In the ISO 11402 standard developed by the International Standards Organization (ISO), the following three test methods are defined for the determination of free formaldehyde content in resin types:
The first method is applied to resins with a free formaldehyde content of up to (including) 15 percent by mass. For free formaldehyde contents between 15-30% by mass, the concentrations of the standard volumetric solutions used should be adjusted accordingly.
The second method is applied to resins resulting from polycondensation of urea and melamine with formaldehyde and to furan resins resulting from polycondensation of furfuryl alcohol with formaldehyde without further modification.
The third method is applied to densification resins, including furan resins, melamine resins and phenolic resins, as well as combinations and modifications of these resins.
The purpose of the ISO 11402 standard is to establish recognized and useful determination test methods. For example, these test methods are needed to check compliance with regulations for the handling of hazardous workplace materials.
The free formaldehyde content determined in formaldehyde condensation resins in accordance with this standard represents the actual content at the time of determination.
For the purposes of this standard, the concept of free formaldehyde refers to formaldehyde present in a condensation resin in unbound form as formaldehyde, formaldehyde dihydrate (dihydroxymethylene) or polyoxymethylene.
Formaldehyde resins are commonly used in the polymer and textile industries for adhesives, varnishes, molded objects, and similar applications . These resins are obtained through condensation reactions with formaldehyde. The performance, strength, and water resistance of such resins are affected by their free formaldehyde content. Additionally, formaldehyde emissions in formaldehyde resin-based adhesives are strictly regulated by various standards. Therefore, determining the free formaldehyde content in these resins is crucial.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides test services for the determination of free formaldehyde content in phenolic, amino and condensation resins within the scope of ISO 11402 standard, with its trained and expert staff and advanced technological equipment.
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