Standard [CURRENT]
DIN EN ISO 6923:2024-09
Paints and varnishes - Determination of monomeric diisocyanate content in coating materials and similar products using high performance liquid chromatography with ultraviolet detection (HPLC-UV) (ISO 6923:2023); German version EN ISO 6923:2024
- German title
- Beschichtungsstoffe - Bestimmung des Gehaltes an monomeren Diisocyanaten in Beschichtungsstoffen und ähnlichen Produkten mittels Hochleistungsflüssigkeitschromatographie mit Ultraviolettdetektion (HPLC-UV) (ISO 6923:2023); Deutsche Fassung EN ISO 6923:2024
- Publication date
- 2024-09
- Original language
- German
- Pages
- 20
- Publication date
- 2024-09
- Original language
- German
- Pages
- 20
- DOI
- https://dx.doi.org/10.31030/3547687
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Overview
The responsible national standardization committee is Working Committee NA 002-00-02 AA "Lackrohstoffe" ("Raw materials for paints and varnishes") at DIN Standards Committee Coatings and Coating Materials (NAB). 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.