Rubber waterstops and rubber sealing strips are mainly made of natural rubber and various synthetic rubbers, mixed with various additives and fillers, and processed through plasticizing, mixing, and pressing molding. They come in various specifications and can be classified according to usage as: medium-buried rubber waterstops, back-pasted rubber waterstops (external-pasted rubber waterstops), steel-edged rubber waterstops, water-swelling rubber waterstops, and flat rubber waterstops. Commonly used materials include natural rubber waterstops, neoprene rubber waterstops, and EPDM rubber waterstops.