Cox and Sons Rolling Thin Film Oven

James Cox and Sons Rolling Thin Film Ovens (RTFO’s) provide accurate chamber temperatures with minimal overshoot for measuring the effect of heat and air on a moving film of asphalt binder. This simulates short-term aging during production, handling and paving operations as a controlled flow of heated air is directed into rotating glass bottles.

Units feature a PID controller, Precision Resistance Temperature Detector (RTD) and dual four-digit display for simultaneous viewing of actual and set point temperatures. A solid-state digital temperature controller with built-in over-temperature protection and 200 Watt heating controls temperature to ±1°F at 325°C (±0.5°C at 163°C). Ovens have enameled steel exterior and double-wall construction. Older MO-30 units can be upgraded with a Digital Flowmeter. Optional MOA-12 or Data Logging MOA-14 electronic platinum resistance thermometers (PRT) can be specified when ordering a new oven, or ordered separately. These precision thermometers are accurate to ±0.05°C (±0.09°F) and are acceptable alternatives to mercury thermometers and avoid regulatory restrictions.

MO-30 Units are supplied with a mechanical flowmeter, moisture indicator and air pressure gauge with regulator.

MO-32 Units have moisture indicators and air pressure gauges with regulators, but feature a digital flowmeter rather than mechanical.

“F” suffix species units with 230V/50Hz voltage.


  • Precise chamber temperature with minimal overshoot
  • Dual four-digit display provides simultaneous view of actual & set point temperatures
  • Solid-state digital temperature controller controls temperature to ±1°F at 325°C (±0.5°C at 163°C)

Included Items:

  • MO-30 or MO-32 James Cox and Sons Rolling Thin Film Oven
  • Eight serial-numbered RTFO Bottles
  • Stainless steel tongs with gripper pads for easy handling of hot bottles

Optional Accessories:

Applications Aging of binder in hotmix asphalt, Effect of heat and air on a moving film of asphalt binder
Type Forced-Air Convection
Maximum Temperature Range °F (°C) 200° to 399° (93° to 203°)
Controller Programmable Microprocessor UL
Pressure Range 0 - 100 psi
Dimensions 40x26x36in (1016x660x915mm) WxDxH
Estimated Shipping Weight lb (kg) 380lbs (172kg)
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