| The mass per unit area of paper / card is measured in grams per square metre (g/m2). This is called grammage, although most people refer to it as weight. Office copier paper is usually 80g/m2 (80gsm), A4 in size and ordered in reams (packets) of 500 sheets. However, card thickness (sometimes called ‘caliper’) is generally measured in micrometers (microns). |
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| 1000 microns = 1mm |
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