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See Chinese contents: GB/T 15252-2014 GB/T 15252-2014: Mix rubber or rubber -- Determination of sulfide sulfur content -- Iodometric method
This Standard specifies a method for the determination of the indentation hardness of plastics and ebonite by means of durometers of two types: type A is used for softer materials and type D for harder materials (see the Note to 8.2). The method permits measurement either of the initial indentation or of the indentation after a specified period of time, or both.
