Blue PPGI Roofing Sheet: Vibrant Aesthetics with Reliable Z30 Galvanized ProtectionOur Blue PPGI

Roofing Sheets are engineered to provide a striking architectural finish combined with the fundamental protection of hot-dip galvanized steel. Specifically utilizing a Z30 ($30g/m^2$) zinc-coated substrate, these sheets are the optimal choice for cost-sensitive projects such as temporary housing, interior partitions, and agricultural sheds in mild environments.
Bomis Steel combines high-precision color-matching technology with a durable paint system to deliver a roofing solution that is as reliable as it is visually appealing.
Z30 Substrate: Optimized for Cost-EfficiencyThe “Z30” designation is a strategic choice for specific engineering needs. Under the JIS G3312 or EN 10346 standards, this substrate offers:Targeted Corrosion Resistance: The $30g/m^2$ zinc layer provides essential sacrificial protection for the steel core, preventing rapid oxidation in controlled atmospheric conditions.Superior Lightweight Profile: By optimizing the zinc mass, these sheets remain lightweight, reducing the structural load on building frames and lowering overall logistics costs.

Precision Corrugation & Durability

• Anti-Cracking Technology: Despite being a prepainted product, our sheets undergo precision corrugation that maintains a 0T-3T bend rating, ensuring no paint peeling or micro-cracking at the ribs of the waves.

• Water Drainage Design: The profile is engineered to facilitate rapid water runoff, preventing moisture accumulation and extending the lifespan of the Z30 substrate.

• Easy Installation: These sheets are designed for quick overlap and secure fastening, significantly reducing onsite labor time.

Technical Specifications Summary

Feature	Specification	Compliance Standard
Product Type	Prepainted Galvanized (PPGI)	JIS G3312 / EN 10346
Color	RAL 5015 / RAL 5012 / Custom Blue	High UV Resistance
Zinc Coating	Z30 ($30g/m^2$)	Hot-Dip Galvanizing
Thickness Range	0.12mm – 0.50mm	Precision Micrometric
Paint Finish	PE / SMP / Matte	$\Delta E \leq 1.0$ Consistency
Corrugation Profile	Circular / Trapezoidal / IBR	High Rigidity

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Frequently Asked Questions

 

1. What does “Z30” mean for a Blue PPGI roofing sheet?

The Z30 designation refers to the weight of the zinc coating on the base steel, which is $30g/m^2$ (total on both sides). This is a light-duty galvanized substrate designed for cost-efficiency. It provides sufficient sacrificial protection for the steel core in mild climates or indoor applications, making it the most economical choice for projects where budget is the primary consideration.

2. Is the blue color on the PPGI sheet resistant to fading?

Yes. Our blue PPGI sheets utilize high-quality Polyester (PE) or SMP paints with specialized UV-resistant pigments. While all color-coated steel will eventually experience some weathering, our coating process ensures high color retention (with a low $\Delta E$ value). For projects in areas with extreme sunlight, we recommend choosing our Matt Blue or HDP options for even greater resistance to chalking and fading.

3. Where is Z30 Blue PPGI roofing most commonly used?

Due to its lightweight and cost-effective nature, Z30 grade PPGI is ideal for:Temporary site housing and worker dormitories.Interior decorative wall panels or partitions.Agricultural sheds and warehouses in low-corrosive, non-coastal environments.Projects requiring a vibrant aesthetic on a limited budget.

4. Can 0.12mm – 0.15mm thin blue roofing sheets withstand heavy rain?

Despite being thin, our sheets are produced with high-tensile base steel. When roll-formed into a corrugated or trapezoidal profile, the structural rigidity increases significantly. This “light but strong” profile allows the sheets to handle standard rain and wind loads effectively while reducing the overall weight on the building’s support structure.

5. Does the paint crack when the Blue PPGI sheet is bent or corrugated?

No. Our Blue PPGI coils undergo a rigorous T-bend test (typically 0T-3T). The paint system is formulated with high flexibility to ensure that the coating remains perfectly adhered to the Z30 zinc layer without cracking or peeling, even at the sharpest points of the roofing wave.