Quality starts with ingredients. Ask the supplier for a detailed breakdown: wood fiber type and source (virgin or reclaimed), polymer type (PE, PP, or PVC), additive package (UV stabilizers, anti‑mold agents, flame retardants). Surface finish is important, but formulation determines long‑term performance. For outdoor use, confirm presence of ASA cap layer or UV inhibitors. For indoor, verify zero‑formaldehyde resin. Necowood provides material disclosure upon request.

Indoor WPC: Lower density, zero‑formaldehyde or low‑VOC resin, often no UV protection. Focus on surface aesthetics and indoor air quality. Outdoor WPC: Requires ASA co‑extrusion or heavy UV stabilizers, water absorption <0.5%, freeze‑thaw resistance, and anti‑mold additives. Using indoor panels outside leads to rapid fading, cracking, and swelling. Necowood clearly separates product lines with distinct specifications and certifications.

Request:

• Batch test reports from recent months (water absorption, density, color coordinates).
• Video call during production to see extrusion line and quality lab in real time.
• Third‑party inspection reports (e.g., SGS, TÜV, Intertek) from recent shipments.
• Customer references – contact previous importers about their experience.

If you visit in person (or hire a local agent), inspect these areas:

Ask for at least 5 full‑size panels from current production. Run these tests:

• Water absorption: Soak in water for 24h, measure weight change. Good WPC: <0.5%.
• Color consistency: Place panels side by side, measure Delta E (should be <2.0).
• Embossing depth: Use a depth gauge – ≥0.3mm for realistic grain.
• Dimensional tolerance: Measure length, width, thickness – variation ≤0.2mm per meter.
• Surface defects: Check for bubbles, cracks, or uneven texture under good light.

Necowood can provide a sample evaluation sheet to help you record your findings. We also recommend using an independent laboratory for verification, especially for high‑volume or critical projects.

Ask for:

• Monthly production capacity (in square meters or containers).
• Current order backlog and average lead time for new orders.
• Inventory of common colors/sizes – ready to ship within 7 days.
• Past shipment records (bill of lading copies) showing export volume and destinations.

Red flags: Vague capacity claims, lead times that change after deposit, or inability to provide shipping documents.