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Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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
Important note : Users cannot be edited or removed once added to your Multi user PDF.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.
| 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Superseded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 |
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.
| 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-Köthen method |
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