The instrument is designed and made as per national standard of People's Republic of China GB/T508 and ASTM D482 Standard Test Method for Ash Content of Petroleum Products. It is suitable to determine ash content in the petroleum products as per GB/T508. It could not be used to determine ash content in the petroleum products containing ash-forming additives (including additives containing certain phosphorus compounds), lubricating oils containing lead, and used engine crankcase oils.
  The method summary of ash content test: Take ashless filter paper as ignition core. Ignite the sample in the crucible to make it burning to ash and carbon residue. Heat the carbon residue at 775ºC in the high temperature furnace to make it convert to ash. Then cool down and weigh the mass.

Shanghai Changji Geological Instrument Co.,Ltd is established in 1998,the former is Shanghai Geological Instrument Factory under the Ministry of  the National Geology and Mineral Resource.
Changji has four major series and more than 200 types products: more 140 types petroleum instruments,more 60 types highway instruments,each 10 types for laboratory instruments,Rotary viscosity instruments and geological instruments.Also we develop and produce more than 30 kinds of non-standard instruments according to the clients' special requirements each year.It depends on the complete category products,strong matching capacity and fast development ability,its products are not only widely used in China,but also sold and welcomed in 20 countries.