| Product specification | ASTM A792/A792M, EN 10346, or JIS G 3321, according to the purchase contract | Confirm the applicable standard, steel grade, yield strength, tensile strength, elongation, thickness, width, and dimensional tolerances. | Product datasheet, approved technical specification, and heat or batch test certificate | The certificate and coil markings should match the ordered grade, dimensions, and applicable standard. | Required |
| Aluminum-zinc coating composition | Coating composition should be stated in the product specification; common commercial Galvalume coatings are aluminum-zinc based with a small silicon addition. | Check the declared coating chemistry and confirm that it is suitable for the intended forming, roofing, cladding, or industrial application. | Technical data sheet, material certificate, and coating composition declaration | Do not accept an unspecified “aluminum-zinc coating” description when the project requires a defined coating chemistry. | Required |
| Coating mass | ASTM A792/A792M or the agreed project specification; coating mass is normally expressed as total coating mass on both sides in g/m². | Verify the ordered coating designation, test method, minimum coating mass, and whether the quoted value is total or single-side mass. | Coating-mass test results, inspection report, and purchase-order confirmation | The reported coating mass must use the same unit, test basis, and acceptance limits as the contract. | Required |
| Mechanical properties | The selected grade standard defines requirements for yield strength, tensile strength, and elongation. | Confirm that the grade is appropriate for deep drawing, roll forming, structural use, or general applications. | Mill test certificate with heat number, test direction, and mechanical test values | Compare every reported value with the minimum and maximum limits in the agreed standard. | Required |
| Surface quality | Surface requirements should be defined in the applicable standard and purchase specification. | Inspect for scratches, dents, edge damage, black spots, excessive spangle variation, oil stains, and handling marks. | Pre-shipment photographs, inspection checklist, and agreed visual-acceptance criteria | Define permissible surface defects before production and identify whether the material is for exposed or non-exposed use. | Required |
| Flatness and shape | Dimensional and shape tolerances should follow the selected product standard or the project specification. | Review flatness, crown, edge wave, camber, and coil shape requirements, especially for automated processing lines. | Dimensional inspection report and calibrated measurement records | Use the same measurement method and tolerance limits for supplier inspection and incoming inspection. | Required |
| Coil dimensions and weight | Dimensions should be stated in the purchase order, including thickness, width, inside diameter, outside diameter, and maximum coil weight. | Check whether the supplier can consistently meet line-compatible dimensions and lifting or transport limits. | Coil list, packing list, dimensional report, and calibrated weighing records | Verify actual coil data against the order before shipment and confirm identification on each coil. | Required |
| Quality management system | ISO 9001 certification demonstrates conformity to a quality management system, but it does not replace product testing. | Check the certificate scope, validity period, certification body, manufacturing site, and whether coil production is covered. | Current ISO 9001 certificate and latest surveillance or recertification status | The certificate should be current and issued for the actual facility supplying the material. | Strongly Recommended |
| Environmental management | ISO 14001 may be relevant for customers with environmental procurement requirements. | Review whether the supplier controls waste, emissions, energy use, chemicals, and environmental legal compliance. | Current ISO 14001 certificate and environmental policy or audit summary | Confirm that the certificate scope covers the production site and relevant steel-coil processes. | Conditional |
| Occupational health and safety | ISO 45001 may be requested for supplier qualification and responsible sourcing programs. | Evaluate workplace safety controls, incident management, contractor safety, and emergency procedures. | Current ISO 45001 certificate and supplier safety assessment | Use it as part of supplier-risk evaluation rather than as evidence of Galvalume product conformity. | Conditional |
| Laboratory competence | ISO/IEC 17025 applies to the competence of testing and calibration laboratories. | Determine whether mechanical, coating-mass, chemical, and dimensional tests are performed by a competent internal or external laboratory. | Laboratory accreditation scope, calibration certificates, and test reports | The reported test should fall within the laboratory’s accredited scope where accreditation is required by the project. | Conditional |
| Traceability | Traceability should link the finished coil to the heat, batch, production date, test results, and inspection records. | Check whether coil numbers remain linked to the heat number throughout slitting, recoiling, storage, and shipment. | Heat certificate, coil labels, production records, and traceability procedure | Randomly select a coil and confirm that its label can be matched to all relevant quality documents. | Required |
| Inspection and testing plan | The inspection plan should define sampling frequency, test methods, acceptance limits, and responsibilities. | Review how the supplier controls incoming material, coating, mechanical properties, dimensions, surface quality, and final release. | Inspection and test plan, process-control plan, and nonconformance procedure | Require documented corrective action for deviations and approval before shipment of nonconforming coils. | Required |
| Certificate of conformity | A certificate of conformity should identify the product, standard, grade, coating designation, dimensions, and inspection status. | Confirm that the certificate is issued for the actual shipment rather than being a generic company document. | Certificate of conformity, mill test certificate, and shipment-specific coil list | All document details should be consistent with coil labels, packing records, and the purchase order. | Required |
| Packaging and corrosion protection | Packaging requirements should reflect transport conditions, storage duration, and the risk of wet storage stain. | Check edge protection, waterproof wrapping, coil orientation, strapping, desiccant use where applicable, and loading practices. | Packaging specification, loading photographs, and handling instructions | Packaging should prevent mechanical damage and reduce exposure to water during transport and storage. | Required |
| Pre-shipment inspection | Inspection may be performed by the buyer, an independent inspection body, or the supplier under an agreed inspection plan. | Confirm inspection timing, sampling level, access to production records, and authority to release or hold the shipment. | Signed inspection report, test records, photographs, and approved release note | Use independent inspection for high-value, first-order, or technically critical purchases. | Recommended for Risk Control |
| Nonconformance handling | The supplier should maintain a documented process for identification, segregation, root-cause analysis, and corrective action. | Ask how claims involving coating mass, surface defects, dimensions, or mechanical properties are investigated. | Nonconformance report, corrective-action report, and replacement or credit procedure | Agree on claim response time, evidence requirements, disposition options, and responsibility for related costs. | Required |
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