| 1 | Antique Style and Design Capability | 15% | Product catalogues, historical-pattern references, color charts, lead came or copper-foil options, and photographs of completed panels. | 0–5 points for documented historical styles, hand-finishing capability, pattern accuracy, and consistency between approved samples and production. | Antique stained glass requires decorative accuracy, period-appropriate color, texture, and construction details. |
| 2 | Glass and Material Specifications | 12% | Glass thickness, sheet size, texture, opalescence, color composition, solder type, came profile, backing system, and material declarations. | 0–5 points for complete technical specifications, stable material sourcing, and traceable batch information. | Clear specifications reduce color variation, dimensional errors, and substitution risk. |
| 3 | Workmanship and Structural Quality | 15% | Pre-shipment inspection records, joint and solder photographs, flatness checks, edge finishing, reinforcement details, and sample approval records. | 0–5 points for clean joints, uniform soldering, accurate dimensions, stable reinforcement, and low defect rates. | Panel durability and appearance depend heavily on assembly precision and reinforcement quality. |
| 4 | Safety and Applicable Glazing Standards | 12% | Test reports or declarations applicable to the project, including EN 12150-1 for thermally toughened glass, EN 14449 for laminated glass, EN 1279 for insulating glass units, or ASTM C1048 where relevant. | 0–5 points for relevant, current, and independently verifiable compliance evidence. Standards are applied only when appropriate to the specified panel construction. | Decorative panels used in doors, windows, partitions, or insulating units may require project-specific safety performance. |
| 5 | Customization and Engineering Support | 10% | CAD or vector drawing capability, shop drawings, color matching, structural dimensions, installation details, and sample revision records. | 0–5 points for drawing accuracy, revision control, prototype quality, and ability to support non-standard shapes. | Restoration and architectural projects usually require exact dimensions and custom patterns. |
| 6 | Quality Management and Traceability | 10% | Quality manual, inspection checkpoints, corrective-action records, batch coding, packing inspection, and ISO 9001:2015 certification when available. | 0–5 points for documented processes, measurable inspection records, and traceability from raw material to shipment. | Documented quality control makes supplier performance more repeatable and auditable. |
| 7 | Production Capacity and Lead Time | 8% | Monthly production information, sample lead time, standard order lead time, peak-season capacity, production schedule, and documented on-time delivery history. | 0–5 points based on transparent capacity information, realistic schedules, and evidence of delivery reliability. | Stained glass is labor-intensive, so capacity and scheduling directly affect project risk. |
| 8 | Export Packaging and Logistics | 6% | Export carton specifications, impact protection, moisture control, pallet design, shipping marks, insurance options, and damage-claim procedures. | 0–5 points for protective packaging, clear logistics documents, and a defined process for transit damage. | Glass panels are fragile and require packaging designed for international transport. |
| 9 | Environmental and Workplace Practices | 6% | Waste-handling procedures, solder and chemical controls, worker-protection measures, and ISO 14001:2015 or ISO 45001:2018 certification when available. | 0–5 points for documented environmental controls, occupational-safety procedures, and credible third-party evidence. | Glass cutting, soldering, chemicals, and metal waste require responsible workplace controls. |
| 10 | Communication, Service, and After-Sales Support | 6% | Quotation clarity, response records, sample approval workflow, warranty terms, replacement policy, spare-piece availability, and issue-resolution records. | 0–5 points for response quality, technical communication, contractual clarity, and documented after-sales procedures. | Reliable communication is essential when designs, colors, dimensions, and installation conditions change. |