ISO 3688:1999
Pulps - Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)
- Standard No.
- ISO 3688:1999
- Release Date
- 1999
- Published By
- International Organization for Standardization (ISO)
- Status
- Replace By
- ISO 3688:2022
- Latest
- ISO 3688:2022
- Scope
- This International Standard specifies two procedures for the preparation of laboratory sheets prior to measuring the diffuse blue reflectance factor (ISO brightness). One is the traditional procedure based on preparation of sheets in a Buchner funnel using a filter paper or a wire screen. In the other procedure, the sheets are prepared in a standard sheet former (conventional or Rapid Kothen). Details of the subsequent measurement procedure are given in ISO 2470. It is applicable to all wood pulps and to most other types of pulp. Pulps with very long fibres, such as those made from unshortened cotton, flax and similar materials, shall be reduced to a suitable fibre length before testing by this method. This International Standard shall be used in conjunction with ISO 2469 and ISO 2470.
ISO 3688:1999 history
- 2022 ISO 3688:2022 Pulps — Preparation of laboratory sheets for the measurement of optical properties
- 1999 ISO 3688:1999 Pulps - Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)
- 1980 ISO 3688:1977/Amd 1:1980 Pulps; measurement of diffuse blue reflectance factor (ISO brightness); amendment 1
- 1977 ISO 3688:1977 Pulps; Measurement of diffuse blue reflectance factor (ISO brightness)
