Dear Heyshan That sounds like a simple process. I wonder how much bonding area you had on the sample. I guess the pressure is really important. Thanks Best Leo On 6/17/07, Mendis, Heyshanwrote: > We bonded some samples around 250-300C on our flip chip machine with > around 5-10N force for 2-5min. Make sure both surfaces are oxide free. > You also could enhance the strength by heat threatment around 300C for > 0.5-1hrs.