PCE vs BNS: The Real Economic Trade-off
Modern PCE is more expensive per kilo. It is usually cheaper per square metre. Sometimes it is not.
A modern PCE dispersant costs roughly 2.5–3× per kilo what a naphthalene sulfonate costs. It is also typically dosed at 25–40% of the BNS rate and delivers a deeper water reduction, which translates into kiln gas savings.
For a 1,500+ m/h line running a standard-density board, the kiln-burn savings alone usually pay back the PCE premium with margin to spare.
For a lower-speed or lower-volume line where kiln gas is not the dominant cost, BNS or even sodium lignosulfonate can be the right answer. We have customers where we have actively recommended against switching them to PCE.
The right dispersant is the one that lowers your total cost per square metre. Ask for the calculation, not the data sheet.