It is made as per IP 13, ASTM D-189 Specifications. It is useful to determine the amount of carbon residue when an oil is evaporated under specified condition. The Carbon residue valves of crude Oil, residuam etc. These are useful in the manufacture of various lubricants. The apparatus consists of spun sheet iron crucible 25cc Capacity, Sheet Iron hood and sheet iron block on a stand with triangular wire, and gas Burner. -Conradson Carbon Residue single Test Apparatus (Gas Burner) - Elect. Heating with energy regulator control. -Conradson Carbon Residue Four Test Apparatus with gas burner - Elect heating with separate regulator control.