This part of ISO 9454 specifies a coding system for the classification of fluxes intended for use with soft solders, according to their active fluxing ingredients, together with requirements for labelling and packaging. WARNING — This part of ISO 9454 deals with products which may be hazardous to health, or which may cause other hazards such as corrosion, fire, etc., if adequate precautions are not taken. It refers only to the technical suitability of substances and in no way absolves the testing laboratory, the supplier or the user from legal obligations relating to health and safety at any stage of flux manufacture or use.