| Material Authenticity | Solid wood species and component percentage | The quotation should clearly distinguish solid wood, engineered wood, veneer, MDF, particleboard, and honeycomb components. Do not accept the term “solid wood” without a component specification. | Material specification sheet, cross-section drawings, veneer description, and written confirmation of all core materials. | Compare the specification with a pre-production sample and inspect cut sections or concealed areas during third-party inspection. | 15% | High |
| Wood Moisture | Moisture content at production and shipment | Set the target according to the destination climate and installation environment. A common project target for interior wood products is approximately 8%–12%, subject to local equilibrium moisture conditions. | Moisture-control procedure, kiln-drying records, batch inspection reports, and a defined acceptance range in the purchase contract. | Measure several doors from different production batches with a calibrated moisture meter; record the location and reading of each test. | 15% | High |
| Dimensional Stability | Warping, bowing, twisting, and size tolerance | The supplier should state allowable tolerances for height, width, thickness, squareness, and flatness. Tolerances must be agreed before production rather than defined after delivery. | Technical drawings, tolerance schedule, quality-control checklist, and corrective-action procedure. | Use a straightedge, feeler gauge, tape measure, and diagonal measurements during final inspection. | 12% | High |
| Surface Finish | Coating consistency, adhesion, color, and visible defects | The approved sample should define acceptable limits for color variation, pinholes, runs, orange peel, scratches, open joints, and veneer mismatch. | Signed golden sample, finish sample board, coating system details, and inspection photographs under neutral lighting. | Compare mass-production doors with the approved sample under consistent lighting and inspect both visible faces and edges. | 10% | Medium |
| Indoor Air Safety | Formaldehyde emission from wood-based components | For products containing MDF, particleboard, plywood, or other composite panels, request test results against the destination-market requirement. Under the commonly used E1 limit based on EN 717-1 or GB 18580, formaldehyde emission is no more than 0.124 mg/m³. | Recent laboratory report identifying the tested product, panel construction, test method, laboratory, and report date. | Confirm that the report applies to the quoted construction and, where necessary, arrange independent laboratory testing. | 12% | High |
| Structural Performance | Door leaf construction, joints, core, and reinforcement | The supplier should provide a cross-section showing stiles, rails, panels, core material, adhesive areas, and reinforcement for hinges, locks, and closers. | Cross-sectional drawing, assembly process, adhesive specification, and load or cycle-test records where required by the project. | Review drawings before sampling and inspect concealed construction on a randomly selected production unit. | 10% | High |
| Hardware Compatibility | Hinge, lock, closer, and bore preparation | All hardware preparation must match the buyer’s selected hardware model, backset, handing, drilling template, and installation direction. | Hardware schedule, drilling templates, shop drawings, and compatibility confirmation for supplied or buyer-nominated hardware. | Fit-test a complete door set with the actual hardware before mass production. | 8% | High |
| Fire and Acoustic Requirements | Rated performance where applicable | Do not assume that a solid wood door is automatically fire-rated or sound-rated. The complete door assembly must be tested for the required market and configuration. | Valid test report for the complete door set, including leaf, frame, seals, glazing, hardware, and installation configuration where applicable. | Verify the report scope, test standard, specimen construction, rating, issuing laboratory, and validity before accepting the claim. | 8% | High |
| Production Capability | Capacity, process control, and customization ability | The supplier should demonstrate stable control of timber drying, machining, assembly, finishing, packaging, and project-specific customization. | Process flow, equipment list, quality-control plan, sample-production records, and anonymized project references. | Conduct a video audit, remote factory audit, or independent on-site audit; confirm that the audited facility is the actual production location. | 8% | Medium |
| Quality Assurance | Inspection plan and traceability | Every batch should be traceable by production date, order number, material batch, finish, inspection status, and packaging identification. | Incoming-material inspection, in-process inspection, final inspection, nonconformity records, and corrective-action reports. | Review sample records and check whether carton labels and production documents match the shipped goods. | 8% | High |
| Packaging and Logistics | Protection against moisture, impact, and deformation | Packaging should protect finished surfaces, corners, hardware, and door geometry throughout inland transport, container loading, and destination handling. | Packaging specification, carton or crate design, loading photographs, pallet plan, and moisture-protection procedure. | Inspect one packed sample and verify container loading, carton labels, desiccant use where required, and vertical or horizontal storage instructions. | 5% | Medium |
| Commercial Reliability | Quotation clarity, payment terms, and change control | The quotation should identify door construction, dimensions, finish, hardware scope, packaging, Incoterms, tooling, inspection, lead time, and exclusions. | Detailed quotation, pro forma invoice, specification annex, production schedule, and written change-order procedure. | Compare the quotation, approved drawings, purchase contract, and commercial invoice line by line. | 4% | Medium |
| Export Documentation | Customs, origin, packing, and shipment documents | Documents should be consistent with the actual goods and destination requirements, including commercial invoice, packing list, transport document, and origin information where required. | Document checklist, sample export documents with sensitive information removed, packaging marks, and customs classification support. | Ask a freight forwarder or customs broker to review the documentation before shipment. | 3% | Medium |
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