British Chemical Standard, BCS-CRM 318A, is sold as 8mm diameter x 95mm length rods for chemical analysis. The steel used for the preparation of this standard was carefully selected by the GKN Group Technological Centre, Wolverhampton, who co-ordinated a very extensive homogeneity examination of this material, including several hundred analyses by neutron activation, to ensure its suitability as an oxygen standard. They also undertook the preparation of the extruded rods. The preparation of representative samples for chemical analysis and certification by co-operative analysis was undertaken by Bureau of Analysed Samples Ltd.

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