FERROCEL 316 is a round foam backer rod made from a closed-cell polyethylene foam. Its purpose is to create a more efficient and cost-effective seal for concrete joints.

The foam is used as a filler before applying a top sealant like acrylic, polyurethane, polysulfide, or silicone. Made from dense, highly flexible, and lightweight polyethylene, it provides a durable, permanent solution that can withstand the movement of concrete.