Rectangular Hot Plate

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A Rectangular Hot Plate is a flat, electrically heated surface used to heat samples, beakers, flasks, or other laboratory vessels uniformly. A rectangular hot plate typically has a metallic top plate (often stainless steel or aluminum) that provides even heat distribution. It’s mounted on an insulated body with temperature control knobs or digital regulators.

Its surface is shaped like a rectangle (not round). Hot Plate is an electrically powered plate that provides controlled heat. Used to heat liquids, chemical solutions, or samples evenly for experiments, chemical reactions, or evaporation.

Technical Specification of Rectangular Hot Plate

Material	MS, SS
Power	1500 to 3000 W
Size	25 x 30 cm to 45 x 60 cm
Maximum Surface Temperature	300 deg cel
Supporting Heeds Material	Ceramic
Voltage Supply	230 V

 

Sizes	Rating Watts
25 x 30 cm	1500
25 x 40 cm	2000
30 x 45 cm	2000
45 x 60 cm	3000

 

Features of Rectangular Hot Plate:

Main features of a Rectangular Hot Plate used in laboratories comprises of:

• Shape & Design: Rectangular-shaped heating surface for accommodating multiple flasks, beakers, or test tubes. Compact, stable, and corrosion-resistant body (often made of mild steel or stainless steel).
• Heating Surface: Made from cast iron, stainless steel, or aluminum for even heat distribution. Surface is smooth and flat, ensuring uniform contact and efficient heating.
• Temperature Range: Typically ranges from ambient to 300–400°C (varies by model). Some advanced models can reach up to 500°C.
• Temperature Control: Thermostatic or electronic temperature control (knob or digital controller). Allows precise regulation of heating levels.
• Power Rating: Generally between 500 W to 2000 W, depending on size and usage.
• Size of Plate: Common plate sizes: 10" × 12", 12" × 18", 18" × 24", etc. Suitable for multiple or large vessels.
• Safety Features: Overheat protection or thermal cut-off. Indicator lamp to show power ON/OFF or heating status. Insulated base to prevent heat loss and protect workbench.
• Construction Material: Outer body: Powder-coated mild steel or stainless steel for durability. Heating element: Nichrome wire or ceramic insulated heater embedded below the plate.
• Operation Type: Works on 230 V AC single phase or 110 V AC (depending on country).
• Optional Add-ons:
• Magnetic stirrer combination (in some models).
• Digital temperature display.
• PID controller for precise temperature regulation.

Advantages of Rectangular Hot Plate:

The rectangular shape provides a wider and longer heating area compared to circular ones. It is ideal for heating multiple flasks, beakers, or test tubes simultaneously. The Uniform Heat Distribution ensures even heating across the surface which is important for experiments requiring consistent temperature. This reduces the risk of localized overheating.

Rectangular Hot Plate fits easily on lab benches or fume hoods because of its compact, flat design. The rectangular shape allows it to be placed alongside other instruments neatly. It is suitable for various Vessel sizes and can accommodate rectangular, square, or multiple round-bottom containers at once. It also offers flexibility for different experimental setups.

Rectangular Hot Plate is easy to clean and maintain. It usually has a smooth ceramic or stainless-steel top that resists spills and corrosion. Cleaning after chemical use is simple. The flat rectangular base provides stability to containers. It often includes temperature control knobs and safety cut-offs.

Rectangular Hot Plate is commonly used in analytical, biological, and chemical labs for long-duration heating tasks or simultaneous sample processing.

Process of Rectangular Hot Plate:

Heating Element: The core of the hot plate is a nichrome wire or similar resistive heating element. When electric current passes through this wire, it generates heat due to electrical resistance (Joule heating).

Heat Transfer : The heating element is placed beneath the rectangular metal plate. A mica sheet or ceramic insulator is usually placed between the wire and the plate to prevent electrical contact while allowing heat transfer. Heat moves from the wire to the metal plate by conduction, making the surface hot and ready for experiments.

Temperature Control : Most hot plates have a thermostat or temperature controller. As the plate reaches the set temperature, the thermostat switches the current ON/OFF automatically to maintain a constant temperature. Digital controllers may have a sensor under the plate to precisely regulate heating.

Safety Insulation : Insulating materials like asbestos or mica sheets prevent heat from escaping downward and protect the user from burns or electric shocks. The base is often made heat-resistant and electrically insulated

Execution Steps in Use:

• Connect the hot plate to the electrical supply.
• Set the required temperature using the knob or digital control.
• Switch ON the plate. The heating element starts generating heat.
• Heat transfers from the element to the plate surface.
• Thermostat monitors temperature and cycles the current to maintain it.
• When the experiment is done, switch off the hot plate and let it cool naturally before touching.

Observations During Process

• Temperature rises steadily until the set value.
• Plate surface becomes uniformly hot.
• Some models have indicator lights showing “heating” or “ready.”

Rectangular Hot Plate application industries:

• Pharmaceutical Industry
• Chemical Industry
• Food & Beverage Industry
• Research & Development Laboratories
• Biotechnology Industry
• Electronics Industry
• Material Testing Laboratories
• Paints & Coatings Industry
• Petrochemical Industry
• Textile Industry