Opacity of paper or board

This method describes the determination of the opacity (paper backing) of paper by diffuse reflectance. It can be used to determine the opacity of papers or boards which contain fluorescent whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to conform to that in the CIE illuminant C using a fluorescent reference standard provided by an ISO/TC 6 authorized laboratory as described in in the ISO 2470‑1. This method is not applicable to coloured or boards which incorporate fluorescent dyes or pigments.

Suitable sample matrices
Paper and board
Typical turnaround time
3 weeks after receiving the samples
Quality system
Accredited test method
Device families
Standard
Method expert
Ville Roininen
Ville Roininen

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