# ISO 8660:1988 — Withdrawn and superseded ISO standards

For ISO 8660:1988, item title is Caprolactam for industrial use — Determination of permanganate index — Spectrometric method; status code is 9599; successor is ISO 8660:2002; withdrawn / published date is 1988-04-14, recorded from its source on 2026-08-05.

- **Identifier:** ISO 8660:1988 _(verified: appears in the quote below)_
- **Item title:** Caprolactam for industrial use — Determination of permanganate index — Spectrometric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 8660:2002
- **Withdrawn / published date:** 1988-04-14 _(verified: appears in the quote below)_

## What the source says

> 16040,IS,,ISO 8660:1988,Caprolactam for industrial use — Determination of permanganate index — Spectrometric method,Caprolactame à usage industriel — Détermination de l'indice de permanganate — Méthode spectrométrique,1988-04-14,1,['71.080.30'],ISO/TC 61/SC 5,9599,,[32225],"['en','fr']",2,"<p>Equal volumes of potassium permanganate solution are added to a carpolactam test solution and to a blank (water). After standing for a specified time the absorbance, at a wavelength of 420 nm, of the test solution and of the blank are compared in cells of 5 cm thickness. The permanganat index is the difference between the absorbance of the test sample and that of the blank, multiplied by 100/3. It is a

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).