EN 50267-2-1 specifies the procedure for the determination of the amount of halogen acid gas, other than hydrofluoric acid, evolved during the combustion of compounds based on halogenated polymers, and compounds containing halogenated additives, taken from cable constructions.
For reasons of accuracy this method is not recommended for use where the amount of halogen acid evolved is less than 5 mg/g of the sample taken.
This method is not suitable for defining compounds or materials described as "zero-halogen" or "halogen-free". For such compounds or materials, and all compounds or materials containing less than 5 mg/g halogen acid equivalent, it is recommended to use the method specified in EN 50267-2-2.