What tacky flux can be used for assembling the EPC lead free (PbF) die?

What tacky flux can be used for assembling the EPC lead free (PbF) die?

EPC’s eGaN FETs and ICs can be mounted directly onto PC boards without added solder by using a tacky flux to hold the part in place while reflowing the solder. An example of an acceptable PbF process uses Kester TSF6502 no-rinse flux. Quick reference die attach and removal instructions, as well as videos, are available on the Assembly Resources page.