The geomembrane is made of a plastic film as an impervious substrate and a geotechnical impermeable material made of a non-woven fabric. The anti-seepage performance of the new material geomembrane mainly depends on the impermeability of the plastic film. At present, the plastic film for impervious application at home and abroad mainly includes polyvinyl chloride (PVC), polyethylene (PE), and EVA (ethylene/vinyl acetate copolymer), and there are also ECB (ethylene vinyl acetate) modified in tunnel applications. Asphalt blend geomembrane, they are a kind of polymer chemical flexible material, with small specific gravity, strong extensibility, high adaptability to deformation, corrosion resistance, low temperature resistance and good frost resistance.
Geotechnical membrane (anti-seepage substrate - plastic film) national technical standards:
LDPE
LLDPE
EVA HDPE No.
index
1
Thickness mm
0.2-3.0
0.2-3.0
0.2-4.0
0.2-4.0
2
Width m
2.5-9.0
2.5-9.0
2.5-8.0
2.5-8.0
3
Tensile strength (horizontal and vertical) Mpa
>=14
>=16
>=16
>=17
>=25
4
Elongation at break (vertical and cross)%
>=400
>=700
>=550
>=450
>=550
5
Right angle tear strength N/mm
>=50
>=60
>=60
>=80
>=110
6
Water vapor permeability coefficient g. cm/c?.s. pa
<1.0*10
<1.0*10
<1.0*10
---
---
7
Operating temperature range
+70°C to -70°C
+70°C to -70°C
+70°C to -70°C
---
---
8
Carbon black content%
---
---
---
2.0-3.0
9
Environmental Stress Cracking F
---
---
---
>=1500
10
-70°C low temperature impact embrittlement
---
---
---
Pass pass
11
200°C oxidation induction time
---
---
---
>20