Specification:

Dimensions: 8.25x11.25 inch

Thickness: 0.238mm

Number of sheets per pack: 100

Why we use millimeters to describe the thickness of Rock Paper instead of pounds?

Typically, when paper thickness is determined it’s weighed in a ream of 500 sheets that has been cut into a predetermined size based on the paper type.  The more paper weighs the thicker it is.  However, this way of measuring does not work for Rock Paper because in general Rock Paper is heavier (remember it’s made from rocks).

To test our theory we ran a small experiment.

Experiment results:

1.     We cut a thin sheet of Rock Paper to match the size of a standard sheet of Origami paper.  Both Sheets are 6x6 inches square.

2.     We measured the thickness of each sheet

a.     Rock Paper was 0.076mm thick

b.     Origami paper was 0.078mm thick

3.     We weighed each sheet individually

a.     Rock Paper was 0.075oz

b.     Origami paper was 0.041oz 

The results show us that even though the sheet of Rock Paper was 0.002mm thinner it still weighed more than the standard sheet of Origami paper by 0.034 ounces.  This data shows that using pounds to measure the thickness of rock paper will give confusing numbers.

For good measure, we did another experiment using 110lb cardstock and Rock Paper that had a similar thickness.

Experiment results:

1.     We cut a thick sheet of Rock Paper and a sheet of 110lb cardstock to 6x6 inches square.

2.     We measured the thickness of each sheet

a.     Rock Paper was 0.225mm thick

b.    Cardstock was 0.239mm thick

3.     We weighed each sheet individually

a.     Rock Paper was 0.16oz

b.    Cardstock was 0.16oz

The results were interesting in that both the thick Rock Paper and cardstock weighed exactly the same.  However, if you look at the thicknesses, the cardstock was slightly thicker still proving the point that Rock Paper in general is heavier than fiber-based papers. 

Don’t let the heaviness intimidate you.  Rock Paper has the same usability qualities as its fiber-based counterparts, plus it’s archival and waterproof!