The document specifies a method for determination of the ash content of solid mineral fuels. It is valid for hard coal, coke, brown coal and briquetts.
DIN 51719:1997 history
1997DIN 51719:1997-07 Testing of solid fuels - Solid mineral fuels - Determination of ash content
1997DIN 51719:1997 Testing of solid fuels - Solid mineral fuels - Determination of ash content