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Foam cutting is the specialised process of slicing foam into specific shapes and sizes. It can be done by hand or with machinery, depending on the complexity of the design and the volume of foam to be cut.
Foam is a versatile material used in everything from packaging and insulation to furniture and toys. Its light weight, insulating properties and ability to be shaped into almost any form make it popular across many industries. This guide covers the main types of foam, the most common cutting techniques and machines, and how cut foam products are used.
| Method | How It Works | Best For | Limitations |
|---|---|---|---|
| Hot wire cutting | A heated wire melts through the foam | Polystyrene foam and intricate shapes, with a smooth, clean edge | Higher temperatures cut faster but melt more foam, giving a wider kerf |
| Band knife cutting | A long, flexible blade moves in a continuous loop and slices through the foam | Cutting large blocks into smaller pieces, and thick, dense foam for upholstery and mattresses | Less suited to intricate shapes than hot wire cutting |
Foam is a broad term covering a variety of materials with different properties. The most common types are polyurethane foam, memory foam and polystyrene foam, each with its own characteristics and uses.
Flexible polyurethane foam is an open-cell foam often used in furniture, bedding and packaging. It is known for its durability and comfort, making it a popular choice for mattresses and upholstery. Memory foam is a type of polyurethane foam modified with additional chemicals that make it viscoelastic, so it moulds to the shape of whatever presses on it, providing excellent support and comfort.
Polyurethane foam is a versatile material found in a wide range of products. It is made by reacting polyols with diisocyanates, both usually derived from crude oil. The reaction creates a foam that is flexible and resilient, making it ideal for furniture and bedding.
The properties of polyurethane foam can be adjusted by changing its formulation, including the balance of polyols and diisocyanates, to produce anything from a soft, flexible foam to a firm, rigid one. This versatility makes it popular in a variety of industries.
Memory foam, also known as viscoelastic foam, is a type of polyurethane foam modified with additional chemicals to change its density and viscosity. This allows it to mould to the shape of an object, providing excellent support and comfort.
Memory foam was originally developed through NASA-funded research in the 1960s to improve the crash protection of aircraft seat cushions. Today it is widely used in mattresses, pillows and other bedding, as well as in medical equipment and seating, because it distributes weight evenly and reduces pressure points.
There are several techniques for cutting foam, each with its own advantages and disadvantages. The most common are hot wire cutting, band knife cutting and water jet cutting. The right method depends on the type of foam, the shape and size required, and the volume of foam to be processed.
Hot wire cutting is a popular method, particularly for polystyrene foam. A wire heated to a high temperature melts through the foam, cutting it with ease and leaving a smooth, clean edge with minimal waste.
The temperature of the wire can be adjusted to control the speed and precision of the cut. A higher temperature gives a faster cut but melts more foam, resulting in a wider kerf (the width of material removed). A lower temperature gives a slower, more precise cut, but more force is needed to push the wire through the foam.
Band knife cutting uses a long, flexible blade that moves in a continuous loop, slicing the foam into the desired shape and size.
It is often used to cut large foam blocks into smaller pieces, and is common in the upholstery industry for cutting foam for furniture and mattresses. Its main advantage is that it cuts through thick, dense foam with ease.
Foam can be cut by hand with a variety of tools, but in industrial settings foam cutting machines are often used to improve efficiency and precision, cutting foam to specific shapes and sizes with a high degree of accuracy.
The main types are hot wire cutters, band knife cutters and water jet cutters. Each has its own advantages and disadvantages, and the right choice depends on the requirements of the job.
Hot wire foam cutters use a heated wire made of a material that withstands high temperatures, such as nickel-chromium or stainless steel. The temperature of the wire can be adjusted to control the speed and precision of the cut.
They are often used to cut polystyrene foam, as the heat melts the foam and leaves a smooth, clean edge. Because the wire can be moved in any direction, hot wire cutters are ideal for intricate shapes and designs.
Band knife foam cutters use a long, flexible blade that moves in a continuous loop. They are often used to cut large blocks of foam into smaller pieces, such as foam sheets, and to cut foam for upholstery and mattresses.
Their main advantage is the ability to cut thick, dense foam with ease. However, they are less suited than hot wire cutters to intricate shapes and designs.
Foam products are used across many industries: furniture (upholstery and mattresses), packaging (protective packaging), construction (insulation), automotive (seats and headrests) and medical (mattresses and cushions). See our guide to foam applications.
This versatility comes from foam’s light weight, insulating properties and ability to be shaped into almost any form, which make it suitable for everything from everyday household items to specialised industrial equipment.
Foam is widely used in the furniture and bedding industry, in the upholstery of sofas and chairs and in mattresses and pillows, where it provides comfort and support. Memory foam is a popular choice for mattresses and pillows because it distributes weight evenly and reduces pressure points, while polyurethane foam is common in furniture and bedding for its durability and comfort. See our guide to custom cushions.
Foam protects fragile items during shipping by absorbing shock and preventing damage, and it fills voids in boxes and containers so items do not move around in transit.
Polystyrene foam is a popular choice for packaging because it is lightweight and rigid, making it ideal for protecting delicate items. It is also easy to cut and shape, so it can be customised to fit almost any item.
Foam is a versatile material with a wide range of applications. Understanding the different types of foam and how it is cut helps you choose the right material and method, whether you work in the foam industry, are a hobbyist exploring what foam can do or are simply planning a project.
Continue exploring how foam is made, shaped and used across our glossary:
For replacement cushions, seat pads, mattresses and custom inserts, the Foam & Covers team can cut foam precisely to your shapes and measurements.
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