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BS ISO 3688:1999

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Pulps. Preparation of laboratory sheets for the measurement of diffuse blue reflectance factor (ISO brightness)
Available format(s)

Hardcopy , PDF

Superseded date

13-12-2022

Language(s)

English

Published date

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.

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 Büchner 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 Köthen).

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.

Committee
PAI/11
DevelopmentNote
Supersedes BS 4432-4(1980) and 96/121776 DC. (07/2005) Reviewed and confirmed by BSI, November 2015. (11/2015)
DocumentType
Standard
Pages
12
PublisherName
British Standards Institution
Status
Superseded
SupersededBy
Supersedes

Standards Relationship
ISO 3688:1999 Identical

ISO 5269-1:2005 Pulps Preparation of laboratory sheets for physical testing Part 1: Conventional sheet-former method
ISO 2469:2014 Paper, board and pulps — Measurement of diffuse radiance factor (diffuse reflectance factor)
ISO 2470:1999 Paper, board and pulps Measurement of diffuse blue reflectance factor (ISO brightness)
ISO 5263:1995 Pulps Laboratory wet disintegration
ISO 5269-2:2004 Pulps Preparation of laboratory sheets for physical testing Part 2: Rapid-Kthen method

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$247.06
Including GST where applicable

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