loading-img
  • 0
  • 0

Preserva Lab

Hot Plate

Hot plates are generally used to heat glassware or its contents. Some hot plates also contain a magnetic stirrer, allowing the heated liquid to be stirred automatically. A Hot Plate is a device, which is used to transfer thermal energy between two or more fluids, at different temperatures and in thermal contact.

Two alternative methods for heating glassware using a hotplate are available. One method is to suspend glassware slightly above the surface of the plate with no direct contact. This not only reduces the temperature of the glass, but it slows down the rate of heat exchange and encourages even heating. This works well for low boiling point operations or when a heat source's minimum temperature is high.

Another method called a tipi setup because it looks a little like a tipi, is to suspend glassware above a plate and surround the flask with a skirt of tin foil. The skirt should start at the neck of the flask and drape down to the surface of the plate, not touching the sides of the flask, but covering the majority of the plate’s surface. This method is for glassware to be heated at higher temperatures because the flask is warmed indirectly by the hot air collecting under the skirt and unlike simply suspending the glassware, this method is better protected from drafts. 

Advantages:

Hot plates for thin flat plate design, simple heat evenly, easy to install and use. Electric hot plate made of stainless steel, ceramics and other materials as the outer shell, electric heating alloy wire to be closed inside the electric hot plate, so that for closed heating, heating no fire, no smell, good safety, applicable to a variety of working environments. There is a big advantage of using a flat plate however the hot plate can be made from several materials like ceramic, aluminium or enamel. An aluminium heating plate can distribute the heat evenly and that too quite fast and efficiently. It is a device that is easy to clean and maintain as well.

Precautions:

  1. Before any maintenance remove the power supply cord of the hot plate from the main supply. Don’t touch the hot plate directly during the operational condition.
  2. Use only heat-resistant, borosilicate glassware, and check for cracks before heating on a hot plate. Do not place thick-walled glassware, such as filter flasks, or soft-glass bottles and jars on a hot plate. The hot plate surface should be larger than the vessel being heated.
  3. Do not use the hot plate in the presence of flammable or combustible materials. Fire or explosion may result-the device contains components that may ignite such materials.
  4. Being careful when removing hot glassware or pouring hot liquids. Use tongs or silicone rubber heat protectors (gripping devices).