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Differences between fast and slow coffee roasting

Updated: Oct 17, 2023

Speaking of time, there are three methods of roasting known as fast, slow and optimum. These time-based methods have great effects on the quality and aroma of the coffee.


fast and slow coffee roasting

Fast roast


The flame height of burner and hot air valve are adjusted to obtain high drum pressure and temperature resulting :


• Heavier body

• Low bitterness

• Increase in volume

• Increase in extraction yield

• Increase in solubility of solids

• Increase in acidity


Slow roast


The flame height of burner, roasting time and hot air valve are adjusted to obtain low drum pressure and temperature resulting :


• Lighter body

• Increase in bitterness

• Decrease in volume

• Decrease in extraction yield

• Decrease in solubility of solids

• Decrease in acidity


fast and slow coffee roasting


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