Understanding Micro Combustion Calorimetry (MCC)
Micro Combustion Calorimetry (MCC), also known as Pyrolysis Combustion Flow Calorimetry (PCFC), applies the traditional oxygen consumption principle through a micro calorimeter. MCC tests are unaffected by processing, allowing examination of pellets and components pre-processing.
MCC Testing Process
Samples are heated in a decomposition furnace at rates of 1-5K/s. Decomposition products, carried by inert gas, mix with oxygen and enter a 900°C combustion chamber. Complete oxidation occurs, and the oxygen loss determines the heat release rate.
MCC Advantages
A small plastic sample (2-3 mg) is heated in an inert gas environment. Once heating and inert gas supply stop, an igniter lights the combustible gases and introduces oxygen. Heat release is measured by oxygen consumption. Heat released per unit and sample temperature are recorded.
MCC Test Results
For flame retardant and non-flame retardant FC+ABS blends, MCC shows the temperature shift for the maximum mass change is around 95 K. The flame retardant blend’s heat release rate decreases by about 130W/g. PC+ABS has a scatter of 80W/g, slightly higher than the flame retardant blend, due to additive distribution unevenness.
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