Solid-aluminum block is cleaner and safer than oil baths, and transfers heat at a faster rate.
Round design provides a more constant and uniform heat transfer than square block ovens.
Up to three inches of insulation surrounding the block prevent loss of heat and reduces electrical consumption during long-term aging studies. P.I.D. temperature controllers maintain a constant temperature without drifting above or below set point. Preset high-limit switch shuts off power if overheating occurs. A major disadvantage to the present systems of oil immersion testing is the evaporation of volatile fluids. The test must also be carried out in explosion proof enclosures.