Expansion joint foam is a closed-cell polyethylene foam, which is used in construction to fill gaps between materials like concrete or brickwork, preventing cracks by accommodating movement. It functions as a joint filler, former, or stop-end and is resistant to weather, chemicals, and water. This foam is available in various forms, such as strips and rolls, Usually 6m and 25m is the standard roll length. and is often customized to specific needs.