Closed-cell foams are commonly known as:

polyethylene foam (PE foam), polypropylene foam, polystyrene foam (including EPS and XPS), polyurethane foam, neoprene foam, and EVA foam. These foams are characterized by a closed-cell structure that prevents water and air from penetrating.

Polyethylene foam is a versatile product that is suitable for many applications. It is probably the most widely used foam. It is used as buoyancy aids, for packaging, cushioning, or sound insulation, as well as in the production of many other everyday products.

Polyethylene foam is chemically composed of closed cells, meaning that it is made up of tiny, separate bubbles. This arrangement makes it waterproof and is therefore often used in buoyancy products. It is highly resistant to chemicals such as solvents and petroleum derivatives.

Depending on its density, polyethylene foam is a flexible material and can recover its shape under pressure, while providing cushioning and safety. These properties and its adaptability make it suitable for a wide range of applications. The closed-cell structure of foam also makes it resistant to moisture, making it an important thermal insulation material.

During foam production, polymer compounds are heated and additives are added to change the desired properties. For example, antistatic foams can be produced for handling, packaging, and distributing delicate electronics. These items require antistatic packaging to dissipate electrical charges that can build up and damage components. In other cases, where the foam must be corrosion-resistant, VCI inhibitors are added.

Closed-cell polyethylene is versatile and can be produced in a variety of shapes and sizes. During production, it can take the form of a cylinder, sheet, or other profile.