Shandong Longxiang New Materials Co., Ltd.
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Premium HDPE Dimple Sheet | Foundation Wall Waterproofing & Protection Membrane
Classification :
PRODUCT DETAILS
1.What is White Virgin HDPE Dimple Sheet?
The White HDPE Dimple Sheet is a premium protective drainage material manufactured by Longxiang New Materials using 100% virgin high-density polyethylene (HDPE) resin through a high-temperature extrusion and molding process. Unlike traditional black drainage sheets made from recycled materials, this product contains no recycled plastics or inferior fillers, retaining the natural, milky-white, semi-translucent appearance characteristic of high-molecular-weight polyethylene.
Its composition of pure virgin material endows this white drainage sheet with exceptional physical and mechanical strength, superior tear and elongation resistance, and outstanding aging resistance. It is a flagship product specifically engineered for high-standard civil engineering projects and large-scale building foundations that demand strict environmental compliance, withstand harsh construction environments, or require an exceptionally long service life.
2.Why do high-end projects specify white drainage sheets made from virgin material?
When undergoing technical vetting by consultants and engineers, our white virgin-material dimple sheets offer the following core competitive advantages:
- 100% Eco-Friendly & Non-Toxic: Made from virgin material, these sheets contain no heavy metals or harmful volatile compounds. They do not contaminate groundwater even after prolonged exposure to water flow in the soil, making them the preferred choice for underground drinking water reservoirs, green roofs, and ecological landscaping for basements.
- Superior Tensile Strength and Puncture Resistance: Unlike black sheets made from recycled material—which are prone to brittleness and cracking—our white virgin-material drainage sheets possess exceptional toughness. The dimples will not rupture or collapse, even under extreme conditions such as uneven soil settlement or backfill containing sharp rocks.
- Ultra-Long Lifespan (50+ Years): Pure HDPE offers outstanding chemical stability, resisting corrosion from various underground acids, alkalis, and salts, thereby ensuring a service life that matches that of the building structure itself.
- High Visibility for On-site Inspection: The white surface is highly reflective, making it easy to inspect overlap seams and fastener points in dimly lit basements, tunnels, or during night construction. It also facilitates on-site quality acceptance by supervisors (allowing for easy verification of the absence of impurities or air pockets).
3.Technical Specifications
To meet ASTM standards and the entry requirements for high-standard European engineering projects, our white drainage boards undergo rigorous quality inspections before leaving the factory:
|
Properties |
Test Method |
Specification and Parameter Range (Value) |
|
Material Type |
- |
100% Virgin High-Density Polyethylene |
|
Color |
Visual Presentation |
Milky white / Translucent(Milky White / Semi-Translucent) |
|
Dimple Height |
ASTM D5199 |
8 mm / 10 mm / 12 mm / 20 mm |
|
Weight per sqm |
- |
600 g/m² — 1600 g/m² |
|
Compressive Strength |
ASTM D1621 |
200 kPa — 450 kPa (29 psi — 65 psi) |
|
Elongation at Break |
ASTM D638 |
≥ 400% |
|
Low Temp. Flexibility |
ASTM D746 |
No cracks at -30°C |
Customized Engineering Support: Based on your design specifications, we can thermally bond white continuous-filament or staple-fiber non-woven geotextiles—available in various weights (e.g., 100 g/m² to 200 g/m²)—directly onto the surface of white drainage boards during production, creating a finished "White Geocomposite Drain Sheet."
4.Key Applications
This high-performance white drainage and protection membrane is specifically engineered for high-load scenarios requiring superior waterproofing:
- Premium Basement Walls: Installed over external waterproofing coatings, the white drainage board creates a secondary anti-seepage barrier and serves as a robust mechanical protection layer against backfill soil.
- Subway & Railway Tunnels: Acts as a high-performance drainage and diversion layer between the primary support and secondary lining; its superior corrosion resistance—derived from virgin-grade materials—withstands groundwater pressure from surrounding rock for decades.
- Intensive Roof Gardens: Its impermeable, root-resistant, and eco-friendly properties effectively prevent root damage to the waterproofing system while providing a cavity for water retention and drainage.
- Utility Tunnels & Sponge Cities: Delivers a long-lasting, sustainable system for subsurface drainage, diversion, and filtration.
