ISO 6923:2023
(Main)Paints and varnishes — Determination of monomeric diisocyanate content in coating materials and similar products using high performance liquid chromatography with ultraviolet detection (HPLC-UV)
Paints and varnishes — Determination of monomeric diisocyanate content in coating materials and similar products using high performance liquid chromatography with ultraviolet detection (HPLC-UV)
This document specifies a method for the quantitative determination of monomeric diisocyanate content in coating materials, adhesives and other liquid or pasty materials. This method is suitable for the quantification of the following monomeric diisocyanates: methylene diphenyl diisocyanate (MDI, 2,4’-MDI and 4,4’-MDI), toluene diisocyanate (TDI, 2,6-TDI, 2,4-TDI), (cis/trans) isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI,1,6-HDI) in various matrices for concentrations ranging from 0,01 % to 2,0 % mass fraction. For higher concentrations, a suitable dilution before the derivatization with p-nitrobenzyl-N-propylamine (PNBPA) is performed. The measurements are carried out using ultra high performance liquid chromatography (UHPLC) with a multiple wavelength detector.
Peintures et vernis — Dosage des diisocyanates monomères dans les produits de peinture et produits similaires par chromatographie en phase liquide haute performance couplée à un détecteur ultraviolet (HPLC-UV)
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6923
First edition
2023-09
Paints and varnishes — Determination
of monomeric diisocyanate content in
coating materials and similar products
using high performance liquid
chromatography with ultraviolet
detection (HPLC-UV)
Reference number
ISO 6923:2023(E)
© ISO 2023
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ISO 6923:2023(E)
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© ISO 2023
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Published in Switzerland
ii
© ISO 2023 – All rights reserved
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ISO 6923:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 3
7 Reference standards . 4
8 Sampling . 4
9 Procedure .4
9.1 Sample preparation . 4
9.2 Calibration . 5
9.2.1 Preparation of the standard . 5
9.2.2 Quantification . 5
10 Calculation . 7
11 Expression of results . 8
12 Test report .
...
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