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HDPE Geomembrane is a kind of waterproof barrier material based on polymer, It is made from high-grade polyethylene by triple layer coextrusion & film-blowing technology or double layer pressing and rolling technology
HDPE Geomembrane
HDPE Geomembrane is made from High Density Polyethylene raw material, adding color masterbatch, antioxidant, anti aging and UV resistance component,anti aging agent, antioxidant, ultraviolet absorbent, stabilizer s accessories, etc. What' s more, its anti seepage and isolation performance are strong. Suitable for pools, canals, embankments, landfill, tunnel and many other places.It adopted the first class automatic production equipment and blowing technology. All products are in accordance with GRI GM13 and ASTM Standard.
| Tested Item | Test Method | Frequency | Minimum Average Value | ||||||
| RH0.50 mm |
RH0.75 mm |
RH1.00 mm |
RH1.50 mm |
RH2.00 mm |
|||||
| Thickness, (minimum average), mm Lowest individual reading | ASTM D 5199 | every roll | 0.50 0.425 | 0.750 0.675 | 1.00 0.90 | 1.50 1.35 | 2.00 1.80 | ||
| Density, g/cm3 | ASTM D 1505 | 90,000 kg | 0.940 | 0.940 | 0.940 | 0.940 | 0.940 | ||
| Tensile Strength at Break, N/mm Strength at Yield, N/mm Elongation at Break, % Elongation at Yield, % |
ASTM D 669 |
9,000 kg | 13 7 700 12 |
20 11 700 12 |
27 15 700 12 |
40 22 700 12 |
53 29 700 12 |
||
| Tear Resistance, N | ASTM D 1004 | 20,000 kg | 60 | 93 | 125 | 187 | 249 | ||
| Puncture Resistance, N | ASTM D 4833 | 20,000 kg | 160 | 240 | 320 | 480 | 640 | ||
| Carbon Black Content, % (Range) | ASTM D 603*/4218 | 9,000 kg | 2.0 - 3.0 | ||||||
| Carbon Black Dispersion | ASTM D 5596 | 20,000 kg | Note(1) | Note(1) | Note(1) | Note(1) | Note(1) | ||
| Notch Constant Tensile Load, hr | ASTM D 5397, | 90,000 kg | 300 | 300 | 300 | 300 | 300 | ||
| Oxidative Induction Time, min | ASTM D 3895, | 90,000 kg | >100 | >100 | >100 | >100 | >100 | ||
Geomembrane welding machine
1. Hot wedge welder
2. Extrusion welder gun
3. Hot air welder gun
GEOMEMBRANE WELDING
Geomembrane lining systems require welding that should performed by qualified technicians.There are two primary welds that are commonly utilized in geomembrane installation:
Double hot wedge welding is the preferred method and the most reliable.
-- The surface area that will be welded should be free of debris or any foreign materials.
-- If extrusion welding is used, oxidation must be removed by grinding and debris from grinding must be removed.
-- Double welds are used frequently in order to create a channel of air between welds that facilitates testing.
-- Trial welds are made on a regular basis.
Tai'an City RuiHeng Building Materials Co., Ltd is specialized in the research, development, production and sales of geosynthetic materials, plastic products and plastic machinery. Our company is devoted to geosynthetic material research and development and application.
1.Textured or Smooth hdpe Geomembrane?
A textured product is either needed or is not. This apparent truism needs to be remembered in many cases in which a product is specified for a project which clearly does not qualify to be designated as textured yet is designated as such, creating a huge confusion about the uncertainty of the client's needs.
If the client does not clarify they require, it is hardly feasible to offer the right solution in conditions comparable to any concurrent company.
2.Is a hdpe Geomembrane with a wider roll better?
There is a technical limit for manufacturing geomembranes. In high density polyethylene (HDPE), this is 7.5 to 8m. Beyond this limit, either the raw material is not an HDPE and is instead a softer material which enables the extrusion-header system of the machine to complete the geomembrane transformation cycle, or the uniform thickness or thermal treatment parameters of the raw material have been seriously compromised. Within these limits and exceeding a minimum width, under which it would be unreasonable to present a product for the Safe Containment application, the roll width is the choice of the manufacturer, usually subject to the presentation format and transport cost optimisation.
There is hardly any difference between the cost of machines for given widths.
Within these limits, it is true that a wider roll relieves installation costs in large projects by a small percentage; however it is always at the expense of a higher cost of handling bulk unit weight of the roll or overruns in the finishing of curves or corners.
3.Differences between LLDPE and HDPE geomembrane?
Linear low density polyethylene (LLDPE) and high density polyethylene (HDPE) are raw materials which are similar in terms of composition, but very different in their behaviour, as has already been discussed in previous sections.
HDPE has become a global standard for Safe Containment applications precisely for its unique properties and marketing an LLDPE as an HDPE in these applications is tantamount to offering a substitute product without any benefit to the client. Differentiating them is very simple.
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