Geomembranes represent the second largest group of geosynthetics, and in dollar volume their sales are essentially equal to that of geotextiles. They are impervious thin sheets of rubber or plastic material used primarily for linings and covers of liquid- or solid-storage facilities. Thus, their primary function always is as a liquid or vapor barrier. The range of applications, however, is very wide. Geotextiles form the largest group of geosynthetics. They are indeed textiles in the traditional sense, but consist of synthetic fibers rather than natural ones, such as cotton, wool or silk. Geotextiles are porous to water flow across their manufactured plane and also within their plane, but to a widely varying degree.
Overall, the primary difference between geotextiles and geomembranes is that geotextiles are used for filtration and soil stabilization, while geomembranes are used for waterproofing and the containment of liquids or gases. Both materials are essential components in the construction of industrial structures, and their specific properties and applications will depend on the specific needs of each project.
