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See Chinese contents: GB/T 40278-2021 GB/T 40278-2021: Paper and board - Accelerated ageing (exposure to light)
This Standard specifies the test method for accelerated ageing of paper and board exposed to high light irradiance conditions, and predicts the effect of light ageing process on paper stability under natural conditions by evaluating the effect of ageing treatment on the optical properties of paper. This Standard applies to all kinds of white or nearly white paper and board.
