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This International Standard specifies a method of chemically determining free formaldehyde in phenolic resins by potentiometric titration, in aqueous or organic solution. The method is applicable to resins with free-formaldehyde contents up to and including 15 % (m/m). For free-formaldehyde contents between 15 % (m/m) and 30 % (m/m), it may be necessary to adjust the concentrations of the standard volumetric solutions used accordingly. This method must not be used in the presence of hexamethylenetetramine.
 

Document History

  1. NS-EN ISO 11402:2005


    Phenolic, amino and condensation resins - Determination of free-formaldehyde content (ISO 11402:2004)

    • Most Recent
  2. NS-EN ISO 11402:1998


    Plastics — Condensation resins — Determination of free formaldehyde (ISO 11402:1993)

    • Historical Version
  3. NS-EN ISO 9020:1998


    Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method (ISO 9020:1994, including Technical Corrigendum 1:1996)

    • Historical Version
  4. NS-EN ISO 9397:1997

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    Plastics — Phenolic resins — Determination of free-formaldehyde content — Hydroxylamine hydrochloride method (ISO 9397:1995)

    • Historical Version