news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
Galvalume vs Galvanized Substrate for Painted Roofing
Does a Galvalume substrate make painted roofing coil last longer than galvanized? Often yes for unpainted or cut-edge-exposed surfaces in rural, urban and many inland environments, because the aluminum-rich zinc-aluminum metallic coating corrodes more slowly than a conventional zinc coating in those conditions. But “longer” is conditional, not universal. A painted roof’s real durability comes […]
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PPGI Coil Receiving Inspection and Claim Documentation
When a PPGI coil arrives, check four things before the coil leaves the receiving area: the documents against the purchase order and contract, the coil and packaging for transport damage, the dimensions and coil condition, and a documented sample for coating tests. Record every finding with time-stamped photos and a signed inspection report. A claim […]
Read →PPGI Coil Packaging for Ocean Shipping: A Buyer’s Guide
To survive ocean freight without edge rust or coating damage, prepainted galvanized (PPGI) coil should be packed as a sealed, mechanically protected unit: a moisture barrier wrapped tightly around a dry coil, rigid edge and circumference protection, steel strapping that does not crush the wrap, corrosion-inhibiting (VCI) film where the contract requires it, desiccant sized […]
Read →PPGI Coil Roll Forming and Bending Performance
Your PPGI coil will generally not crack or lose paint during roll forming if the paint system is flexible enough for the profile, the substrate grade and thickness suit the bend severity, the metallic coating is sound, and the line is set so that each forming pass takes a small, controlled bite. Cracking and coating […]
Read →PPGI Coil Defects: Peeling, Blistering and Color Difference
If your PPGI coil is peeling, blistering or showing color differences, the cause is usually traceable to one of three areas: the substrate and its metallic coating, the pretreatment and primer layer, or the curing profile of the topcoat. Occasionally it is a mismatch between the paint system and how the coil is formed or […]
Read →PPGI Paint Adhesion and Coating Thickness Inspection
To verify paint adhesion and coating thickness on PPGI coil before accepting a shipment, combine document review with physical testing: check the mill test report against your purchase order, measure dry film thickness with a calibrated magnetic gauge at defined locations, run T-bend and impact tests for flexibility, use cross-hatch adhesion and MEK rub tests […]
Read →PPGI Coil Specifications: Middle East vs Southeast Asia
Yes — in most cases you should expect a different PPGI coil specification for a Middle East project than for a Southeast Asia project, but not because either region has one uniform requirement. The practical drivers differ: hot-dry, high-UV Gulf environments put the paint system and UV stability first, while hot-humid tropical environments put corrosion […]
Read →Passivation and Oiling on Galvanized Coil Before Painting
If your galvanized steel coil will be painted, the short answer is: specify the surface treatment deliberately, not by default. A chromate or chrome-free passivation can be useful or harmful depending on its chemistry and thickness; oiling can protect the surface or contaminate it. Neither is automatically “paint-ready.” The right choice is a documented, mutually […]
Read →PPGI Coil Supplier Factory Audit Questions
Before committing to a PPGI coil supplier, ask for evidence that the factory can control the coating line, pretreatment chemistry, oven curing, laboratory testing, traceability and raw coil sourcing — then verify that evidence on site or through documents. The questions below are structured so a buyer can move from marketing claims to auditable facts. […]
Read →PPGI Coil Paint Warranty: What Is Actually Covered
A PPGI paint warranty typically covers defined defects in the factory-applied paint film itself — such as blistering, cracking, peeling or flaking attributable to the coating — and often sets separate, limited allowances for chalking and colour change. It almost never covers cut edges, field scratches, incompatible fixings, or damage caused by site conditions, forming […]
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