This Standard sets out a method to measure the diffuse blue reflectance factor (brightness) of pulp, paper and paperboard.The scope of this Standard is limited to pulps, papers and paperboards which are effectively free from materials emitting fluorescent radiation under the conditions of measurement. Such materials are used to enhance the reflectivity of white papers by absorbing ultraviolet radiation and re-emitting it in the blue visible range. ‘Effectively free’ means that the fluorescent contribution to the diffuse blue reflectance factor is not greater than 0.3% reflectance factor. Samples which contain fluorescent materials may be tested by this procedure using a UV or near-UV cut-off filter to exclude UV radiation from the light reaching the test piece (see Clause 7.3), but in such cases the test result is not indicative of the visual appearance of the sample.

DR 05057 CP

AS 1301.446s-1992

AS/NZS 1301.520:2016