NF EN ISO 12625-16, Q34-030-16 (05/2024)

ISO 12625-16:2015 specifies test procedures for the instrumental determination of the opacity of tissue papers or tissue products, by diffuse light reflection, using a paper background. It also contains specific instructions for the preparation of test pieces for single-ply products and multi-ply products, where specific preparations/procedures may be necessary. It can be used to determine the opacity of tissue papers or tissue products containing fluorescent brightening agents, provided that the UV content of the radiation incident on the test piece has been adjusted to conform to that of the CIE illuminant C, using a fluorescent reference standard provided by an approved laboratory, as described in ISO 2470-1. ISO 12625-16:2015 does not apply to colored tissue papers and tissue products, including fluorescent dyes or pigments.
(Automatic translation from French)