Newton 403 HydroBond is a high performance, self-healing, composite sheet membrane, available in two variants, with Newton HydroBond-GB adding ground gas resistance as well as the exceptional waterproofing capabilities of the standard membrane. When fitted above the raft support or to wall formwork, the membrane locking fleece is fully encapsulated in to the newly placed concrete, becoming fully-engaged to prevent water tracking. If the waterproof LDPE layer is punctured, the exposed hydrophilic coating expands, preventing water ingress, effectively sealing small holes that may be accidentally formed during fixing of the reinforcing steel or the placing and compaction of the concrete.