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Card thickness (caliper) is measured in microns (1000 microns = 1 mm)
The reason you find a weight measurement gsm (grammes per square meter) is because paper and card is sold by the metric tonne to suppliers in Europe, and so is priced to us in that format too.
Card is sold using both caliper and weight to give the buyer more information. Commercially
available paper/card for printing usually starts at around 200 microns and finishes
at around 500 microns. Sheets of this thickness are then laminated together to make
thicker card. Card used to be described in terms of how many sheets laminated together
it is. A 230 micron card may be 180 gsm and known as '3-
AIthough weight and thickness usually correspond, it is not always the case. For
instance, embossed card with a raised design may be thicker because of the embossing,
but not necessarily heavier. So if you want a sturdy card, look at the gsms measurement
rather than the thickness.
Thick Card suitable for craft knife use, mounting, and framing.
Card Weight & Thickness