Standard No.:	GB/T 4497.1-2010
English Name:	Rubber─Determination of total sulfur content—Part 1:Oxygen combustion flask method
Chinese Name:	橡胶　全硫含量的测定　第1部分：氧瓶燃烧法
Chinese Classification:	G40    Rubber products in general
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ
Issued on:	2011-01-14
Implemented on:	2011-12-1
Status:	valid
Superseding:	GB/T 4497-1984 Vulcanized rubber;Determination of total sulphur content;Oxygen combustion flask method
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This part of GB/T 4497 specifies an oxygen combustion flask method for the determination of the total sulfur content of rubber. The method is applicable for the determination of all the sulfur present in various rubber or rubber product, except that contained in barium sulfate. It is applicable to NR, CR, SBR, BR, IR, MR, EPDM, NBR and ebonite as well as the combination product of above rubbers. This method gives unreliable (usually low) results in the presence of lead, antimony, zinc, barium and calcium compounds. If calcium carbonate is the only calcium compound present, good results can be obtained by modifying the absorbing solution. 2 Principle A test sample is ignited in an atmosphere of oxygen in an oxygen combustion flask containing hydrogen peroxide, the carbon and hydrogen of the organic matter being oxidized and the sulfur being converted to sulfuric acid. If necessary, the resulting solution is passed through a cation-exchange column to remove interfering cations. The absorbing solution is titrated with barium perchlorate using thorin indicator or thorin and methylene blue indicator. 3 Reagents and Materials

Contents Foreword I 1 Scope 2 Principle 3 Reagents and Materials 4 Apparatus 5 Preparation of Test Sample 6 Safety Precautions 7 Procedure 8 Expression of Results 9 Test Report Appendix A (Informative) Oxygen Combustion Flask for Reference