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| Property | Parameter | Description |
|---|---|---|
| Product Name | Color-Coated Corrugated Roofing Sheets | Pre-painted profiled steel sheets for roofing and cladding applications |
| Material Grade | S250GD, S280GD, S320GD, S350GD (EN); CGCC, CGCD (JIS G3312); Q235, Q345 (GB) | Hot-dip galvanized or galvalume base metal with organic coating; equivalent to ASTM A755M |
| Standard Compliance | EN 10169, JIS G3312, GB/T 12754, ASTM A755M | Meets international standards for continuously organic-coated flat-rolled steel products |
| Chemical Composition | C ≤ 0.12%, Mn ≤ 0.60%, P ≤ 0.030%, S ≤ 0.025%, Si ≤ 0.50% | Base steel chemistry per EN 10346 / GB/T 2518; zinc coating: Zn ≥ 99.7% |
| Tensile Strength | 320–500 MPa (S280GD); 360–510 MPa (S320GD) | Per EN 10169 / GB/T 12754; higher grades available upon request |
| Yield Strength | ≥ 250 MPa (S250GD); ≥ 280 MPa (S280GD); ≥ 320 MPa (S320GD) | Minimum yield strength ensuring structural rigidity under wind and snow loads |
| Elongation | ≥ 16% (A80mm, S250GD–S320GD) | Per EN 10169; ensures formability during roll-forming and installation |
| Base Metal Thickness | 0.30–1.20 mm (BMT); total coated thickness 0.35–1.25 mm | Common roofing gauges: 0.40 mm, 0.47 mm, 0.50 mm, 0.60 mm BMT |
| Sheet Width | Effective width: 760–1050 mm; coil width up to 1250 mm | Effective coverage width depends on corrugation profile (e.g., 762 mm, 900 mm, 1000 mm) |
| Sheet Length | 1000–12000 mm (custom cut-to-length) | Standard lengths: 1.8 m, 2.4 m, 3.0 m, 6.0 m; custom lengths available |
| Corrugation Profile | Wave height: 18–36 mm; pitch: 76–130 mm | Typical profiles: 762 corrugated, IBR, Trimdek; custom profiles on request |
| Coating System | Top coat: PE (polyester) 15–25 μm; PVDF 25 μm; SMP 20 μm; primer: 5–7 μm; back coat: 7–15 μm | Zinc/galvalume base + chromate passivation + primer + top coat; total DFT per EN 13523 |
| Surface Finish | RAL color chart (3000+ colors); matte, gloss, textured, embossed options | Gloss level: 30–85 GU (60° geometry); UV-resistant and weather-resistant finish |
| Application | Industrial warehouses, commercial buildings, residential roofing, agricultural structures, wall cladding | Suitable for tropical, coastal, and high-humidity environments depending on coating grade |
| Certification | ISO 9001:2015, CE Marking (EN 14782), SGS, BV, TÜV | Third-party inspection and mill test certificates (MTC) available per EN 10204 3.1 |
| Packaging | Bundles of 10–50 sheets; wrapped in waterproof kraft paper + steel strapping; palletized | Export seaworthy packaging; fumigation certificate available for wooden pallets |
| MOQ | 5 metric tons per color/profile | Mixed container orders accepted; standard 20' FCL ≈ 18–22 MT depending on thickness |
Initial Color Mismatch Resolved Promptly — Now a Satisfactory Supplier
First order of 0.4mm polyester corrugated sheets in a custom RAL color for a retail client arrived with a visible gloss variance — measured at 38 GU against an approved 50 GU sample. I raised this immediately. The supplier's QC team reviewed the batch records, confirmed a coating line parameter deviation, and arranged replacement panels within 18 days at no additional cost. The replacement shipment was spot-on. I appreciate that the issue was handled professionally rather than disputed. Confidence is now restored and I am proceeding with a second order, this time with pre-shipment gloss verification included in the contract.
First order of 0.4mm polyester corrugated sheets in a custom RAL color for a retail client arrived with a visible gloss variance — measured at 38 GU against an approved 50 GU sample. I raised this immediately. The supplier's QC team reviewed the batch records, confirmed a coating line parameter deviation, and arranged replacement panels within 18 days at no additional cost. The replacement shipment was spot-on. I appreciate that the issue was handled professionally rather than disputed. Confidence is now restored and I am proceeding with a second order, this time with pre-shipment gloss verification included in the contract.
