Sandwich panel manufacturers

Selecting the core material depends on your specific application needs. EPS (Expanded Polystyrene) is cost-effective and lightweight, ideal for cold storage. Rock Wool is the gold standard for fire resistance (Class A) and sound insulation. PU/PIR (Polyurethane/Polyisocyanurate) offers the highest thermal insulation performance with a low thermal conductivity coefficient, making it perfect for energy-efficient buildings.

You must confirm the steel skin thickness (typically 0.4mm to 0.8mm) and the zinc coating mass (e.g., Z275) to ensure corrosion resistance. For the core, check the density (e.g., 100-120kg/m³ for Rock Wool or 40kg/m³ for PU). Additionally, verify the effective width and joint type (tongue-and-groove or cam-lock) to ensure seamless installation.

For the European market, CE marking and compliance with EN 14509 are mandatory. For US-bound goods, look for ASTM E84 (surface burning characteristics) or FM Global approval. Ensure the manufacturer holds ISO 9001:2015 for quality management to guarantee consistent production standards across large batches.

Focus on the outer coating material; PVDF coatings offer superior UV resistance and color retention compared to PE coatings. Request salt spray test reports if the panels will be used in coastal or industrial environments. A high-quality sandwich panel should have a service life of 15-25 years with proper maintenance.

The biggest risk is physical damage (denting or scratching) during transit. Ensure the supplier uses protective PE film on both sides of the panels and employs reinforced wooden pallets or steel frames for container loading. Always insist on Full Container Load (FCL) shipping to minimize handling risks associated with LCL.

Focus on Total Cost of Ownership (TCO) rather than just the unit price. Negotiate for volume-based discounts (typically 5-10% for orders over 1,000sqm) and ask for free spare parts like flashings, screws, and sealants. Use the Secured Trading Service on Made-in-China.com to protect your payment until the goods pass inspection.

Never release the full payment upfront. A standard practice is a 30% deposit and 70% balance against the Bill of Lading (B/L). For large orders, hire a third-party inspection agency (like SGS or Intertek) to conduct a pre-shipment inspection to verify core density, panel thickness, and quantity.

Be aware of Anti-Dumping Duties (ADD) or Countervailing Duties that some countries impose on Chinese steel products. Check your local HS Code (typically 730890 or 3921) regulations. Ensure the supplier provides a Certificate of Origin to help you benefit from any existing Free Trade Agreements (FTA) and reduce import tariffs.