I’ve been looking for strong but lightweight packaging options in particular for larger prints, my largest prints are currently 60 x 80cm. Over the past few years I’ve used many different options, including bubble wrap bags, and all of the cardboard and bubble wrap that has come into our home, I strongly advise recycling packaging as often as you can if you have the storage space to do so.
Greyboard seems like an excellent solution as a substrate to strap on either side of a print, I’m going to give it a go. I am going to try 2mm, 1,260 gsm and see how that feels as a protective option, I’ll probably wrap that in something, or just tape it up the edges… I’ll come back to this to update next time I send something out, note that my prints are in cello packs to give them a waterproof protection prior to packaging.
I found this extremely useful chart from deprintedbox.com on conversion from grammage to mm.
There is a formula to calculate the thickness of the greyboard simply as below.
Thickness (mm) = Grammage (gsm) * 1.55 / 1000
For example, if the grammage is 1290gsm, then
Thickness (mm) = 1290 * 1.55 / 1000 = 2 mm
Below is a conversion table for the common greyboard thickness and grammage that are used for the cardboard gift boxes, rigid boxes and set up boxes.