GSM stands for grams per square metre and it is one of the main defining characteristics of paper along with finish and grade. GSM refers to the density of the paper. A paper with a higher GSM will be more dense than one with a lower GSM one and therefore will lead to a heavier finished product.
It is important to remember that other factors can affect the appearance and feel of a paper. These include properties such as pulp content, texture and finish. Ironically sometimes a lighter paper can bulk up more after printing and appear thicker than a heavier one due to the effects of the curing process. Some more information about paper types can be found HERE.
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