news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
Why the Back Side of PPGI Coil Matters: Primer and Back Paint
When you order PPGI coils for roofing sheets in a humid climate, the back paint is not a cosmetic detail—it is a corrosion-control decision. The functional difference between epoxy, polyester, and primer-only systems is about moisture barrier performance, adhesion to the metallic coating, and formability. In short: a well-specified reverse-side coating can delay edge and […]
Read →PPGI Coil Paint Thickness: DFT vs. TBT in Coating Specs
If you are comparing quotes from PPGI suppliers and seeing some specify dry film thickness (DFT) while others specify total build thickness (TBT), the short answer is: you need to specify both, but DFT is the number that governs corrosion and durability performance. TBT is a useful process control check, but DFT per layer tells […]
Read →PPGI Coil: Total Landed Cost vs. Price Per Ton – The Real Procurement Math
When you compare PPGI coil suppliers, the price per ton is the first number you see, but it is rarely the number that determines your true material cost. The total landed cost—which includes freight, insurance, duties, financing, and handling—can shift your procurement decision by a significant margin. This article explains how to calculate that figure […]
Read →PPGI for Sandwich Panels: Core Adhesion Specifications
The single most critical PPGI coil specification for reliable sandwich-panel bonding is the backer coating system, not the topcoat. For polyurethane (PU), polyisocyanurate (PIR), and rockwool cores, the reverse-side paint must be formulated for chemical and mechanical compatibility with the specific adhesive or foaming process. In short, you need a PPGI with a dedicated reverse-side […]
Read →PPGI Roofing Screw Corrosion: Why Fasteners Fail and How to Avoid It
If you are asking, “Why are the screws on my PPGI roof corroding, and what type of fastener should I use to prevent this?” the short answer is that fastener failure is rarely about the screw alone. It is a system issue involving the metallic coating on the screw, the cut edge of the PPGI […]
Read →How to Ensure PPGI Color Consistency Across Batches
Color mismatch between PPGI coil batches is one of the most frequent and costly complaints in the prepainted steel supply chain. The short answer to preventing it is this: you must move beyond naming a RAL number and instead specify a measurable color tolerance, typically expressed as ΔE, along with a defined approval process for […]
Read →Importing PPGI Coils into the Philippines: Regulations and Buying Tips
To import prepainted galvanized iron (PPGI) coils into the Philippines, you must comply with the Bureau of Customs (BOC) import procedures, secure the required product-specific certifications from the Department of Trade and Industry (DTI) and the Bureau of Philippine Standards (BPS), and prepare a complete set of commercial and shipping documents. This article explains the […]
Read →How Galvanized Substrate Quality Affects PPGI Coating Adhesion
The quality of the galvanized substrate is the single most critical factor determining whether a PPGI (pre-painted galvanized iron) coating will adhere properly and perform over time. If the zinc layer is inconsistent, contaminated, or poorly treated, even the most advanced paint system will fail through peeling, blistering, or corrosion creep. For importers and roll […]
Read →GI Coil vs. PPGI Coil: Cost, Performance, and When to Use Each
For procurement managers and roll formers, the decision between Galvanized (GI) and Pre-Painted Galvanized (PPGI) steel coil is not simply a matter of aesthetics. The core cost and performance difference is that GI coil offers a bare zinc coating applied after steel production, while PPGI coil adds a factory-applied paint system on top of that […]
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PPGL vs PPGI: Which Prepainted Steel Coil Performs Better?
When sourcing prepainted steel coils, the core question is not which coating is “better” in absolute terms, but which metallic substrate—galvalume (PPGL) or hot-dip galvanized (PPGI)—matches your application’s mechanical, corrosion, and budgetary constraints. In short: PPGL offers superior corrosion resistance and heat reflectivity in most exterior environments, while PPGI provides better formability, edge protection, and […]
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