# ISO 21561:2005 — Withdrawn and superseded ISO standards

For ISO 21561:2005, item title is Styrene-butadiene rubber (SBR) — Determination of the microstructure of solution-polymerized SBR; status code is 9599; successor is ISO 21561-2:2016 | ISO 21561-1:2015; withdrawn / published date is 2005-11-18, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21561:2005 _(verified: appears in the quote below)_
- **Item title:** Styrene-butadiene rubber (SBR) — Determination of the microstructure of solution-polymerized SBR _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21561-2:2016 | ISO 21561-1:2015
- **Withdrawn / published date:** 2005-11-18 _(verified: appears in the quote below)_

## What the source says

> 40322,IS,,ISO 21561:2005,Styrene-butadiene rubber (SBR) — Determination of the microstructure of solution-polymerized SBR,Caoutchouc styrène-butadiène (SBR) — Détermination de la microstructure du SBR polymérisé en solution,2005-11-18,1,['83.060'],ISO/TC 45/SC 3,9599,,"[64125,66501]",['en'],15,"<p>ISO 21561:2005 specifies procedures for the quantitative determination of the microstructure of the butadiene units and the content of styrene units in solution-polymerized SBR (S-SBR) by <sup>1</sup>H-NMR spectrometry as an absolute method and by IR spectrometry as a relative method. The styrene content is expressed in mass % relative to the whole polymer. The 1,4-trans, 1,4-cis and 1,2-vinyl cont

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).