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The UK Guidance provides an example calculation for methyl ethyl peroxide which is presented in the following. A waste contains 2,9 % methyl ethyl peroxide (C2H5-O-O-CH3) and 3 % hydrogen peroxide. The concentration of hydrogen peroxide is > 1 % and ≤ 7 % (see criteria above). Methyl ethyl peroxide has a molecular mass of 76 g (so ‘mi’ is 76) and one peroxide functional group present (so ni is 1). When applying these values in the the formula ‘Oi (%) = Σ (16 × (ni × ci / mi))’ for a concentration (‘ci’) of 2,9 % in the waste, methyl ethyl peroxide has an available oxygen content (Oi) of 0,61 % (16 × 1 × 2,9 / 76). This is above the available oxygen threshold of 0,5 % for criterion (i), so HP 1 must be assigned.
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.