Calculation method
A detailed example on a possible calculation method for HP 12 is taken from the UK Guidance and presented in the following. A substance is assigned EUH029, EUH031 or EUH032 if it is capable of releasing an acute toxic gas (34) when water or acid is added. If a waste contains a substance assigned EUH029, EUH031 or EUH032, it is possible to calculate the limiting concentration of the substance in the waste that would make it hazardous by HP 12. An example of how to do the calculation is given below in Box 4 (35). Threshold limits derived from the calculations for some EUH029, EUH031 or EUH032 substances are given below in Table 21.
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.