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The raw materials used for composite geomembrane should not only take into account the physical and chemical performance indicators specified in the use environment, but also pay special attention to the production cost. In terms of performance indicators, the following aspects are mainly considered:

1. Lightweight: Polypropylene resin is used as the main raw material for production, with a specific gravity of only 0.9, which is only three-fifths of cotton. It is fluffy and feels good. 2. Soft: It is composed of fine fibers (2-3D) and is formed by light-point hot-melt bonding. The finished product is moderately soft and comfortable. Polypropylene non-woven fabric Polypropylene non-woven fabric

The purpose of geomembrane is to use its anti-permeability effect. Geomembrane should be impermeable to the molecular structure and manufacturing process. However, due to the unevenness and defects in manufacturing, the commonly used geomembrane must not leak. It's just that it is relatively difficult to permeate and what is more important is whether the geomembrane can maintain its anti-seepage performance under the action of long-term water head when it contacts the actual soil (or other materials). Due to the uneven contact surface, rough soil particles, large local deformation of the soil, etc., the geomembrane may be broken or torn under the action of high water head, and its anti-seepage performance will be lost or weakened. Therefore, corresponding anti-seepage tests are also required.

Geomembrane is a flexible anti-seepage geosynthetic material, and the stability of the support layer below it is one of the keys to the safety of the anti-seepage geomembrane.

The characteristics of composite geomembrane materials should consider the design requirements, usually the thickness is not less than 0.2 mm, the total weight per square meter and various characteristics should be selected according to the design requirements, and the width should be selected according to the width of the channel laying.

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