UREA-FORMALDEHYDE

Urea-formaldehyde, also known as urea-methanal, named so for its common synthesis pathway and overall structure, is a non-transparent thermosetting resin made from urea and formaldehyde heated in the presence of a mild base such as ammonia or pyridine. These resins are used in adhesives, finishes, MDF, and molded objects. General purpose of urea formaldehyde applied such as on plywood, veneering and assembly gluing. The urea formaldehyde reaction in its relation to the preparation of an adhesive.The normal ration on reaction to form a glue use usually the molar ratio of 1U : 1.75 – 1.9 F, and rarely above 1 : 2 for the manufacture of wood particle board a somewhat lower is often used in order to keep the smell of formaldehyde to a minimum.