Can you tell the difference between clinker and ash fusion?
Although easily mistaken for clinker, ash fusion is a sign of good quality wood fuel. This is caused when ash melts. This means your biomass fuel is burning even hotter than the ash melting temperature so it begins to liquefy. So essentially it's burning twice! Ash fusion looks similar to pumice and is easy to break whereas clinker has a shiny molten look and is rock solid.
