Corrugated board is the dominant transport packaging material. All corrugated board blanks have to pass converting machines in order to produce packaging. The corrugated board converting process should be precise to avoid waste and machine stops. There are standards existing that state tolerances for the corrugated board converting process. These tolerances can be set for corrugated board properties like warp and dimensions or tolerances to be achieved for the ready packaging. The standards are issued among others by FEFCO, GIFCO, VDW, and SUW (The International Development Group of Corrugated Board), but also by some large brand owners. A comparison of tolerances mentioned in the most important standards was conducted. Further actual tolerances of corrugated board and corrugated board packages converted in several corrugated board plants and used at the brand owners were investigated. At corrugated board plants and brand owners the ambient temperature and humidity were measured. Also the temperature and humidity in the corrugated board stacks and the warp of the sheets were investigated. The runnability in the converting machines was evaluated by machine drivers. Some of these results will be shown. Furthermore thickness, folding strength of creases and misalignment, fishtailing, gap of manufactures joint and width and length of folded blanks of slotted boxes were determined. The results indicate that stricter tolerances for corrugated board are possible. The results of the plant trials will be used to propose a new SUW standard with new tolerance levels e.g. for warp and dimensions of the corrugated board sheets and packages. The new tolerances will be discussed within the corrugated board branch, converting machine suppliers and users of corrugated board. New stricter tolerances for corrugated board packaging in the converting process contribute to a better competitiveness of this renewable and sustainable packaging material in the future.