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| Tested Property | Test Method | Frequency | Minimum Average Value | |||||
| Thickness, (minimum average) mm | ASTM D 5199 | every roll | 0.75 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 |
| Density, g/cm3 | ASTM D 1505 | every 5th roll | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 |
| Tensile Properties (each direction): | ||||||||
| Strength at Break, N/mm-width | ASTM D 6693, Type IV | every 5th roll | 21 | 28 | 43 | 57 | 71 | 85 |
| Strength at Yield, N/mm-width | 11 | 15 | 23 | 30 | 38 | 45 | ||
| Elongation at Break, % | G.L. 51 mm (2.0 in) | 700 | 700 | 700 | 700 | 700 | 700 | |
| Elongation at Yield, % | G.L. 33 mm (1.3 in) | 13 | 13 | 13 | 13 | 13 | 13 | |
| Tear Resistance, N (lb) | ASTM D 1004 | every 5th roll | 93 (21) | 125 (28) | 187 (42) | 249 (56) | 311 (70) | 373 (84) |
| Puncture Resistance, N (lb) | ASTM D 4833 | every 5th roll | 263(59) | 352(79) | 530(119) | 703(158) | 881(198) | 1,059 (238) |
| Carbon Black Content, % | ASTM D 1603 / D 4218 | every 5th roll | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 |
| Notched Constant Tensile Load, hrs | ASTM D 5397, Appendix |
90,000 kg | 400 | 400 | 400 | 400 | 400 | 400 |
| Oxidative Induction Time, minutes | ASTM D 3895, 200° C; O2, 1 atm |
90,000 kg | >100 | >100 | >100 | >100 | >100 | >100 |
| TYPICAL ROLL DIMENSIONS | ||||||||
| Roll Length, m | 280 | 210 | 140 | 105 | 85 | 70 | ||
| Roll Width, m | 7.0/8.0 | 7.0/8.0 | 7.0/8.0 | 7.0/8.0 | 7.0 | 7.0 | ||
HDPE GEOMEMBRANE WELDING & INSTALLATION
-- The surface must be inspected immediately before the liner is placed. Any debris that could damage the liner or prevent an even/smooth deployment must be removed.
-- The deployment of the rolls should be in a manner that will require the least amount of welding.
-- The rolls are placed as pre-determined in the blueprint or design.
-- If the lining is going over a slope it is laid vertically up and down the slope. Additionally, material that is deployed on a slope should be carefully unrolled and not simply unrolled freely downhill. On slopes that are curved, material may require a diagonal cut in order to ensure welds are perpendicular.
-- The installers will take careful precautions to prevent wrinkling
-- Anchor the linings as they are laid. Usually sandbags or tires are used.
Geomembrane welding machine
1. Hot wedge welder
2. Extrusion welder gun
3. Hot air welder gun
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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