As we experienced sintering problems of our aluminium-SiCp composite recently, the Alumix 123 powders are now under characterization at Chula by XRD and XRF to see whether the passive Al2O3 surface film are growing during 1-2 years storage in the lab and that might hinder the sintering of a new pack of 2 kgs of Alumix 123 has arrived. If Al2O3 passive film is the problem then we can start a new set of experiment soon.