British Chemical Standard BCS-CRM 111/1 is sold in the form of chips passing a nominal 1700µm aperture sieve from which the fines passing a nominal 250µm aperture sieve have been removed. It is supplied in bottles containing 100g. Spectroscopic Standard SS-CRM 111/1 is sold in the form of 44mm diameter discs. The preparation of representative samples for chemical analysis and the certification by co-operative analysis was undertaken by Bureau of Analysed Samples Ltd. Bureau of Analysed Samples Ltd is a United Kingdom Accreditation Service (UKAS) Accredited Reference Material Producer, No 4004, and, as the Producer of BCS/SS-CRM 111/1 as defined in BS EN ISO 17034, is fully responsible for assigning the certified values and their uncertainties in accordance with both BS EN ISO 17034 and ISO Guide 35.

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