A professional who controls equipment to prepare chemical constituents of synthetic rubber for synthesis by other workers, following formulas and maintaining reactions within prescribed limits. Respnsibilities include:

• Weighs solid materials according to formula, using scale.
• Pumps liquid chemicals to metering or weigh tanks.
• Observes thermometer and recording instruments, and moves heater controls to attain specified temperature in system.
• Starts agitator and opens valves to regulate admission of chemical agents into mixing tanks in prescribed sequence.
• Dumps solid materials into tanks to complete reaction.
• Draws samples of solution for laboratory analysis and titrates sample to determine concentration and facilitate control of materials flow for attainment of product meeting plant standard.
• Tends auxiliary equipment, such as colloid mills, melt tanks, scrubbers, and homogenizers, to prepare or further process emulsions and dispersions.
• Regulates flow of rubber constituents to storage or rubber-synthesis areas, according to schedule or indicated plant needs.
• Maintains records of materials and supplies, shift production, process times and temperatures, and gauge readings for operating log or inventory records.
• May receive and store materials.
• May tend tank farm containing liquid chemicals.
• May clean, inspect, and recharge equipment with materials, such as soda ash or calcium chloride.
• May be designated according to substance prepared as emulsion operator; persulfate make-up operator; or equipment unit operated as chlorobutadiene-scrubber operator.