There can be no conversion. A micron is a measure of length (thickness) while gsm (grams per square metre) is a measure of mass per unit area. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempt at comparisons or conversions between the two are fundamentally flawed.
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bs of the paperx1000/gsm of the paper=bf of the paper
140 gsm finish gsm
please convert 140 microns to GSM
To convert microns to grams per square meter (GSM), you can use the general conversion factor where 1 micron is approximately equal to 1.48 GSM for paper. Therefore, 50 microns would be roughly 74 GSM (50 microns × 1.48 GSM/micron). Keep in mind that this is an approximation and actual GSM can vary depending on the material.
easy formula for calculate gsm as below, GSM= (EPI/Warp count*1.1)+(PPI/Weft count*1.04)*23.5