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None, since there can be no conversion. gsm (grams per square metre is a measure of mass per unit area - a kind of density whereas a micron is a measure of length. 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. A material with high density would be much thinner (fewer microns) than one with low density.

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∙ 9y ago

What else can I help you with?