Incineration of product, ground if necessary, at 550 ± 15°C to constant mass. Apparatus, procedure, expression of results, test report. Not applicable to purposes subject to the Fertilisers and Feeding Stuffs Regulations 1973 or to the Fertilisers and Feeding Stuffs (Amendment) Regulations 1976.Cross References:BS 410BS 4325:Part 1BS 4325:Part 3Fertilisers and Feeding Stuffs Regulations 1973Fertilisers and Feeding Stuffs (Amendment) Regulations 1976