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Waterproofing Hydrophilic Bentonite Waterstop Bar. Durable Material Composition: Made from synthetic rubber and sodium Bentonite clay for long-lasting waterproofing. Seals Hairline Cracks: Expansive clay mass effectively seals hairline shrinkage cracks in concrete. Versatile Applications: Ideal for foundation walls, slabs, manholes, pipe connections, and utility vaults. Customized Color: Available in Black color to meet specific project requirements. ISO Triple Certified: Certified with ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 for quality and safety. High Production Capacity: Factory produces 10,000 meters per day ensuring fast order fulfillment.