Examples of substances which may cause a waste to exhibit HP 3 Flammable (fifth indent) and their threshold concentrations

Commission notice on technical guidance on the classification of waste · European Union

Substance name Hazard Statement Codes associated with HP 3 (fifth indent) Equation Concentration limit for waste to be H3-A (fifth indent) (%) (7) Lithium H260 2Li + 2H2O → 2LiOH + H2 0,1 Sodium H260 2Na + 2H2O → 2NaOH + H2 0,2 Magnesium powder (pyrophoric) H261 Mg + 2H2O → Mg(OH)2 + H2 0,1 Aluminium powder (pyrophoric) Aluminium powder (stabilised) H261 2Al + 6H2O → 2Al(OH)3 + 3H2 0,1 Potassium H260 2K + 2H2O → 2KOH + H2 0,4 Calcium H261 Ca + 2H2O → Ca(OH)2 + H2 0,2 Zinc powder / zinc dust (pyrophoric) H260 Zn + 2H2O → Zn(OH)2 + H2 0,3 Zirconium powder (pyrophoric) H260 Zr + 4H2O → Zr(OH)4 + 2H2 0,2 Aluminium carbide H260 Al4C3 + 6H2O → 2Al2O3 + 3CH4 0,2 Lithium aluminium hydride H260 LiAlH4+ H2O → LiAl(OH)2 + 4H2 0,1 Sodium hydride H260 NaH + H2O → NaOH + H2 0,1 Calcium hydride H260 CaH2 + 2H2O → Ca(OH)2 + 2H2 0,1 Calcium carbide H260 CaC2 + H2O → Ca(OH)2 + C2H2 0,3 Calcium phosphide H260 Ca3P2 + 6H2O → 2PH3 + 3Ca(OH)2 0,4 Aluminium phosphide H260 AlP + 3H2O → PH3 + Al(OH)3 0,3 Magnesium phosphide H260 Mg3P2 + 6H2O → 2PH3 + 3Mg(OH)2 0,3 Trizinc diphosphide H260 Zn3P2 + 6H2O → 2PH3 + 3Zn(OH)2 0,6 Diethyl (ethyldimethyl-silanolato) aluminium H260 (C2H5)2Si(CH3)2C2H5Al + 2H2O → 2C2H6 + Al(OH)2Si(CH3)2C2H5 0,4

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Source: EUR-Lex (Cellar) · retrieved 2026-09-07