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See Chinese contents: GB/T 11213.5-2006 GB/T 11213.5-2006: Sodium hydroxide for chemical fiber use -- Determination of sulphate content
This Standard specifies the method for the determination of sulfate content in sodium hydroxide for chemical fiber use. In this Standard, Method-A is applicable to products with a sulfate content (by Na2SO4) in sodium hydroxide of 0.001%~0.07%; Method-B is applicable to products with a sulfate content (by Na2SO4) in sodium hydroxide equal to or greater than 0.01%.
