GSM describes finished weight per square metre, not guaranteed life or complete strength.
Buying principle: define application, destination, exposure, handling and target life before comparing price.
80 GSM
May suit light or temporary programs where compact packing matters; verify weave, coating and reinforcement.
120 GSM
Can support many general wholesale programs, subject to duty, climate, load and handling.
180 GSM
More weight can add body, but yarn, lamination, seams, edges and fixing points remain critical.