Opacity of paper or board
Material testingThis 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 testing laboratory
- Standard
- ISO 2471
- Method expert
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