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See Chinese contents: GB/T 40175.1-2021 GB/T 40175.1-2021: Textiles - Methods of biochemical analysis - Part 1: Cadmium and lead (colloidal gold method)
This Standard specifies the accelerated ageing method of printing paper and writing paper at 100 ??C, and, by evaluating the impact of ageing treatment on the two physical properties of the paper, namely folding number and tearing resistance, predicts the effect of long-term natural ageing process on paper stability. This Standard applies to all kinds of printing paper and writing paper, including coated paper and filled paper.
