| Base material | 20% | Confirm the specified material and grade, such as stainless steel, carbon steel, aluminum, or zinc alloy. Suitability depends on the environment and design. | Material specification, supplier declarations, and material test reports for the quoted product or production batch. For stainless steel, verify the stated grade against relevant documentation. | The material, grade, and finish are identified clearly in the quotation and drawings; documents can be linked to the supplied parts. |
| Load performance | 20% | Check the stated load rating for the actual bracket, fixing method, shelf dimensions, glass thickness, and installation conditions. There is no single load rating that applies to every bracket setup. | A documented test method and results for representative samples, including test configuration, applied load, duration, and observed deformation or failure. | The supplier’s rating is supported by testing that closely matches your intended shelf and installation; confirm project-specific acceptance limits before ordering. |
| Finish and corrosion resistance | 15% | Inspect coating or plating consistency, color, coverage, and resistance requirements for the intended indoor or damp environment. | Finish specification and sample parts. Where relevant, request corrosion-test results with the test method and exposure time stated; ISO 9227 describes salt-spray testing but does not by itself set a universal pass requirement for every product. | Agree on a sample and measurable acceptance criteria before production. Reject vague claims such as “rust-proof” without supporting details. |
| Dimensions and fit | 10% | Check dimensions that affect installation and glass contact, including bracket size, hole positions, glass thickness range, and any pads or inserts. | Dimensioned drawings, tolerance details for critical features, and samples checked against the approved drawing. | The supplier confirms compatibility with your glass specification and installation hardware in writing, rather than relying only on a catalog description. |
| Quality control | 15% | Review how incoming materials, production processes, and finished parts are inspected, and how nonconforming products are handled. | Inspection plan, sample inspection records, defect-handling procedure, and any current quality-system certification. Verify certification scope and validity with the issuing body where possible. | Inspection criteria are documented, production records are available, and corrective actions can be explained with examples. |
| Manufacturing capability | 10% | Assess whether the supplier can consistently produce the required forming, machining, welding, polishing, or finishing operations. | Production-process overview, relevant equipment or subcontracting details, production samples, and confirmation of how outsourced processes are controlled. | The supplier explains the process from raw material to finished product and identifies responsibility for any outsourced operations. |
| Traceability and documentation | 5% | Check whether production lots and key material or inspection records can be identified after delivery. | Example carton or batch labels, packing list, inspection report, and a description of record-retention practices. | The supplier can connect delivered goods to a production batch and provide agreed documentation with the shipment. |
| Packaging and delivery readiness | 5% | Evaluate protection against scratches, finish damage, and missing mounting components during handling and transport. | Packaging photos or samples, carton details, and a written list of included accessories and labeling information. | Packaging is appropriate for the shipping route, and the packing list matches the agreed product and accessory configuration. |