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BS 4427-1:1969 Methods of test for sodium tripolyphosphate (pentasodium triphosphate) and sodium pyrophosphate (tetrasodium pyrophosphate) for industrial use. Determination of matter insoluble in water in sodium tripolyphosphate
standard by BSI Group, 02/28/1969
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Dissolution of test sample and separation of any insoluble matter by filtration, drying at 1105C and weighing.Cross References:
BS 3978