8 1/2 x 11 Chipboard Pad (.022 Thick) 960/CaseChipboard sheets are commonly used to provide added protection when stacking paper in boxes, or as the stiff backing seen on pads of legal or notebook paper. Our tough chipboard constructed from . 022 paperboard board is available as sheets or pads in different sizes and quantities according to your needs. They are also used for strengthening envelopes or mailers.