ISO 9020:1994 PDF
Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method
Open preview (PDF)Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric methodBinders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method
- Document status:
- Withdrawn
- Format:
- Electronic (PDF)
- Number of pages:
- 4
- Publication date:
- February 3, 1994
- Edition:
- ISO IS 9020 edition 1 version 1
- ICS:
- 87.060.20
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.
Technical details
- Technical committee
- ISO/TC 35 - Paints and varnishes
- SKU
- ISO 9020:1994