5.Direct Manufacturer Supply & Global Export Assurance (Longxiang New Materials Assurance)
As the premium export division of Shandong Longxiang New Materials Co., Ltd., we fully understand the rigorous requirements regarding delivery schedules and packaging for overseas projects:
- 100% Virgin Material Guarantee: We welcome third-party laboratory testing (e.g., SGS, Intertek) to verify material purity and mechanical properties.
- Standardized Export Packaging: All white drainage board rolls are wrapped in thick, white UV-protective film and secured with high-strength strapping and woven bags, ensuring they remain free from stains and abrasion after months of ocean freight and cross-border transit.
- One-Stop Technical Support: With extensive experience serving major infrastructure projects in the Middle East, North America, and Southeast Asia, we provide comprehensive overseas trade support—ranging from specification selection and container loading optimization to the provision of customs clearance documentation (CO, Form E, etc.).
Drainage Board / Dimple Sheet FAQs
1) What is a drainage board (dimple sheet)?
Drainage boards (dimpled drainage boards) are manufactured from high-density polyethylene (HDPE) through a stamping process. Their surfaces feature a regularly arranged pattern of dimples, which effectively isolate the soil and create a permanent, continuous drainage space, thereby providing exceptional waterproofing, anti-seepage, and water-conducting capabilities.
2) Where is dimple sheet used in construction?
It is widely applied in the landscaping of basement roof slabs, waterproofing of basement exterior walls, roof gardens, the base slabs of road and railway tunnels, and various retaining wall drainage projects; it effectively alleviates water pressure and protects the main building structure from groundwater erosion.
3) What thickness and compressive strength should I choose?
Product selection should be determined based on the project's depth and load requirements. For standard basement walls, products with a stud height of 10–20 mm are typically used. However, if the backfill is particularly deep or the roof slab is subject to heavy loads (such as those imposed by landscaping or planting), it is recommended to select drainage boards made from virgin material—characterized by high gram weight and high compressive strength—to prevent deformation.
4) Does drainage board replace a drainage composite?
Dimpled drainage boards typically require pairing with geotextiles to achieve optimal filtration and drainage results. In contrast, composite drainage materials—such as drainage boards laminated with geotextiles—constitute integrated products. In specific light-load applications or spaces dedicated solely to water conveyance, drainage boards may be utilized as a standalone alternative.
5) How do you install dimple sheet on basement walls?
Wall installation must proceed from the bottom up, with the dimples facing the wall surface. Secure the material using specialized insulation anchors or shot-fired fasteners fitted with washers. Overlapping sections should be sealed using double-sided tape or heat welding, and the top edge must be secured and sealed with a finishing strip to prevent silt and debris from entering the drainage channels.
6) What is the difference between HDPE dimple sheet and other plastics?
Compared to ordinary plastics, high-quality, brand-new HDPE material exhibits superior chemical stability, excellent resistance to acid and alkali corrosion, high tensile and compressive strength, and strong puncture resistance. It is highly resistant to aging and degradation in harsh, damp underground environments, ensuring an engineering service life of over fifty years.
Main Products
PROJECT CASES
APPLICATION AREAS
Geotechnical material series are widely used in various fields such as highways, railways, tunnels, water conservancy of reservoirs and canals, artificial lakes, environmental protection, sewage treatment, landfills, anti-seepage of tailings reservoir areas, and livestock breeding.
Water conservancy projects
Geosynthetics play a vital role in water conservancy projects such as dams and reservoirs, canals and channels, and riverbank protection.
Breeding industry
In the aquaculture industry, geosynthetics such as geomembranes and geotextiles can be used to create healthy aquaculture ponds, ensure stable water quality and reduce water resource consumption. All geosynthetics provided by can be customized according to customer needs.
Road construction
The geosynthetics such as geomembranes, geotextiles, geogrids, geocells, etc. provided by play an irreplaceable role from roadbed treatment to pavement protection, from drainage systems to environmental protection isolation.
Agricultural
In agricultural irrigation and biogas digester scenarios, geosynthetics such as geomembranes and geotextiles play a key role due to their respective characteristics. The products provided by Factory meet the standards and can be customized according to requirements.
Coastal Engineering
In coastal engineering, geosynthetics such as geobags, cement blankets, and geogrids play an important role in coastal engineering from coastal protection, structural reinforcement to slope stability, and effectively respond to the challenges brought by the complex geology and environment of coastal areas.
Environmental Protection
Factory provides customers with high-standard geosynthetics to meet their needs for building landfills.
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