Technical and procurement guide · 13 August 2026
Galvanized Coating Weight Designations: G60, G90 and Z275
G60 and G90 belong to ASTM A653/A653M; Z275 belongs to EN 10346. All describe total both-sides coating mass within their own systems, but designation conversion alone does not establish exact product equivalence, thickness distribution, substrate grade or corrosion life.
Answer first
The short answer
G60 and G90 belong to ASTM A653/A653M; Z275 belongs to EN 10346. All describe total both-sides coating mass within their own systems, but designation conversion alone does not establish exact product equivalence, thickness distribution, substrate grade or corrosion life.
Technical explanation
What controls the result
Always retain the governing standard and edition beside the designation.
Coating test basis and local distribution matter to acceptance.
Coating class does not specify substrate mechanics, surface treatment or fabrication quality.
Decision table
Designation-system boundaries
| Decision factor | First option | Second option |
|---|---|---|
| G60 | ASTM A653/A653M | Keep ASTM order rules |
| G90 | ASTM A653/A653M | Higher class than G60 in same system |
| Z275 | EN 10346 | Keep EN substrate and test rules |
Use this table for screening, not as a substitute for the project specification, design review or certificate.
Selection workflow
From service to an auditable specification
Start with the governing product and design standards, not a familiar trade name.
Define environment, pressure or load, fabrication, design life and failure consequence.
Compare the exact grade, condition, product form, dimensions and inspection route.
Release the order only after deviations and substitutions receive written approval.
Limitations
What this guide cannot decide alone
- Typical values and designation comparisons are screening aids; the ordered edition and certificate control acceptance.
- No comparison proves universal suitability, interchangeability or service life without project review.
Procurement checklist
Make supplier offers comparable
Governing product standard, edition, grade and ordered condition
Product form, dimensions, tolerances and quantity
Service environment, design code and fabrication route
Surface or coating, inspection, certificate and traceability
Packing, marking, destination and delivery requirement
Evidence
Sources and review
Project specifications and the current governing editions supersede this general guide.
· Scope reviewed 13 August 2026
· Scope reviewed 13 August 2026
· Scope reviewed 13 August 2026
· Scope reviewed 13 August 2026
Attributable sourcing request
Turn the comparison into a quote-ready specification
Send the governing standard, dimensions, quantity, service environment, inspection and destination requirements.