Has anyone used APS or SPS to make a batch of Polymaleic Acid? Usually, H2O2 is used as the catalyst but the pressure goes upto 10 bars (1000 KPa). If you use AIBN, it has to be in a solvent medium such as Toluene or Xyelne. We do not want to handle Xylene/Toluene on the plant and we are restricted to a maximum pressure of 6 Bars (600 KPa)