TDA-5A & 5B Comparison of DOP Substitutes

Material Block Temperature Internal Pressure Flow Photometric Concentration Results/Comments
DOP/DEHP 750-760F 5 psig 10-11 lpm 60% with metering valve fully open Aerosol stream stable, uniform and dry.  Output remained stable and dry while varying the concentration across operating range
DOS/DEHS 780-790F 4.75 psig 6 lpm 75% Aerosol stream dry and uniform. Clogging of the heater block occurred due to increased block temperature
PAO-4 (Emery 3004) 760-775F 5 psig 7 lpm 75% Aerosol stream dry, uniform and stable throughout entire operating range.  Increases in inert gas flow resulted in wet aerosol. Approved by FDA, DOE, US Army, Surgeon General as DOP replacement
Ondina Oil 760-780F 5 psig 7 lpm 75% Aerosol stream is dry and stable. Wet aerosol occurred at < 670 F.  Aerosol pulsation occurred at > 900°F. GOOD REPLACEMENT FOR DOP.
Corn Oil 750-760F 5 psig 10 lpm N/A Aerosol stream wet. Increasing temperature and reducing inert gas flow resulted in no aerosol output at all.  Not Acceptable.
Mineral Oil 750-760F 5 psig 10 lpm N/A Aerosol stream semi-wet. Increasing the temperature while reducing inert gas flow dried aerosol but caused rapid clogging of heater block