Bituminous geomembrane, known as BGM liner, is a specialty geomembrane with composite layers that make it stronger, more watertight and more durable than resin-based geomembranes. Outstanding UV resistance. Its layers consist of an anti-root film with a glass mat providing high tensile strength; a non-woven geotextile that provides mechanical resistance to punctures and tears; and finally, a specially designed elastomeric or blown bituminous binder provides waterproofing and chemical resistance. On the top surface, an applied “sanding” provides greater friction with overlaying soils contributing to better stability. Common uses are mine tailings ponds, wastewater containment, dams.