Urea resin can be produced through the reaction between urea ( ammonia) and formalin, catalyzed by acid or base. It is formed through compression molding adopting hard chrome plating model, with a temperature controlled at approximately 130—150 celsius degree. Although it’s heat resistance is not as good as phenol resin, it can withstand continuous use below 100 celsius degree, above all, it possesses a strong resistance against organic solvent and oil. The resin intrinsically can be colored freely and it is of excellent glossiness and appearance. As for electric property, it’s arc resistance is superior to that of phenol resin. It’s molding shrinkage, however, is larger than that of phenol resin, and it is also inferior with respect to water resistance, age resistance and boiling endurance. Therefore, it is unsuitable for outdoor or industrial use.
The substance can be applied to such fields as the lids for cosmetic and medical use or for various containers, foodstuff vessels such as chopsticks, basins, bowls, tea trays and fruit dish etc. which are of low heat resistance yet high water resistance, groceries and commodities such as buttons, ashtrays, toys and stationery, electric parts such as vehicle parts, motor parts, lighting appliances, shell of radios, switches and shell of ammeters etc.