Difference between 120 GSM and 275 GSM galvanised steel sheet?

The difference between a 120 GSM and a 275 GSM galvanized steel sheet lies in their respective coating weights. GSM stands for grams per square meter, indicating the amount of zinc coating on the steel sheet. A 120 GSM sheet has a lighter coating, making it more suitable for applications where weight is a concern, while a 275 GSM sheet has a heavier coating, providing better corrosion resistance and durability for more demanding environments. The choice between the two would depend on the specific requirements of the project in terms of corrosion protection and structural integrity.