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- Steel base with metallic coating on both sides
- Conversion coating, primer, finish and backing coats
- Grades G300 to G550
- Coating class chosen for the site environment
Eight layers of protection
Pre-painted sheet is a layered product. The steel base carries a metallic alloy coating – zinc (galvanized) or zinc-aluminium – on both faces; a conversion coating bonds the paint, a primer adds protection, and a polyester finish coat gives colour and UV resistance on the top face with a backing coat underneath.
Choosing the coating
- Inland and mild environments: AZ100–AZ150 or Z180–Z275 with standard polyester paint
- Coastal and industrial environments: heavier metallic coating and higher-durability paint systems
- Severe marine or chemical exposure: special coatings or alternative materials on request
See metallic-coated sheet and paint and coating systems for more detail.
Steel grades
| Grade | Minimum yield | Typical use |
|---|---|---|
| G300 | 300 MPa | Roll-curved and crimped sheets, flashings |
| G450 | 450 MPa | Standing seam, decking, purlins |
| G550 | 550 MPa | Clip-lock and trapezoidal roof and wall sheets |
Standards and requirements by market
Codes World Steel designs, fabricates and documents this product to – and the key geometric and load requirements in each market.
United States
- ASTM A653 / A792Galvanized / 55 % Al-Zn coated sheet
- ASTM A755Coil-coated (pre-painted) metallic-coated sheet
Australia / NZ
- AS 1397Metallic-coated steel sheet – G300 to G550, Z / AZ coatings
- AS/NZS 2728Pre-finished / pre-painted sheet
Europe
- EN 10346Continuously hot-dip coated steel flat products
- EN 10169Organic coated (pre-painted) steel flat products
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Finishes
| Finish | Standards / notes |
|---|---|
| Zinc-aluminium (AZ) coated | AZ100–AZ150 · AS 1397 / ASTM A792 / EN 10346 |
| Galvanized (Z) | Z180–Z275 · AS 1397 / ASTM A653 / EN 10346 |
| Pre-painted | Polyester or SMP paint system on AZ / Z substrate · AS/NZS 2728 / ASTM A755 / EN 10169 |
| Colours | Standard colour range; special colours on minimum order quantity |
Frequently asked questions
What is the difference between Z and AZ coatings?
Z is a pure zinc coating (galvanized); AZ is a zinc-aluminium alloy coating that usually lasts longer for the same coating mass in roofing exposure.
IAS AC472