Foam is usually divided into two categories: open and closed cell. A variety of materials can be described as closed-cell. These materials have a range of densities and each material can vary. A key advantage of closed-cell foams is their strength.

What does closed-cell mean?

Closed-cell sponge rubber and foam contains balloon-like cells that hold nitrogen gas and so prevent the passage air, water, and other chemicals when the material is not compressed. Nitrogen gas, when released in process, give closed-cell sponge rubber its strong compression set and recovery characteristics.

Examples of closed-cell sponge rubbers and foams

Neoprene foam

Neoprene foam is an extremely durable sponge rubber that can withstand a variety of environmental and situational factors. Exposure to the ozone, sunlight and oxidation does not negatively impact this strong material. A common application accross the world for this material is wetsuits and other scuba diving equipment.

Polyethylene foam

Similarly, Alanto's polyethylene is an extremely resilient material that does not easily break when in contact with water and air. In other applications across the world, it is commonly utilised in purposes such as marine applications, footwear and packaging as it is excellent in adverse conditions.


EPDM is supplied in a closed-cell form. This closed-cell material requires minimal compression to provide a seal and is excellent in preventing the entry of air and moisture. In addition, closed-cell EPDM is a robust and durable material.

Alanto supply a broad selection of materials - click here to discover more today.