Hotpack 733 Electric Vacuum Oven 0.81 CF 35-300C 115V 11.5A 4-Shelf Laboratory

Hotpack 733 Electric Vacuum Oven 0.81 CF 35-300C 115V 11.5A 4-Shelf Laboratory

The Hotpack Model 733 is a benchtop electric vacuum oven built by The Electric Hotpack Company, Inc. of Philadelphia, PA — a manufacturer of controlled-temperature equipment since 1908. This unit combines electric heating with a vacuum chamber, allowing moisture, solvents, and gases to be removed from samples at lower temperatures than would be possible at atmospheric pressure. The 0.81 cubic foot chamber accommodates four shelf rack positions, making it suitable for processing multiple samples simultaneously.

Specifications & What's Included

• Manufacturer: The Electric Hotpack Company, Inc. — Philadelphia, PA, USA
• Model: 733
• Chamber Volume: 0.81 cu ft
• Interior Dimensions: 14" W × 10.25" H × 10" D
• Temperature Range: 35°C to 300°C
• Voltage: 115V AC
• Current: 11.5A (AC only)
• Number of Shelf Positions: 4, spaced approximately 2 inches apart
• Door: Hinged, glass viewing window with orange silicone gasket seal and cam-action latch
• Vacuum Gauge: 0–30 in Hg (Marsh Instrument Company gauge mounted on side panel)
• Controls: Limit temperature dial, heat selector dial, Hotpack temperature controller dial, two red indicator lights
• Power Cord: 12/3 gauge with 3-prong plug
• Rear panel: Perforated metal for ventilation; vacuum port fitting on side
• Includes: Shelf racks

Applications

Vacuum ovens like the Hotpack 733 are standard equipment in laboratory, pharmaceutical, semiconductor, and materials research environments. By reducing the internal pressure, they allow moisture, residual solvents, binders, and other volatiles to be driven off at temperatures well below their atmospheric boiling points — making them especially useful for drying heat-sensitive materials, outgassing components, curing coatings, and processing samples that would degrade or oxidize in a conventional oven. The 35–300°C temperature range covers a wide array of applications from gentle drying of biological specimens to higher-temperature processing of ceramics, powders, and electronic components. Hotpack was a well-regarded US manufacturer of this type of controlled-temperature laboratory equipment from the early twentieth century through several decades of industrial and scientific lab use, and their vacuum ovens were widely found in university research labs, QC environments, and industrial process development settings.