Supercast SW30 is a swellable waterstop for in-situ concrete construction joints. It is made from high-performance synthetic elastomer strips and features a high swelling action when in contact with water due to its hydrophilic groups. This expansion creates positive pressure against the concrete joint, preventing water passage. It is designed to integrate with conventional Supercast PVC waterstop networks, allowing for a continuous waterproofing system. It performs effectively in saline ground conditions and can seal gaps up to 2mm when used with Supercast SWX or Supercast SW Adhesive.