2-3-4 WH-138G-M (Sn42Bi58) Screen Print Parameters

Stainless steel or rubber,with a shore scleroscope hardness of above 80-90

Print Speed： as fast as to 150mm/s

Wettability and Temperature ：less than 60% RH at 22-28^oC

2-3-5 WH-138G-M Sn42Bi58 Reflow Profile

Parameters for temperature profile

1）The highest haetaing rate is 2.5℃/s in pre-heating zone. Rising over fast will cause tin-balling.

2）Keep the temperature. In the range of 150-210℃ and the temp. rise no bigger than 2.5 degree/s during the soaking zone, which lasts regularly from 60 s to 90 s.

3）The peak temperature. In the reflowing zone changes in the range of 225℃ to　255℃. It will stay for from 40 s to 70 s over 217℃.

4）The cooling rate applied in the cooling segement must be less than 4℃/s.

Additional: The curve should be made according to shape of the plate and function of the devices. The circumstance parameter is suggested to be 25±2℃ by temperature. And 45-65% by humidity.

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