news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
PPGI Bending Cracking at Low Temperature: Causes and Fixes
Prepainted galvanized (PPGI) coil cracks when bent in winter because the paint film becomes harder and less able to stretch as its temperature falls, while the steel substrate and metallic coating also change behaviour. If the bend radius is tight, the substrate grade has limited ductility, the paint system was cured too hard, or the […]
Read →PPGI Roll Forming Line Settings That Prevent Coating Damage
If your PPGI coil cracks or scuffs during roll forming, the cause is usually a combination of excessive roll pressure, bend radii that are too tight for the coating system, dry or unsuitable lubricant, and abrasive handling between the decoiler and the stacker. The practical fix is to treat the forming line, the lubricant and […]
Read →PPGI High-UV Tropical Roof Specification Guide
To stop a prepainted roof from fading and chalking quickly in strong sunlight, specify the topcoat resin chemistry, pigment system and dry film thickness together — not colour alone. A dark or “UV-resistant” colour name tells you almost nothing about whether the paint will hold its gloss and hue after years of tropical ultraviolet (UV) […]
Read →PPGI Color Matching: Delta E & Batch Consistency
To set a realistic color and gloss tolerance for PPGI coil, work in a defined color space (usually CIELAB), agree a Delta E limit that matches how visible a shift will be on the finished panel, fix a gloss range rather than a single gloss number, and state all of it in the purchase order […]
Read →PPGI Supplier Audit: Factory Capability Checklist
To verify a PPGI coil manufacturer before ordering, audit five things in sequence: the continuous painting line itself, where the substrate comes from, how the supplier tests coating and mechanical properties, whether coil identity can be traced from heat number to shipping mark, and whether export documents match the contract. A supplier that cannot show […]
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PPGL Galvalume Prepainted Coil Specification Guide
The specification points that matter most when ordering PPGL (prepainted galvalume) coil are: the metallic coating mass and designation (AZ), the steel substrate grade and mechanical properties, the paint system chemistry and dry film thickness, the surface treatment and pretreatment, the coil dimensions and tolerances, and the inspection documents that prove all of the above. […]
Read →PPGI vs PPGL Prepainted Galvalume Comparison
For most roofing and wall-panel projects, the practical answer is this: choose PPGI (prepainted hot-dip galvanized steel) when the building is in a mild-to-moderate environment and the cut edges will be sealed, covered or painted; choose PPGL (prepainted galvalume steel, i.e. zinc-aluminium coated) when you need better cut-edge protection, higher heat and UV reflection, or […]
Read →PPGI Defect Claims: Evidence and Settlement Process
To file and win a PPGI coil quality claim with a Chinese supplier, notify the seller in writing within the contractual claim period, freeze the disputed coil and its packaging, document the defect with dated photos, video, batch/lot data and mill test certificates, then commission an independent inspection that follows a standard both parties accepted […]
Read →PPGI Coil Inspection Certificate and Mill Test Certificate Guide
What documents and inspections should come with a PPGI coil shipment? At minimum, expect a mill test certificate (MTC) or inspection certificate covering heat number, dimensions, substrate and coating masses, plus a paint system datasheet, packing list, and — for most export orders — a third-party pre-shipment inspection report such as an SGS, BV, Intertek […]
Read →PPGI Coil Packaging for Sea Freight Rust Prevention
To bring PPGI coil through sea freight without rust or edge damage, treat packaging as an engineered moisture and impact system, not as wrapping. In practice: orient the coil eye-to-sky on a dry, ventilated skid; wrap it in VCI film or VCI paper; seal it against liquid water; add desiccant sized to the enclosed air […]
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