news — from the mill.
Production notes, industry updates, and a little colour on what we’re making this month.
PPGI Coil Price Drivers and Total Landed Cost
The price of PPGI coil is influenced mainly by substrate type and thickness, metallic coating weight, paint system, coil dimensions, order quantity, mill location and freight, payment terms, and the date of quotation; the true total landed cost adds freight, insurance, duties, port and inland charges, handling, storage, financing, and quality-related risk to the ex-works […]
Read →PPGI Coil Selection for Middle East High Heat and Solar Radiation
For a buyer in the Middle East, the most important PPGI coil features for extreme heat and solar radiation are: a heavier metallic coating (usually zinc or zinc-aluminium) for corrosion reserve, a paint system with proven UV and colour stability at high surface temperatures, a substrate grade and temper suited to your roll forming and […]
Read →GI Coil Skin Pass Roughness Effect on PPGI Quality
There is no single universal roughness value that guarantees a good prepainted finish. For many continuous coil-coating lines, a skin-passed galvanized (GI) substrate is specified in the region of Ra 0.8–1.5 µm with a reasonably uniform, non-directional profile, but the ideal figure is the one your coater can wet out consistently while still giving the […]
Read →Galvanized Substrate Spangle Effect on PPGI Paint Adhesion
Does the spangle size of the galvanized substrate impact the final quality of a PPGI coil? Yes — but not in the simple way many buyers assume. Spangle is the visible crystalline zinc grain pattern formed during hot-dip galvanizing. On a GI coil used as a substrate for PPGI coil, spangle affects three things that […]
Read →
PPGI vs PPGL Price and Performance Tradeoffs
Is the higher cost of PPGL justified by better corrosion resistance compared to PPGI? Sometimes yes, often no — and the deciding factor is your application environment and service life requirement, not the coating name alone. PPGL (prepainted galvalume) usually carries a higher base-metal cost than PPGI (prepainted galvanized) because the aluminium-zinc metallic coating costs […]
Read →PPGL vs PPGI for Roofing and Wall Cladding
For most exterior roofing and wall cladding exposed to rain, humidity, salt or industrial atmosphere, PPGL (prepainted galvalume / zinc-aluminium coated steel) is usually the stronger default choice, because its aluminium-rich metallic coating tends to resist atmospheric corrosion better than a plain zinc coating of similar mass. Choose PPGI (prepainted galvanized steel) when the environment […]
Read →PPGI Coil Edge Damage: How to Document and File a Shipping Claim
If your PPGI coil shipment arrives with edge damage, the practical sequence is: stop unloading, photograph and video the container or truck before touching the coils, record the damage on the carrier’s delivery receipt, notify your seller and freight forwarder in writing within the notice period stated in your contract, then commission an independent survey […]
Read →PPGI Coil Defects: Blistering, Chalking, Delamination
Blistering, chalking, and delamination on PPGI sheets usually trace back to one of five root causes: moisture or contamination trapped under the paint film, an under-cured or over-cured coating, an inadequate pretreatment or primer layer, a paint system mismatched to the service environment, or mechanical damage during slitting, forming, and installation. Because these defects often […]
Read →PPGI Coil for Coastal and High-UV Environments
For a building in a coastal or high-UV area, the short answer is: specify a heavier metallic coating first, then choose a paint system designed for UV and salt exposure — typically a polyester (SMP or HDP) or PVDF-based topcoat at a nominal dry film thickness of about 20–25 µm for the primer and topcoat […]
Read →PPGI Coil for Sandwich Panel Core Adhesion Requirements
The PPGI coil properties most critical for good adhesion in PIR and EPS sandwich panels are the back-coat (reverse-side) paint system, the surface cleanliness and pretreatment of the substrate, the metallic coating type and mass, and the coil’s flatness, temper and surface topography — not the decorative top coat. Foam cores bond to the reverse […]
Read →