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Chapter 1: Introduction to HDPE Geomembranes
HDPE geomembranes are high-density polyethylene sheets with strong impermeability. They are widely used in infrastructure and environmental protection projects, playing a key role in preventing liquid leakage and soil erosion.
Adaptable to various climates and terrains, these geomembranes have become a crucial material for African countries to address water scarcity and environmental challenges in recent years.
Chapter 2: Physical Properties of HDPE Geomembranes
| Physical Property | Specification |
| Thickness Range | 0.5mm - 3.0mm |
| Tensile Strength | ≥20MPa (at 23℃) |
| Elongation at Break | ≥400% (at 23℃) |
| Tear Strength | ≥50N/mm |
| Impact Resistance | Passes -40℃ low-temperature impact test |
| Permeability Coefficient | ≤1×10⁻¹³cm/s |
| Density | 0.940g/cm³ - 0.965g/cm³ |
| UV Resistance | Retains ≥80% strength after 168h UV irradiation |
| Flexibility | No cracking at -20℃ bending test |
| Heat Resistance | Stable performance at -60℃ - 80℃ |
Chapter 3: Chemical Properties of HDPE Geomembranes
Chemical Property | Performance |
| Acid Resistance | Stable in 10% HCl solution (23℃, 30d) |
| Alkali Resistance | No degradation in 10% NaOH solution (23℃, 30d) |
| Salt Resistance | Unaffected by 30% NaCl solution (23℃, 30d) |
| Oil Resistance | Low swelling rate in mineral oil (≤5% weight gain) |
| Oxidation Resistance | Resists oxidation in air (23℃, 5 years) |
| Chemical Inertness | No reaction with common soil chemicals |
| Solvent Resistance | Insoluble in ethanol, acetone, and other polar solvents |
| Corrosion Resistance | No corrosion in industrial wastewater (pH 4-10) |
| Hydrolysis Resistance | No hydrolysis in water (23℃, long-term) |
| Biological Resistance | Resists microbial degradation in soil |
Chapter 4: Application Cases in African Countries
1.South Africa Mining Tailings Project: Lined 50,000㎡ of tailings ponds with HDPE geomembranes, preventing heavy metal leakage and protecting groundwater, ensuring compliance with local environmental laws.
2.Nigeria Water Reservoir Project: Used 30,000㎡ HDPE geomembranes to line reservoirs in arid regions, reducing water seepage by 90% and alleviating local water shortage.
3.Kenya Landfill Anti-seepage Project: Applied 25,000㎡ geomembranes in Nairobi landfills, isolating waste leachate and avoiding soil and water pollution.
4.Ethiopia Dam Project: Installed 40,000㎡ HDPE geomembranes in small dams, enhancing dam impermeability and ensuring stable water storage for agricultural irrigation.
5.Ghana Aquaculture Pond Project: Lined 15,000㎡ fish ponds with geomembranes, maintaining water quality and increasing aquaculture output by 30%.
6.Morocco Agricultural Irrigation Project: Used 20,000㎡ geomembranes in irrigation canals, reducing water loss and improvingirrigation efficiency in arid areas.
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Chapter 5: Factors Influencing HDPE Geomembrane Prices
1.Raw Material Cost: HDPE resin price fluctuations directly affect geomembrane costs, with global oil prices impacting resin prices.
2.Thickness & Specification: Thicker geomembranes (e.g., 2.0mm vs 1.0mm) cost 50%-80% more due to more raw materials.
3.Production Scale: Large orders (≥10,000㎡) have 10%-15% lower unit prices than small orders (≤1,000㎡) due to economies of scale.
4.Transportation Cost: Shipping to remote African regions adds 20%-30% to total cost, while coastal countries have lower transport fees.
5.Quality Standards: Geomembranes meeting international standards (e.g., ASTM) cost 15%-25% more than those meeting only local standards.
6.Market Demand: High demand in dry seasons (for water projects) raises prices by 5%-10% compared to off-seasons.
Chapter 6: Advantages of Haoyang Environment in African Geomembrane Market
1.Localized Production: Has factories in South Africa and Nigeria, reducing transportation costs by 20%-30% and ensuring fast delivery (3-7 days).
2.Climate-Adapted Products: Develops UV-resistant geomembranes for African sun, with service life extended to 50 years (10 years longer than ordinary products).
3.One-Stop Service: Provides design, installation, and after-sales support, solving 90% of on-site problems for customers.
4.Compliance with Local Standards: All products meet African environmental and safety standards (e.g., SANS in South Africa), ensuring smooth project approval.
Chapter 7: Shortcomings and Future Outlook of HDPE Geomembranes
Shortcomings: High installation requirements (needs professional teams, increasing 10%-15% of project cost); poor resistance to sharp objects (easily punctured by rocks, requiring additional protection).
Future Outlook: Will develop thinner (0.3mm) but stronger geomembranes to cut costs; integrate nanomaterials to enhance puncture resistance, expanding application in more African infrastructure projects.
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