GB/T 4498-1997 (English Version) PDF

Standard No.: GB/T 4498-1997
Language: Chinese, Available in English version
Release Date: 1997
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Status: Be replaced 2014-09
Replace By: GB/T 4498.1-2013
Latest: GB/T 4498.1-2013

Scope: This standard specifies two methods for determining the ash content of raw rubber, rubber compound and vulcanized rubber. These methods are applicable to raw rubber, compound rubber or vulcanized rubber of categories M, N, O, R and U in GB/T 5576, except for the limitations described in 1.2 and 1.3. This standard does not cover the interpretation of ash produced by inorganic compounding ingredients in rubber compounds or vulcanizates. This is the responsibility of the analyst, who must understand the behavior of various rubber compounds at elevated temperatures. Method A is not applicable to the determination of the ash content of various rubber compounds and vulcanized rubbers containing chlorine, bromine or iodine. Method B is suitable for the determination of compound or vulcanized rubber containing chlorine, bromine or iodine, but not for uncompounded rubber. Compounds containing lithium and fluorine may react with the quartz crucible to form volatile compounds, resulting in low ash measurement results. Platinum crucibles should be used for ashing fluororubber and lithium polymer rubber. In all cases, the two ashing methods do not give the same results, so the ashing method used must be stated in the test report.

GB/T 4498-1997 history