BS ISO 3688:1999
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Pulps. Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)
Hardcopy , PDF
13-12-2022
English
15-07-2000
Two methods are specified for the preparation of laboratory sheets prior to measuring the diffuse blue reflectance factor (ISO brightness). A traditional method based on preparation sheets in a Buchner funnel using a filter paper or a wire screen and the other method, sheets are prepared in a standard sheet former (conventional or Rapid Kothen). Subsequent measurement procedures are detailed in ISO 2470. All wood types and most other types of pulp are applicable. Pulps with very long fibres, (those with flax, unshortened cotton and similar materials),shall be reduced to a suitable length of fibre before testing by this method. This International Standard shall be used in conjunction with ISO 2469 and ISO 2470.
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