Thickness, or calliper, is an important characteristic of paper, board and tissue and can be measured on single or multiple plies. Results are typically reported in μm (microns). Bulking thickness is the thickness of a single sheet calculated from measurements taken across several sheets.

Smithers is ISO 17025 accredited for thickness and bulk thickness testing of paper to BS EN ISO 534 and ISO 534. Paper thickness testing is also included in Smithers' Paper Proficiency Service 

Tissue thickness is measured in accordance with BS 7387 and BS EN 12625-3, while corrugated board thickness is measured in accordance with BS 4817.

Compressibility index is calculated from the grammage and bulking thickness of the paper sheet. Smithers determines compressibility index in accordance with BS 7387, with results expressed in µm.

Apparent sheet and bulk density can also be calculated from the corresponding thickness and grammage measurements.

Talk to our experts about your paper, board or tissue material and the physical properties you need to evaluate.

Download a brochure for more information:

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