Doors

For residential use, prioritize solid wood (oak, walnut, mahogany) for aesthetics or engineered wood (MDF/HDF) with wood veneers for cost-efficiency and warp resistance. For commercial or industrial applications, galvanized steel or stainless steel is essential for durability. Ensure hollow metal doors have a honeycomb, polystyrene, or polyurethane core to meet specific thermal insulation and sound transmission class (STC) requirements.

Safety is paramount in door sourcing. Ensure products meet UL 10B or UL 10C (US) or EN 1634 (EU) for fire-rated performance (e.g., 30, 60, or 90-minute ratings). For external doors, verify CE Marking or ASTM standards for wind pressure resistance, water tightness, and air permeability. If sourcing for public buildings, compliance with ADA (Americans with Disabilities Act) for door width and opening force is critical.

The door's lifespan depends on its hardware. Specify 304 or 316 stainless steel hinges to prevent rust, especially in humid climates. Request cycle tests for handles and locks—high-quality commercial hardware should exceed 200,000 cycles. For sliding or folding doors, ensure the track system is made of heavy-duty aluminum with anti-jump rollers capable of supporting at least 100kg-150kg per panel.

A top-tier supplier should offer OEM/ODM services, including CAD/BIM drawing support for architectural integration. Look for the ability to customize dimensions (height/width), surface finishes (PU paint, UV coating, or melamine), and glass inserts (tempered, frosted, or low-E glass). Verify if the supplier can provide pre-hung options (door leaf + frame + architrave) to significantly reduce on-site installation time and labor costs.

The biggest risk is physical damage (warping or scratching) during transit. Insist on seaworthy packaging, such as EPE foam protectors, 5-layer corrugated cartons, and solid wooden crates or pallets. To mitigate financial risk, use Trade Resources on Made-in-China.com and consider third-party inspections (SGS or Intertek) before the final balance payment to verify moisture content (ideally 8%-12%) and finish quality.

Doors are heavy and bulky, so shipping costs significantly impact the unit price. Negotiate based on Full Container Load (FCL) to minimize per-unit freight costs. For MOQs, many manufacturers require 20-50 sets for custom designs but may offer 1-5 sets for standard stock. Request a tiered pricing structure where a 15-20% discount is applied when moving from LCL to FCL volumes.

Check for anti-dumping duties on specific materials (like certain steel or wooden doors) in your target country. Ensure the supplier provides a Fumigation Certificate if solid wood packaging is used. For shipping to the US or Europe, ensure all wood components comply with Lacey Act or EUTR regulations regarding legal timber sourcing. Always clarify Incoterms; FOB (Free on Board) is generally preferred for buyers who have their own freight forwarders to control costs.