Untersuchungen über den Zusammenhang zwischen dem Molverhältnis und der formaldehydabgabe bei Harnstoff-Formaldehyd-Leimharzen

The paper reports on the influence of the molar ratio of urea: form-aldehyde in UF-resins on the formaldehyde emission from resins as well as from particle boards bonded therewith. The results show that a lowering of the formaldehyde content in a UF-resin essentially decreases the formaldehyde emission from the resin as well as from particle boards. In the case of particle boards an almost linear relation between molar ratio and formaldehyde emission was found, independently from the method used for emission measurement. The influence of moisture content and density of particle boards on their form-aldehyde release is furthermore discussed.