Frequently Asked
Questions

A geocell (cellular confinement system, CCS) is a three-dimensional honeycomb-like matrix made from strips of high-density polyethylene (HDPE) or Novel Polymeric Alloy (NPA) welded together ultrasonically. When expanded on-site and filled with sand, soil, gravel, or concrete, it creates a rigid yet flexible reinforcement structure that dramatically improves the mechanical properties of native soil or fill.

SYLVAGEO geocells are manufactured from two primary materials:

• HDPE (High-Density Polyethylene): Polymer density 0.935–0.965 g/cm³, with carbon black content of 1.5–2.0% for UV stabilization. Stress crack resistance exceeds 6,000 hours (ASTM D1693).
• NPA (Novel Polymeric Alloy): An advanced compound with enhanced anti-creep, anti-oxidation, and low thermal expansion properties, developed for longer service life and better performance under cyclic loading.

Both materials are available in PP (polypropylene) variants for specific temperature resistance requirements.

SYLVAGEO geocells are designed for a 50-year service life. Key longevity factors include:

• Carbon black content (1.5–2.0%) provides UV resistance even when portions are exposed
• Oxidation induction time ≥ 20 minutes (ASTM standard)
• Embrittlement temperature as low as –50°C for HDPE grades
• Anti-stress cracking rated at >400 hours (ASTM D5397) and >6,000 hours (ASTM D1693)

Field installations from 2013 continue to perform without maintenance as of this writing.

Geocells accept a wide range of locally sourced fill materials, which significantly reduces project cost:

• Slope / erosion control: Native soil, topsoil with seed mix
• Channel protection: Gravel, crushed stone, concrete
• Load support / roads: Compacted gravel or crushed stone (compaction ≥ 0.9)
• Retaining walls: Compacted granular backfill

Using local fill materials typically saves 50% on aggregate costs compared to importing specified fill.

Standard cell depths: 75 mm, 100 mm, 150 mm, 200 mm

Standard expanded cell sizes (width × length):

• 320 × 287 mm
• 475 × 508 mm
• Custom dimensions available on request

Standard expanded panel sizes:

• 2.56 × 8.35 m
• 4.5 × 5.0 m
• 6.5 × 4.5 m
• 6.1 × 2.44 m

Sheet thickness: 1.27 mm nominal (before texturing), 1.52 mm after texturing.

SYLVAGEO geocells are manufactured and tested to the following standards:

Seam peel strength measures the force required to separate two ultrasonically welded strips. It is the most critical quality indicator for geocells — weak seams mean the system can open under load.

SYLVAGEO seam peel strength by cell depth:

• 75 mm depth: 1,065 N
• 100 mm depth: 1,420 N
• 150 mm depth: 2,130 N
• 200 mm depth: 2,840 N

Seam efficiency is rated at 100% per GRI-GS13, meaning the seam is as strong as the parent material.

Geocell installation does not require professional training or specialized equipment. Typical installation steps:

1. Prepare and level the subgrade
2. Lay geotextile base layer (if specified)
3. Unfold and pin the geocell panel to design dimensions
4. Anchor edges with anchor pins or stiffened belt
5. Fill cells with specified material
6. Compact fill (standard plate compactor)

Installation efficiency: 50–100 m² per person per day, compared to 2–5 m²/person·day for masonry. Construction is possible year-round in most climates.

A standard geocell installation system includes:

• Geocell panels — the primary structural element
• Stiffened belt — perimeter reinforcement strip for panel edges
• Anchor pins / Ground anchors — secure panels to the subgrade
• Non-woven geotextile — underlayer to prevent subgrade migration into fill
• Locking caps — connect adjacent panels at the top
• Connecting anchors — panel-to-panel connections

SYLVAGEO supplies a complete component package. Contact us for a bill of materials based on your project drawings.

Yes. SYLVAGEO geocells have been installed successfully in submerged riverbed conditions. Key considerations:

• HDPE and NPA materials are fully water-resistant with no degradation
• Underwater installation typically uses ballast stones to hold panels in position before filling
• Geotextile base layer is critical for sub-water installations to prevent sediment piping
• Concrete or heavy gravel fill is preferred for permanently submerged sections

Reference: Songhua River silt riverbed reinforcement project (2013), where geocell panels were installed directly on soft silt substrate beneath the water level.

SYLVAGEO geocells are perforated across 98% of their surface area. This means:

• Rainfall percolates through the geocell into the fill and subgrade, preventing hydrostatic pressure buildup
• Plant roots can penetrate through the cell walls, anchoring into native soil below
• Moisture is retained more effectively than on impermeable surfaces — supporting plant establishment even in dry conditions
• After 1–2 growing seasons, vegetation root systems combine with the geocell matrix for a self-reinforcing bioengineering system

Cold performance: HDPE grades maintain flexibility at –50°C (embrittlement temperature). This makes geocells far superior to concrete structures in freeze-thaw cycling environments. The farm canal project demonstrated that geocell channels survived the first winter intact, while an adjacent masonry channel experienced complete frost-heave collapse.

Heat performance: NPA material features a low thermal expansion coefficient, minimizing dimensional changes in high-temperature climates. Standard HDPE has a Vicat softening temperature of ≥ 112°C; PP grades exceed 142°C.

UV exposure: Carbon black content of 1.5–2.0% provides long-term UV stabilization for exposed sections.

To generate an accurate quotation, please provide:

1. Application type — slope, channel, load support, retaining wall
2. Project area or volume — total m² or estimated quantity
3. Cell depth preference — 75 / 100 / 150 / 200 mm (or specify site load requirements)
4. Material preference — HDPE or NPA, standard or textured
5. Destination port and country
6. Delivery timeline

Our engineering team can also review project drawings or site photos to recommend the optimum specification.

Yes, SYLVAGEO exports globally. Geocells are lightweight and fold flat for efficient shipping — they are well suited for container export with high packing density.

• Standard production lead time: 15–25 business days from order confirmation
• Custom dimensions: Add 5–10 business days
• Shipping: FOB, CIF, or other Incoterms as agreed
• Documentation: Commercial invoice, packing list, bill of lading, test certificate, CO available

Yes. We provide material samples for quality assessment. Samples include:

• Small panel section (approximately 3×3 cells) showing weld quality
• Material specification sheet with test results
• Installation guide and product catalog

Contact us via the form below with your delivery address and we will arrange sample dispatch.