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ISO 8988:2006 Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl method, perchloric acid method and hydrochloric acid method
standard by International Organization for Standardization, 08/01/2006
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ISO 8988:2006 specifies three methods for the determination of the hexamethylenetetramine (hexa) content of phenolic resins:
a Kjeldahl method;direct titration with perchloric acid;potentiometric titration with hydrochloric acid.