Urea-formaldehyde, also known as urea-methanal, named so for its common synthesis pathway and overall structure,'s a non-transparent thermosetting resin or plastic, 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. Urea-formaldehyde resin's attributes include high tensile strength, flexural modulus and heat distortion temperature, low water absorption, mould, high surface hard… (More on Urea-formaldehyde)