PPGI and PPGL differ in the metallic coating beneath the paint. PPGI uses zinc-coated galvanized steel; PPGL uses aluminium-zinc alloy coated steel. Both have an organic paint system. For roofing, compare the complete specification rather than assuming one abbreviation guarantees a longer life.
For available dimensions, paint options and an order enquiry, see ChinaCNU PPGI coil specifications and PPGL coil.
PPGI and PPGL: Specification Comparison
| Buying decision | PPGI | PPGL |
|---|---|---|
| Metallic coating | Zinc on steel | Aluminium-zinc alloy on steel |
| Coating designation | Specify the required zinc coating designation and test basis | Specify the required aluminium-zinc coating designation and test basis |
| Paint | Specify primer, top coat, back coat, colour and gloss | Specify primer, top coat, back coat, colour and gloss |
| Forming | Confirm steel grade, thickness and coating flexibility for the profile | Confirm steel grade, thickness and coating flexibility for the profile |
| Exposure | Check the full system against the actual environment | Check the full system against the actual environment |
| Price | Obtain a dated quotation for a defined specification | Obtain a quotation on the same gauge, paint, quantity and delivery basis |
A Z coating designation and an AZ designation describe different coating systems. Do not treat matching numbers as proof of equivalent performance.
How to Choose for a Roofing Project
- Identify the exposure. Tell the supplier about marine salts, industrial emissions, condensation, nearby agricultural activity and the maintenance conditions.
- Confirm the roof specification. State the profile, spans, gauge, grade, fasteners and any project requirements. Structural suitability must be checked for the actual roof.
- Specify the entire coating system. Include metallic coating, paint chemistry, primer, top and back film thickness, colour and gloss.
- Check forming and installation. Agree bend requirements, sample evaluation, cut-edge treatment, compatible accessories and handling instructions.
- Compare evidence. Request relevant coating-system documentation and an order-specific inspection plan.
Why a Fixed Lifespan or Price Comparison Can Mislead
Statements such as “PPGL lasts twice as long” omit important variables. Coating mass, formulation, surface preparation, cut edges, exposure and maintenance all affect the result. Require evidence relevant to the proposed specification; a generic lifetime number is not a warranty.
Likewise, a price per tonne is only comparable when grade, thickness basis, tolerance, coating, quantity, packing, Incoterm and quotation date are aligned. Ask whether freight and destination charges are included.
Information to Send with Your Enquiry
- Roofing application, destination and environmental conditions
- PPGI or PPGL substrate requirement and grade
- Thickness and measurement basis, width and tolerances
- Metallic coating and complete paint specification
- Colour / gloss, coil weight and equipment limits
- Quantity, packing, inspection, destination port and delivery terms
ChinaCNU’s factory is in Boxing County, Binzhou, Shandong; its export office is in Qingdao. Review factory and dispatch photographs, certificate scope and status, and the PPGI quotation checklist before requesting an order-specific offer.
Frequently Asked Questions
Is PPGL always better than PPGI for roofing?
No universal choice follows from the abbreviation. Select the complete substrate and paint system for the roof’s exposure, forming process, project specification and maintenance conditions.
Can PPGI and PPGL use the same colour?
They can be specified to the same colour reference, but the actual appearance also depends on the paint system, gloss, texture and production batch. Approve a physical sample and an agreed colour tolerance.
How do I compare quotations fairly?
Use the same thickness basis, grade requirements, dimensions, paint specification, quantity, packing and delivery terms. Record the different metallic coatings explicitly and compare their suitability as well as their prices.
Related Products from ChinaCNU Steel
View PPGI coil specifications · View PPGL coil · Send a roofing coil enquiry