Heat-On Block System

Heat-On Block System

Safe and efficient heating for round-bottom flasks

The Heat-O Block System provides a safe, clean and efficient alternative to oil baths and heating mantles for heating and stirring laboratory vessels. Designed for use on standard laboratory stirring hotplates, the system accommodates vials, tubes and round-bottom flasks from 10 mL up to 5 L, including Florentine (pear-shaped) flasks.

Heat-On blocks fit all major hotplate brands with a 145 mm diameter top plate. An optional adapter plate is available for hotplates with a 135 mm diameter top plate, while a square hotplate adapter allows use on square top plates up to 200 × 200 mm.

Fast and uniform heating

Heat-On blocks are manufactured from solid aluminum, providing even heat distribution and rapid heating up to 260 °C. The lightweight construction contributes to fast heat-up times.

Heat-up testing has shown that a 250 mL flask of water can reach boiling in less than 11 minutes, faster than both an oil bath and other heating blocks. In another controlled comparison, a 2000 mL Heat-On block containing a 1000 mL flask of water reached boiling 66% faster than a leading competitor.

The system also uses approximately 30% less energy than the leading competitor when boiling water over a seven-hour period.

Safer than traditional heating methods

Heat-On eliminates the need for oil baths, reducing the risks associated with hot oil, including spills, oil fires and exposure to fumes. Unlike heating mantles, which can be difficult to clean and may create hot spots, aluminum heating blocks provide a cleaner and more practical solution for laboratory heating.

The unique well design helps prevent flask cracking during cooling, while optional PTFE Safety Covers reduce the risk of accidental contact with hot block surfaces. The covers lower the surface temperature by up to 50% and can reduce energy consumption by approximately 15%. Temperature probes and lifting handles remain fully accessible when the covers are installed.

Block finishes

Heat-On blocks are available with two surface finishes.

Fluoropolymer coating

The fluoropolymer-coated blocks offer:

• Excellent chemical resistance to most solvents, acids and alkalis
• Easy cleaning
• Extended product life
• Reduced heat-up time

Anodised finish

The anodized version provides:

• Good resistance to common laboratory solvents
• A durable hard-anodized surface
• Good impact resistance
• Easy cleaning
• A lower-cost alternative

Flexible block configurations

More than 50 block styles and sizes are available for laboratory vessels from 10 mL to 5 L.

The range includes:

• Round-bottom flask blocks
• Florentine (pear-shaped) flask blocks
• Tube and vial blocks
• Multi-well blocks

The Multi-well holder accepts one or two interchangeable inserts.

Available inserts include:

• Flask inserts for 10, 25, 50, 100 and 150 mL flasks
• Multi-tube inserts for 16 mm, 17 mm, 20 mm, 24 mm, 28 mm and 1-inch tubes or vials

Flask inserts also feature cut-away sides for use with two-neck and three-neck flasks.

Both the holder and inserts are available with either a fluoropolymer coating or an anodized finish.

Practical design features

Heat-On incorporates several features that improve day-to-day laboratory use, including:

• Unique well design that helps prevent flask cracking
• Two probe holes for 3 mm temperature probes
• Optional detachable lifting handles
• Compatibility with most leading laboratory hotplates

Heat-On Heat-up Summary

The following data summarizes the time Heat-On takes to boil various volumes of water. It was measured using a Carousel Stirring Hotplate set at its maximum operating temperature.