So if cardboard is added into briquettes
in the amount of up to 50% (w/w), the price of raw material
for their production can be reduced by up to 50%. Furthermore, this
study showed that the herein analyzed briquettes have a much
higher compressive strength and relaxed density then those made
out of wood chips only, which is important in practical terms.
However, higher heating values are among the lowest and ash content
is also higher in comparison with other commercially used
biomass fuels but the mechanical properties are excellent