Oz/yd2 to g/m2

Tradicional (cellulose) and cotton paper thickness difference GSM (g/m^2)Traditional Premium PapersPure Cotton Papers4300.8 mm (0.03″)4850.65 mm (0.025″)5001 mm (0.04″)5400.75 mm (0.03″)All you need to know about cardstock paper weight and thickness www.elegantepress.com › blog › all-you-need-to-know-about-card-stock-p…

The ratio of 60 to 180 GSM is 1:3, but the ratio of 0.08 to 0.19 mm is significantly different at 1:2.375. It is nearly impossible to compare measurements of different types of paper accurately. The GSM of card stock, for example, can’t be converted to MM by comparing it to bond paper .

A rule-of-thumb then is to multiply specific density values by 1000 to obtain the weight of a sheet that is one millimeter in thickness . As an example, the specific density of PP ranges from 0.855 g/cc to 0.946 g/cc. A one millimeter thick layer of PP would then have an areal weight between 855 gsm and 946 gsm.

In short, GSM stands for Grams per Square Meter . There are thousands of varieties of paper and board which have a wide range of properties. The use of the term GSM is a good way for paper manufacturers and printers to identify them. The higher the GSM number, the heavier the paper.