There are several different types of materials that waterproofing equipment is made of. A few examples of materials used in waterproofing are asphalt-based painted substances and bentonite or clay based products. Bentonite is formed from the weathering of volcanic ash, and is preferable because of its ability to absorb several times its own dry weight in water. Bentonite also seals when wet, making it a great sealant material. Asphalt is carefully refined from the distillation of selected crude oils and is used because of its impermeability and reliability. Mar-flex offers several types of waterproofing products, made from different materials, so check out our selection.