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ISO 302:2015 pdf free

ISO 302:2015 pdf free.Pulps一Determination of Kappa number
Disintegrate the test specimen in 300 ml of distilled water until it is free from fibre clots and from large fibre bundles. Avoid methods of disintegration which involve extensive cutting of the fibres. Rinse the disintegrator with approximately 90 ml of distilled water. If a combined disintegration and reaction beaker is used, perform the disintegration in 390 ml of distilled water.
Place the beaker in a water bath (6.3) adjusted to maintain a reaction temperature of (25,0±0,2) °C during the entire reaction.
NOTE A constant temperature bath must be used in order to perform this test under standardized conditions.It is recognized, however, that a constant temperature bath may not be available, or a constant temperature may be difficult to maintain, as may be the case for process testing, or in certain locations of a pulp and paper mill.In such cases, determine the temperature of the material in the reaction vessel at the beginning and at the end of the 10-min reaction time, average the two values, and assume this to be the average reaction temperaturethroughout the test. Correct the Kappa number, using the average of the beginning and ending temperature,as shown in 9.1 and 9.2. However, if either of the temperatures measured during the 10-min reaction period is below 20。C or above 30 °C, the test must be repeated after obtaining a temperature bath or in some other way controlling the temperature within the required temperature range. If a temperature correction is used, it must be reported in Clause 10 (test report). The results must also be validated by comparison with those obtained under constant temperature and using the same type of sample, since there might be some variability in results if a temperature correction is used.
Adjust the agitator (6.1) to produce a vortex approximately 25 mm deep in the reaction mixture. It is very important that the stirring is adequate.
Pipette (50±0,1) ml of the potassium permanganate solution (5.3) and 50 ml of the sulfuric acid (5.1) into a beaker. Bring this mixture to 25 °C, quickly add the mixture to the disintegrated specimen and simultaneously start the timing device (6.4). Rinse the beaker with approximately 10 ml of distilled water, and add the washings to the reaction mixture. The total volume shall be 500 ml. At the end of 10,0 min±15 s, terminate the reaction by adding exactly 10 ml of the potassium iodide solution (5.2).ISO 302 pdf download.

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