DIN EN 15416-4:2017-05

This European standard specifies a laboratory method of determining the open assembly time in a standard climate for obtaining a reliable base for comparison of open assembly time between adhesives under referenced conditions. The method gives a result that cannot be applied to the safe manufacture of timber structures without taking into account the influence of factors such as timber density, moisture content, factory temperature and relative air humidity. Adhesive bonds on overlapped test specimens made of beech are subjected to tensile shear tests after various open assembly times until a limit value for shear strength is reached or other requirements are no longer met. In comparison to DIN EN 15416-4:2006-10, the title has been modified and failure modes have been taken into account for assessment. The open assembly time has been redefined and the time intervals for the open assembly time have been divided into slow and fast systems. The responsible committee for this standard is NA 042-04-05 AA "Spiegelausschuss zu CEN/TC 193/SC 1 Holzklebung" ("Mirror committee for CEN/TC 193/SC 1 Wood adhesives") at DIN.