UNI EN 643:2014
Group 4: Kraft grades
Group 4 includes all those papers, cardboard trimmings, used Kraft, Kraft bags, of Kraft quality.
4.01 New shavings of corrugated board

Shavings of corrugated board, with liners of kraft or testliner.

4.02 Used corrugated kraft

Used boxes of corrugated board, with kraft liners only, the fluting made from chemical or thermo-chemical pulp.

4.06 Used kraft

Used kraft paper and board of a natural or white shade.

4.07 New kraft

Shavings and other new kraft paper and board of a natural shade.