A professional who controls kettles to boil soap ingredients, such as lye, resin, palm oil, and tallow, to specified consistency. Respnsibilities include:

• Opens valves to fill kettle with ingredients in specified amounts, and weighs and dumps ingredients in kettle, using scale.
• Opens steam valve to heat kettle to specified temperature.
• Observes boiling rate, reads temperature gauges, and turns valves to maintain temperature within critical limits.
• Boils ingredient for specified time and draws and tests sample for consistency, specific gravity, and chemical content, using laboratory equipment, such as hydrometer.
• Starts pumps and opens valves to transfer mixture to storage tanks.
• May stir ingredients with paddle.