NBN ISO 1434:2021

This International Standard specifies two methods for the determination of the amount of bale coating
present on the outside wrapper sheets of bales of natural rubber:
— ashing method;
— brushing or scraping method.
The ashing method is the preferred method.
NOTE 1 The brushing or scraping procedure, while much faster, is not suitable for use on such rubbers which
have holes on the surface where coatings could penetrate, making its removal difficult.
NOTE 2 The ashing procedure is not suitable for coating materials which are affected by the ashing. In
particular, coatings containing carbonates or organic matter can give very low results.