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  • BSI
    BS 7463-4:1991, ISO 9184-4:1990 Fibre furnish analysis of paper, board and pulps - Method of test by Graff \'C\' stain
    Edition: 1991
    $266.02
    / user per year

Description of BS 7463-4:1991 1991

This part of ISO 9184 specifies the preparation, use and colour reactions of Graff “C” stain in fibre furnish analysis. It should be used in conjunction with ISO 9184-1 and, if necessary, with other staining tests defined in ISO 9184-2.

The field of application of Graff “C” stain is very large; it allows the identification of almost all the common papermaking fibres. However, this is based upon very minute differences in the shade and strength of the colours, and accordingly calls for a great deal of training and experience. In practice, the main applications of the Graff “C” stain are as follows:

  1. Differentiation of chemical, semi-chemical and mechanical pulps.
  2. Differentiation of bleached kraft and sulfite in softwood pulps. Generally, the colour difference is sufficient for counting the fibres.
  3. Differentiation of kraft and sulfite in hardwood pulps. The difference in colour is more obvious in unbleached than in bleached pulps.
  4. Differentiation of softwood and hardwood pulps (except dissolving grade pulps). In kraft pulps, the colour difference is sufficient; in sulfite pulps it is somewhat weaker, although in most cases sufficient for counting.
  5. Differentiation of bleached straw and esparto pulps in softwood pulps. The colour difference is distinct.


Standard NumberBS 7463-4:1991, ISO 9184-4:1990
TitleFibre furnish analysis of paper, board and pulps - Method of test by Graff 'C' stain
StatusConfirmed
Publication Date1991-06-28
Identical National Standard OfISO 9184-4:1990
DescriptorsFibre furnish determination, Chemical analysis and testing, Microscopic analysis, Bibliography, Paper products, Stain tests, Paper pulp, Fibres, Determination of content, Colour tests, Paper, Board (paper)
ICS85.060 Paper and board, 85.040 Pulps
CommitteePAI/11
ISBN0 580 19828 6
PublisherBSI
Pages10

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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