G90 galvanized ensures a strong, durable coating that resists corrosion. With a coating of 0.90 ounces of zinc per square foot, it offers a robust protection that stands up well to harsh environments.
What is G90 Galvanized?
G90 refers to a specific type of galvanized coating applied to steel. This coating contains 0.90 ounces of zinc per square foot of steel. The zinc layer adds protection against rust and corrosion, making it a popular choice for outdoor and industrial applications.
Meaning of “G90”
– “G” stands for galvanized.
– “90” refers to the total weight of the zinc coating on both sides of the steel sheet, measured in ounces per square foot. Specifically, G90 means that the coating weight is 0.90 ounces per square foot (oz/ft²).
In metric units, the G90 coating weight translates to approximately 275 grams per square meter (g/m²) of zinc coating.
Comparison with Other Galvanized Grades
| Grade | Zinc Coating (oz/ft²) |
|---|---|
| G40 | 0.40 |
| G60 | 0.60 |
| G90 | 0.90 |
| G140 | 1.40 |
Grades like G60 and G140 offer different levels of protection. G60 has 0.60 ounces of zinc per square foot, providing less protection than G90. G140, on the other hand, offers more protection with 1.40 ounces of zinc.
Material Composition
The G90 coating is primarily zinc. The zinc creates a barrier against moisture, which can cause rust. Over time, if the zinc is scratched or damaged, it will also “sacrifice” itself to protect the steel underneath.
Thickness
For G90, the zinc adds around 1.6 mils (0.0016 inches, or 42 microns) to the thickness of the sheet. That’s 0.0008 inches (21 microns) on each side.
Relevant Standards
G90 galvanizing must meet specific standards:
- ASTM A653: This standard covers galvanized steel sheet specifications. It ensures the coating weight, adhesion, and durability meet industry requirements.
By sticking to these standards, manufacturers ensure high-quality material that meets consumers’ needs for durability and protection.
Corrosion Resistance
G90 galvanizing offers strong corrosion resistance. This is due to the zinc coating that acts as a protective barrier.
Protection Mechanism
The zinc layer helps keep rust away from the metal. This is because zinc reacts with the environment first, which sacrifices itself to protect the steel.
Longevity and Durability
A typical G90 coating is about 0.9 ounces of zinc per square foot. This means it offers robust protection, even in tough environments like coastal areas. This protection lasts a long time, reducing the need for maintenance.
Applications of G90 Galvanized
Construction Industry
Structural Steel: G90 galvanizing is highly valued in construction, particularly for structural steel. The robust zinc coating, with its 0.9 oz/ft² weight, offers superior protection against corrosion. This makes G90 ideal for use in environments where steel structures are exposed to moisture, which helps extend their lifespan.
Roofing and Siding: G90 galvanized steel is also widely used in roofing and siding. Its thick zinc layer shields the material from rust and weathering, which is crucial for buildings in coastal or humid regions. This protection ensures that roofs and sidings remain durable and low-maintenance over time.
Other Industries
Agriculture: G90 galvanized steel is used in agricultural equipment and structures. Farm machinery, fencing, and storage units benefit from the corrosion resistance of G90, which helps them withstand outdoor conditions and reduces the need for frequent repairs.
Electrical and Utility: In the electrical and utility sectors, G90 galvanizing protects components like utility poles, transmission towers, and electrical housings. This zinc coating ensures they resist the elements, providing reliable performance and longevity even in demanding environments.
Conclusion
G90 galvanizing provides a thicker, more durable zinc coating compared to G60. This makes it especially suitable for environments with high corrosion risks, like coastal areas.
Key Takeaways:
- Thicker Zinc Coating: G90 uses 0.9 ounces of zinc per square foot.
- Better Corrosion Protection: Ideal for harsh environments.
- Longevity: Extends the life of metal structures.
