NEN-EN-ISO 9020
Binders for paints and varnishes - Determination of free-formaldehyde content of amino resins - Sodium sulfite titrimetric method
inactive, Most Current
| Organization: | NEN |
| Publication Date: | 1 May 1998 |
| Status: | inactive |
| Page Count: | 14 |
| ICS Code (Binders): | 87.060.20 |
scope:
The method specified is based on reacting free formaldehyde and alcohol formaldehyde semiacetals in a test portion with excess sodium sulfite solution at a temperature of 0 °C to form hydroxymethane sulfonate, titrating the excess sodium sulfite with iodine solution, decomposing hydroxymethane sulfonate with sodium carbonate solution and titrating the sodium sulfite liberated with iodine solution. The method is applicable to resins resulting from the polycondensation of urea and melamine with formaldehyde and to furan resins resulting from the polycondensation of furfuryl alcohol with formaldehyde without further modification.
Document History
NEN-EN-ISO 9020
May 1, 1998
Binders for paints and varnishes - Determination of free-formaldehyde content of amino resins - Sodium sulfite titrimetric method
The method specified is based on reacting free formaldehyde and alcohol formaldehyde semiacetals in a test portion with excess sodium sulfite solution at a temperature of 0 °C to form hydroxymethane...