G90 is a hot-dip galvanized steel sheet, protected by a zinc coating that provides enhanced corrosion resistance. Fiber laser cut, it delivers sharp edges and repeatable precision for exterior, light marine, and industrial applications: roofing/flashing, HVAC, automotive body panels, light chassis, cladding, and signage.
The G90 coating (≈ Z275 metric) combines durability, attractive appearance, and ease of fabrication. Its formability and weldability simplify assembly; the zinc's cathodic protection extends service life, reducing maintenance and replacement needs.
Key Characteristics
Coating: Hot-dip galvanizing with G90 zinc mass (≈ Z275) for high outdoor corrosion resistance.
Finish: Zinc-coated surface with variable "spangle" appearance depending on batch; can be painted (zinc-compatible primer) or left natural.
Process: Fiber laser cutting and/or CNC machining for precise holes, counterbores, and taps (typical tolerance ±0.005").
Formability/weldability: Clean bends; welding possible (MIG/TIG/spot)—plan for local preparation and adequate ventilation.
Cut edges and holes: Cut edges expose the base steel; the zinc's sacrificial protection limits rust, but primer/paint on edges is recommended in aggressive environments.
Maintenance/durability: Excellent weather resistance; longevity reduces replacements and environmental impact.
Galvanized or galvanneal?
G90 is shiny and can be left bare outdoors; galvanneal steel is its annealed version with a matte finish, designed to be painted and welded cleanly. Part left bare → G90; part painted or welded → galvanneal.
Common Applications
Roofing, flashing, cladding, and siding.
Body panels, chassis components, automotive and industrial equipment parts.
HVAC: ducts, hoods, supports, and accessories.
Agricultural equipment, light marine environments, and outdoor structures.
Highway guardrails, cladding, signage, and architectural projects.
Design Best Practices
Plan for small internal radii to limit zinc micro-cracking during bending.
Protect edges and holes (primer/paint) when exposure is severe (salts, coastal, freeze/thaw cycles).
Galvanically isolate when G90 contacts dissimilar metals (e.g., copper, aluminum) in humid environments.
Assemblies: welding, rivets, screws; hardware insertion (PEM), bending, and tapping available per project.