Evaluating Masking Residues - (PPT)

摘要

All of the masking materials performed their intended function. None of the masking materials studied left behind deleterious materials as evidenced by SIR. The UV cure materials may be hydrophilic and need to be removed from the board: 1. Even so, lowest readings were in the 30 megohm range. The UV cure materials showed better SIR with longer UV irradiation. The red dye from UV2 that bled into the conformal coating did not cause degradation. The hot melt masking material showed better SIR performance compared to the UV masking materials with less risk should it remain on the board.