news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
PPGI Coil Inspection and Test Certificates on Arrival
When a PPGI coil shipment arrives, your QC team should first reconcile the mill certificate and test certificates against the purchase order, then run physical checks on coating mass or thickness, total and paint thickness, adhesion, bend or T-bend, color, and gloss. Record every result with coil ID, test method, instrument, sample location, and pass/fail […]
Read →PPGI Coil Thickness, Width and Camber Tolerances
On most PPGI orders, the normal commercial expectation is a thickness tolerance within roughly ±0.02 mm to ±0.05 mm depending on nominal gauge and the standard applied, a width tolerance of about 0/+3 mm to +5 mm for slit-to-width coil, camber under about 5 mm over any 2,000 mm of length for well-controlled coil, and […]
Read →PPGI Back Coating Selection for Sandwich Panels
Yes — the back coating on your PPGI facer can affect foam adhesion, panel flatness and delamination risk. The back coat is the surface that bonds to PU, PIR or rock wool core chemistry, so it is a functional interface, not a cosmetic layer. To specify it, state the core chemistry, the facing orientation, the […]
Read →PPGI Roofing Cut Edge Corrosion and Edge Protection
Rust starting at the cut edges of a PPGI roof is usually not a paint defect in the coil itself. A cut edge, a drilled hole or a saw-cut sheet end exposes bare steel and the metallic coating, and that exposed metal becomes the anode of a small galvanic cell. Whether it stays a cosmetic […]
Read →PPGI Coil Zinc Coating Mass Selection by Environment
For most coastal or industrial sites, a prepainted galvanized (PPGI) coil with a zinc coating mass of Z275 (275 g/m² total, both sides) is the common starting point, while Z100–Z180 is usually adequate for mild inland or sheltered indoor service. But zinc mass alone does not decide performance: if the site combines chloride-laden air, persistent […]
Read →PPGI Coil Coating Thickness: Micron vs GSM Explained
If your supplier quotes paint coating in g/m² (GSM) and your engineer specifies microns, you are comparing two ways of describing the same dry paint film: GSM is the mass of dry paint per unit area, and micron is the thickness of that film. You can convert between them if you know the paint’s dry […]
Read →PPGI Paint Peeling Causes: From Substrate to Curing Oven
If paint is flaking off your PPGI coil in sheets after profiling, the fastest way to find the fault is to treat the coil, the roll forming line and site handling as three separate suspects and eliminate them one by one. Sheet-like peeling — where the film lifts in large, coherent flakes rather than chalking […]
Read →PPGI Coil MTC and Third Party Inspection Scope
An MTC and an inspection report protect you only within the limits of what they measure, when they were measured, and who witnessed the measurement. A mill test certificate (MTC) is a declaration of chemical composition and mechanical properties for the coil or heat it references; a third-party inspection report is evidence that a named […]
Read →PPGI Coil Colour and Gloss Consistency: Delta E Batch Control
To keep panels from different PPGI batches looking the same on one roof, set a realistic colour tolerance of roughly ΔE ≤ 1.5–2.0 for adjacent batches under a defined illuminant and measurement geometry, pair it with a gloss range (for example ±5 units around a target such as 30–40 GU at 60°) rather than a […]
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PPGI vs PPGL Roof Cladding for Hot, Humid and Coastal Sites
For a hot coastal roofing project, prepainted galvalume (PPGL) is usually the better starting point than prepainted galvanized (PPGI) — but only if the full coating build, paint system and cut-edge treatment are specified for the environment. The honest answer to “is PPGL worth the premium?” is: it depends on how close the building is […]
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