ISO 7781:2017 PDF

Scope: This document specifies three methods for the determination of the soap and organic-acid content of raw styrene-butadiene rubber (SBR). — Method A is the titration method using indicator reagent. — Method B is the titration method using an automatic potentiometric titrator. — Method C is the back titration method using an automatic potentiometric titrator. Since the soaps and organic acids present in the rubber are not single chemical compounds, the method gives only an approximate value for the soap and organic-acid content.

ISO 7781:2017 Referenced Document

ISO 1042:1998 Laboratory glassware - One-mark volumetric flasks
ISO 1795:2017 Rubber, raw natural and raw synthetic - Sampling and further preparative procedures
ISO 385:2005 Laboratory glassware - Burettes
ISO 4799:1978 Laboratory glassware; Condensers
ISO 648:2008 Laboratory glassware - Single-volume pipettes
ISO/TR 9272:2005 Rubber and rubber products - Determination of precision for test method standards

2017 ISO 7781:2017 Styrene-butadiene rubber, raw - Determination of soap and organic-acid content
2008 ISO 7781:2008 Styrene-butadiene rubber, raw - Determination of soap and organic-acid content
2001 ISO 7781:2001 Styrene-butadiene rubber, raw - Determination of soap and organic-acid content
1996 ISO 7781:1996 Rubber, raw styrene-butadiene - Determination of soap and organic-acid content
1986 ISO 7781:1986 Rubber, raw styrene-butadiene; Soap and organic acid content; Determination