for rotomoulded tanks.
3. Water Resistance
PE foam is closed-cell, which means it doesn’t absorb water easily. That helps prevent swelling, odour, and bacterial issues inside the tank walls.
4. Shock Absorption
It also adds a small amount of shock resistance, helping reduce the chance of cracks if the tank is bumped during installation or transport.
5. Noise Reduction
An added bonus—PE foam also helps reduce noise inside the tank when water flows in or out. It absorbs small vibrations and sound.
What Is Rotofoam Masterbatch?
To produce foam for water tanks using rotational moulding, manufacturers need a special additive called rotofoam masterbatch. This compound is added to polyethylene during the moulding process to create the foam layer between tank walls.
Brilsol’s rotofoam masterbatch is made with quality ingredients that help:
- Form uniform foam layers
- Keep cell size consistent
- Prevent thermal bridging
- Stick to inner and outer tank walls smoothly
This masterbatch works well in the rotomoulding process and delivers clean results without affecting tank structure or appearance.
Brilsol’s Role in the Industry
At Brilsol, we’ve been working closely with water tank manufacturers to supply them with the right support for foam-based products. Our rotofoam masterbatch is trusted by clients because it’s:
- Easy to process
- Free-flowing
- Compatible with most base polymers
- Quality-checked before dispatch
We know that making foam for tanks isn’t just about blowing agents—it’s also about experience. That’s why Brilsol focuses on helping customers get the right balance of performance and ease.
Where PE Foam Makes a Difference
Brilsol’s PE foam solutions are used in many applications, especially when a layer of insulation is needed without complicating the moulding process.
Some of the most common use cases include:
Water Storage Tanks
To keep household and industrial water cooler for longer periods.
Chemical Tanks
To prevent extreme heat from affecting the storage quality of certain chemicals.
Transport Tanks
For insulated transport of liquids like milk, water, or sensitive chemicals.
How Insulated Tanks Are Made
Here’s a simple overview of how Brilsol-based foam tanks are produced:
- Outer Layer
Polyethylene is moulded to create the tank’s outer wall. - Middle Foam Layer
PE mixed with rotofoam masterbatch is added and moulded. This creates the insulating foam layer. - Inner Layer
Finally, another layer of polyethylene is added to complete the tank’s inner wall.
This process gives a triple-layered tank with good strength, better thermal resistance, and smooth finishing.
Benefits for Tank Manufacturers
When manufacturers use Brilsol’s rotofoam masterbatch and PE foam solutions, they get more than just insulation.
They also gain:
- Improved product quality – fewer returns due to heating complaints
- Stronger product branding – insulated tanks stand out in the market
- Lower material waste – because our product performs well during moulding
- Consistent output – every tank comes out with a uniform foam layer
Benefits for End Users
Tank users notice the difference almost immediately:
- Cooler water, even during peak summers
- Better hygiene due to less bacterial growth
- Fewer heat-related cracks or discolouration on tank surfaces
- More comfort during everyday use
Brilsol’s Promise
We believe in keeping things simple and effective. Every batch of rotofoam masterbatch is tested for stability, consistency, and purity before it reaches you.
If you’re a manufacturer looking for reliable foam for tanks, Brilsol is ready to support your process with:
- Technical advice
- Product training
- Bulk supply options
- Quick dispatch and support
Insulated tanks are no longer a luxury—they are a basic need in today’s hot climate. Using PE foam made with Brilsol’s rotofoam masterbatch helps manufacturers offer better products that last longer and keep customers happy.
If you want to add more value to your water tanks or improve insulation without adding complications, Brilsol is ready to be your partner in growth.
Let’s build better tanks together—cooler, stronger, and smarter.