Contamination Deposits of the Smoked Rooftiles

Abstract

The surface contaminants on the smoked rooftiles deposited during the manufacturing process were analyzed and its prevention method was discussed. The contaminants are known to reduce the silver luster of the rooftiles. Infrared spectroscopic, gas chromatographic and mass spectroscopic analyses showed that the major components of the contaminants were condensed aromatic materials and some of the 2-4 ring compounds were identified. The amount of contaminants increased with the increasing amount of hydrocarbons. The contaminants on the products were predominantly formed at about 400°C by the contact with the raw smoking gas remained in the flue. The dilution of smoking gas with inert gas prevented the formation of the contaminants.