news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
PPGL Cut-Edge Corrosion: Causes and Protection Methods
PPGL coil cut-edge corrosion occurs because the shearing process exposes the underlying metallic coating and steel substrate, which are anodic to the surrounding painted surface. In roofing applications, the most effective protection methods combine correct cut-edge sealing, proper profile design, and controlled storage conditions. This article explains the electrochemical mechanism behind edge corrosion, compares practical […]
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PPGI Coil Defects and Claims: A Complete Buyer’s Guide
If you are asking what the most common PPGI coil defects are and what evidence you need for a successful claim, the short answer is this: the most frequent defects are coating adhesion failure, color deviation, surface scratches, edge damage, and dimensional inaccuracy. To file a successful claim, you need clear photographic evidence, a signed […]
Read →PPGI Pre-Shipment Inspection: A Step-by-Step Checklist for Buyers
When you order PPGI coils from overseas, the physical product you receive should match the technical specifications in your contract—not just the sample you approved. A pre-shipment inspection (PSI) with a third-party inspector is the primary control point to verify this before payment and dispatch. This article provides a practical, step-by-step checklist covering what to […]
Read →PPGI Export Packaging: Seaworthy Packing and Inspection Guide
Seaworthy packing for PPGI coils means the packaging system is engineered to protect the coil from corrosion, mechanical damage, and moisture ingress during ocean freight, and it includes six core components: moisture-proof inner wrapping, rust-preventive VCI paper, rigid metal outer wrapping, edge protection, wooden or steel skids, and secure steel strapping. To avoid damage, you […]
Read →PPGI Custom Color Matching: How to Get a Perfect RAL Match for Your Project
Getting a precise RAL color match on a PPGI coil is not a single step, but a controlled process of specification, digital measurement, and physical sampling. To get the exact color you need, you must provide your supplier with four things: a valid RAL code, the substrate and metallic coating type, the paint system, and […]
Read →PPGI Gloss Levels 20, 40, or 70: How to Choose
When you are sourcing prepainted galvanized steel (PPGI) coil, the gloss level is often the first specification a buyer asks about, yet it is also one of the most misunderstood. In simple terms, a gloss level of 20 is a matte finish, 40 is a semi-gloss, and 70 is a high-gloss finish. The right choice […]
Read →PPGI Coil Thickness Tolerances: ASTM A755 vs. EN 10169
For importers and roll formers, the short answer is that ASTM A755 and EN 10169 define thickness tolerances differently: ASTM A755 typically references the base metal thickness tolerances of ASTM A653/A653M, while EN 10169 applies the thickness tolerance rules of EN 10143. Neither standard guarantees a single universal number; both allow ranges that vary by […]
Read →PPGI vs Galvanized Steel for Cold Storage Panels: A Performance Guide
For cold storage panels, the primary advantage of PPGI (pre-painted galvanized steel) over standard galvanized steel (GI) is its engineered corrosion barrier and surface durability. While both share a zinc-based metallic coating, PPGI adds a factory-applied paint system that protects against condensation, cleaning chemicals, and physical wear—conditions common in temperature-controlled environments. This guide compares both […]
Read →PPGI Coils for Solar Mounting: Coating and Strength Explained
Yes, PPGI coil is a suitable and widely used material for solar panel mounting structures, provided you select the correct substrate, metallic coating, paint system, and thickness for the specific environment and load requirements. The short answer for most ground-mount and commercial rooftop projects is a hot-dip galvanized steel substrate (not cold-rolled) with a AZ […]
Read →A Practical PPGI Coil Inspection Checklist for Importers Before Shipment
When you inspect PPGI coils at the factory or upon arrival, the key parameters to check are coating thickness, color consistency, gloss level, reverse/edge damage, hardness, and mechanical properties like T-bend and impact resistance. However, the most important step is to verify that every inspection method and acceptance limit matches the exact values written in […]
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