Gabion mattress

When sourcing Gabion Mattresses, you must prioritize wire diameter, mesh size, and coating type. For standard hydraulic projects, a wire diameter of 2.0mm to 2.7mm is common. The mesh type is typically double-twisted hexagonal wire mesh (6x8cm or 8x10cm), which prevents the structure from unraveling if a wire is cut. Ensure the selvedge wire is thicker than the body wire to provide structural reinforcement at the edges.

The choice of coating determines the lifespan of the product. For mild environments, Heavy Galvanized (Zinc coating >240g/m²) is sufficient. For high-salinity coastal areas or polluted waters, you must specify Galfan coating (95% Zinc + 5% Aluminum) or PVC/PE coating over galvanized wire. PVC coating provides an additional 10-15 years of service life by protecting against chemical corrosion and UV radiation.

Suppliers should adhere to international standards such as ASTM A975 (Standard Specification for Double-Twisted Hexagonal Mesh Gabions) or EN 10223-3. You should request ISO 9001 certification for the factory and mill test certificates that verify the tensile strength of the wire (usually 350-500 N/mm²) and the uniformity of the zinc coating.

Gabion Mattresses (also known as Reno Mattresses) are characterized by their low height (0.17m to 0.3m) and large surface area. They are designed for flexibility and soil protection on riverbanks and channel linings to prevent scour. In contrast, Gabion Baskets are box-shaped and used for retaining walls and gravity structures. Ensure your supplier provides internal diaphragms every 1 meter to limit stone movement.

Always request a pre-shipment inspection (PSI). For Gabion Mattresses, the inspector should specifically check the mesh aperture uniformity and the adhesion of the PVC coating (via a mandrel wrap test). Using Made-in-China.com's Secured Trading services can provide an extra layer of protection, ensuring payment is only released upon confirmation of shipping documents.

Gabion Mattresses are shipped folded flat and bundled to maximize container space. A standard 20GP container can hold approximately 15-20 tons depending on the wire gauge. To optimize costs, negotiate FOB (Free On Board) terms if you have a reliable freight forwarder, or CIF (Cost, Insurance, and Freight) if you prefer the supplier to handle the logistics to your destination port.

Focus on the Zinc coating weight and wire gauge as these are the primary cost drivers. If the price is significantly lower than market average, the supplier may be using cold-galvanized wire (low zinc) instead of hot-dipped. Demand a guarantee on the coating weight in the contract. For large infrastructure projects, ask for volume-based discounts (typically 5-8% for orders over 5,000 square meters).

Verify the HS Code (typically 7314.41 or 7326.20) to check for anti-dumping duties in your country (e.g., some regions have specific tariffs on Chinese steel products). Ensure the supplier provides a Certificate of Origin (CO), which may help in reducing import duties under certain Free Trade Agreements.