GHS secondary labels are applied to secondary containers; primarily used when the substance or mixture is transferred into other containers for workplace use. GHS secondary labels are also required on containers for substances/mixtures manufactured in the workplace, solely for workplace use. ‘Secondary’ containers can vary in type or size, e.g. small ampules, reaction vessels, spray bottles, portable containers and etc.
Requirements for GHS secondary labels have greater flexibility, providing to competent authority the leverage to use alternative means of hazard communication so as long as the information correctly conveys the hazardous information provided on the original supplier label. Size restrictions or inaccessibility of containers allows for the use of signs, placards, batch-sheets, and operational procedures, so as long they identify the products identity and any associated hazards.
It is highly recommended that employers use the GHS labelling system for containers with GHS secondary labels as it maintains uniformity; none the less, alternative systems of hazard communication may be used, provided that workers are trained to have an adequate understanding of this independent labelling system.