AbstractTechniques for the determination of the formaldehyde to urea and the formaldehyde to melamine ratios by means of an elemental carbon‐nitrogen analyzer are described. Etherified resins require additionally an NMR spectrum of the analyzed sample. Mathematical equations are presented which relate the experimentally determined carbon and nitrogen contents to the compositional characteristics of amino resins. For etherified resins, the ratio of alkoxy groups to the total formaldehyde is also determined. The techniques are assessed by analyzing model samples and by the propagation‐of‐error treatment of the equations. It is shown that the F/U and F/M ratios can be determined with a good accuracy whether or not the resin is ether
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