Circuposit (tm) 6540b reducer has 90-99% water and 1 - 10% boric acid, which smooths the surface of the board's copper layer.�used in electronic circuit manufacturing technology.
Cm-00044 # & circuposit (tm) 6540b reducer contains water 90-99% and boric acid h3bo3 1 - 10% has the effect of smoothing the surface of the copper layer of the circuit board.