A professional who tends machine that mixes synthetic or natural rubber with solvents and chemicals to produce liquid rubber cement. Respnsibilities include:

• Weighs and measures specified amounts of rubber, chemicals, and solvents, according to mixing instructions.
• Breaks down full batch formulas into partial batches and samples.
• Presses buttons to activate electrically driven paddles that stir mixture, or stirs mixture by hand, using paddle.
• Opens petcock of mixer to discharge cement into cans, or opens pipeline valves to transfer cement.
• Records types of cement mixtures and production of each.