PFA Inline Solvent Heaters For Heating Solvents Such As IPA (Isopropyl Alcohol), NMP, And Much More Overview For heating Solvents such as IPA (Isopropyl alcohol), NMP, and much more. The high-purity PFA solvent inline heater. This inline heater is designed to safely heat volatile flammable solvents while maintaining a high purity flow path. Equipped with multiple safety devices this inline heater is certified for operation within a Class I, Division II environment. Single