BS ISO 3688:2000
Pulps - Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)

Standard No.

BS ISO 3688:2000

Release Date

2000

Published By

British Standards Institution (BSI)

Status

Be replaced 2022-12

Replace By

BS ISO 3688:2022

Latest

BS ISO 3688:2022

Replace

96/121776 DC:1996 BS 4432-4:1980

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.

BS ISO 3688:2000 history

• 2022 BS ISO 3688:2022 Pulps. Preparation of laboratory sheets for the measurement of optical properties
• 2000 BS ISO 3688:2000 Pulps - Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)
• 2000 BS ISO 3688:1999 Pulps - Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)