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M00002452
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ISO 4660:2020
Rubber, raw natural - Colour index teststandard by International Organization for Standardization, 06/01/2020
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ISO 4660:2020 specifies two methods to determine the colour of raw natural rubber according to a standard colour scale:
Method A: colour matching against standard coloured glasses;
Method B: colour determination using colour spectrophotometer.
In case of dispute, the preferred method is Method B.