ISO 8112:2023
(Main)Caprolactam for industrial use — Determination of colour of 50 % aqueous caprolactam solution, expressed in Hazen units (platinum-cobalt scale) — Spectrometric method
Caprolactam for industrial use — Determination of colour of 50 % aqueous caprolactam solution, expressed in Hazen units (platinum-cobalt scale) — Spectrometric method
This document specifies a spectrometric method of determining the colour, expressed in Hazen units, of a 50 % aqueous caprolactam solution as a measure of coloured impurities content of the sample.
Caprolactame à usage industriel — Détermination de la coloration d'une solution aqueuse à 50 % de caprolactame, exprimée en unités Hazen (échelle platine-cobalt) — Méthode spectrométrique
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INTERNATIONAL ISO
STANDARD 8112
Second edition
2023-07
Caprolactam for industrial use —
Determination of colour of 50 %
aqueous caprolactam solution,
expressed in Hazen units (platinum-
cobalt scale) — Spectrometric method
Caprolactame à usage industriel — Détermination de la coloration
d'une solution aqueuse à 50 % de caprolactame, exprimée en unités
Hazen (échelle platine-cobalt) — Méthode spectrométrique
Reference number
ISO 8112:2023(E)
© ISO 2023
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ISO 8112:2023(E)
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© ISO 2023
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© ISO 2023 – All rights reserved
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ISO 8112:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 1
7 Procedure .2
8 Expression of results . 2
9 Test report . 3
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© ISO 2023 – All rights reserved
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ISO 8112:2023(E)
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
This second edition cancels and replaces the first edition (ISO 8112:1984), which has been technically
revised.
The main changes are as follows:
— the option to use a flow-through cell for the absorption measurement has been added;
— the temperature of measured solution has been taken into account.
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