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Depends on the density of the product.
300gsm in stationary/printing terms is around as thick as cereal box card.
To convert grams per square meter (gsm) to microns, you can use the density of the material. For paper, a common approximation is that 1 gsm is roughly equivalent to 1 micron in thickness. Therefore, to convert 30 gsm to microns, you can say it is approximately 30 microns thick, assuming the density is similar to that of standard paper. However, if the material's density differs, you would need to adjust the calculation accordingly.
140 gsm finish gsm
85% of 330 = 85% * 330 = 0.85 * 330 = 280.5