Base paper Paper that is treated or enhanced in some way by the manufacturer (e.g. by means of coating or impregnation).
Basis weight Classification for various "paper strengths". It is expressed as the weight for 1 square metre of the paper (= gsm).
Book printing paper Paper for producing books ("printed matter"). Volume is especially important (e.g. 1.5 times, 1.75 times, double) (bulky printing paper).
Breaking length The greater the breaking length, which can be tested by appropriate measuring equipment, the greater the paper strength. It is expressed as the theoretical limiting length of a strip of paper of uniform width beyond which, if the strip were suspended by one end, it could break under its own weight.
Brightness A very decisive criterion for the quality assessment of paper. Brightness (white content) is measured in comparison with magnesium oxide, whose reflective strength for white light is rated at 100%.
Bursting strength A quality feature that indicates what resistance a paper demonstrates to bursting. It is expressed in kPa for a defined test area.