Geosynthetic Clay Liner( GCL)is made from 100% natural sodium bentonite, Woven Geotextile, nonwoven Geotextile.Geosynthetic clay liners (GCLs) are high performance needle punched environmental reinforced composites which combine two durable geotextile outer layers with a uniform core of natural sodium bentonite clay to form a hydraulic barrier. Fibers from the non-woven geotextile are needle punched through the layer of bentonite and incorporated into the other geotextile (either a woven or non-woven).when hydrated under a confining load, the bentonite swells to form a low permeability clay layer with the equivalent hydraulic protection of several feet of compacted clay.
Property
Specification
Unit weight: 4500g/m2, 4800g/m2, 5000g/m2, 5500g/m2, 6000g/m2 or customerized
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Fixed aperture lens: fixed focus and fixed aperture, mainly used in places where ambient light is fixed;
Manual iris lens: fixed focus but adjustable aperture, mainly used for fixed ambient light but indefinite place;
·Auto-iris lens (DC-drive): fixed focal length, using a DC voltage to drive a fixed-range location for ambient light variability;
·Auto-iris lens (Video-drive): fixed focal length, using a video signal to drive a fixed-range location for ambient light variability;
Manual iris zoom lens: It is mainly used in indoor environment where the degree of light is variable and the range is not the same;
Auto-aperture zoom lens: It is mainly used in outdoor environment where the ambient light is variable and the range is not the same;
· On-Board Lens (on-Board): mainly with infrared cameras, both indoor and outdoor;
· Fish-eye panoramic lens: It is mainly used in indoor environment where the degree of light is variable and the size of the range is specified;
·Power zoom lens: It can remotely control the focal length and aperture of the focal length. It is mainly used in places where the indoor and outdoor ambient light levels are uncertain and the depth of field range can be adjusted according to requirements.
·Pin-Hole: It is mainly used for hidden monitoring and places where the ambient light is indefinite and has a specific range. 
From the above lens classification, we can see that the difference between various types of lenses is mainly in their use and application environment requirements. Therefore, in practical applications, how to match the lens perfectly is also a big test for the engineering company. 
1. Swell when meet water
2. Long time waterproofing and friendly to environment
3. Separation, reinforcement, protection, filtration and easy for construction
Application
1. Municipal project, subway, underground and roof waterproofing
2. landfill, waste water treatment, industial waste
3. Waterproofing and reinforcement in water conservancy, river, lake and dam
4. Artificial lake, golf course and fish pond
5. Petrifaction and mineral waterproofing
Width: 5m-6m or customerized
Length: 10m, 20m, 30m, 40m, or customerized
Technical data
The Top Ten Classifications of Lens
Due to the importance of the lens, before the monitoring and engineering design planning, only by first understanding the type of lens and its application methods, and understand the characteristics of its application, in order to maximize the lens imaging. According to the current domestic classification methods, shots can be roughly classified into the following ten types.