Ceramic-Top Hotplate Stirrer

What is the Ceramic-Top Hotplate Stirrer?

A ceramic-top hotplate stirrer has a chemically resistant ceramic or ceramic-coated plate that tolerates acids, alkalis and solvent spills and reaches up to about 500 °C. It is selected for chemistry laboratories where corrosion resistance and easy cleaning matter.

Overview

The ceramic-top format uses a glass-ceramic or ceramic-coated plate over a resistive heating element, so the surface resists corrosion from acids, bases and organic solvents and can be wiped clean after spills. Maximum plate temperature is typically 450 to 550 °C, and plate diameters of 135 to 180 mm suit common beakers and flasks. Because ceramics conduct heat less well than aluminum, heat-up is slower and temperature uniformity across the plate is moderate, though the surface is more durable. Stirring speed usually ranges from 100 to 1,500 rpm for volumes of 5 to 20 L. Models are available with analog knobs or digital displays, and a residual-heat indicator shows that the plate remains hot. A built-in safety limit cuts power above a set temperature.

How does it work?

A hotplate stirrer has an electrical heating element, typically a resistive coil or film, bonded to a plate of aluminum, ceramic or glass-ceramic, with a magnet drive below it for stirring. A temperature sensor in the plate, or an external PT1000 probe placed in the liquid, feeds a controller that regulates power by PID or on-off control. External probe control is more accurate because the liquid temperature, not the plate, is held at the set point, which avoids overshoot and overheating. A separate safety circuit, typically a bimetal switch or independent electronic limit, cuts power if plate temperature exceeds a fixed value. Plate material affects heat distribution and chemical resistance: aluminum heats evenly and quickly, ceramic resists corrosion, and glass-ceramic is easy to clean. Residual-heat indicators warn users that the plate remains hot after switching off.

What are the key features?

• Corrosion-resistant ceramic or glass-ceramic plate easy to clean
• Maximum plate temperature of 450–550 °C
• Residual-heat indicator warns of hot surface after shutdown
• Independent over-temperature safety cut-out
• Closed-loop stirring speed control with digital display in many models
• Optional external PT1000 probe input for liquid temperature control

What are the technical specifications?

A typical ceramic-top hotplate stirrer configuration offers max plate temperature of 500 °C, plate diameter of 135–180 mm, plate material of Glass-ceramic or ceramic-coated, heating power of 600–1,000 W, stirring speed of 100–1,500 rpm and max stirring volume (water) of 10 L. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Ceramic-Top Hotplate Stirrer is used in heating acidic or alkaline solutions, organic synthesis with solvent exposure, sample digestion on hot surfaces and solvent concentration in beakers. Across the wider Hotplate Stirrers class, laboratories also deploy it for heated dissolution of solids, synthesis under controlled temperature and solvent evaporation in beakers.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, IEC 61326-1, GB 4793.1, GB 4793.9 and ISO 9001. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Use the unit on a heat-resistant, level surface and keep flammable materials away from the plate. Never heat a sealed vessel. Avoid spills on hot plates, since thermal shock can crack glass-ceramic and corrosive spills damage coatings. Place the external probe in the liquid, not touching the vessel wall, and use a probe clamp or holder. Do not exceed the rated temperature and confirm that the independent safety cut-out works during periodic inspection. Allow plates to cool fully before cleaning. Verify temperature with a calibrated thermometer periodically and record the result. For electrical safety refer to IEC 61010-1 and IEC 61010-2-010, and for hazardous solvents consider the fume-hood airflow and ignition sources.

How do I select the right Ceramic-Top Hotplate Stirrer?

Select ceramic-top when chemical resistance and cleanability outweigh speed of heating. Aluminum tops heat faster and more uniformly. In an RFQ, specify maximum temperature, plate diameter, probe requirement, display type and whether a safety limit adjustable by the user is required. Confirm the plate diameter suits your largest vessel.

How does it compare with other Hotplate Stirrers variants?

Choose the plate material and maximum temperature first: aluminum for even heating up to about 380 °C, ceramic or glass-ceramic for corrosion resistance and up to 500 to 550 °C, and stainless steel where mechanical strength is needed. Decide whether plate-only control is sufficient or an external PT1000 probe with PID is needed for accurate liquid temperature. Check the independent safety circuit and its cut-out value, which matters when working with flammable solvents. Match plate diameter to vessel size, typically 135 to 200 mm for beakers and flasks, and confirm maximum stirring volume and speed range. Consider digital display, interface, hood compatibility and whether the housing is spark-free or has sealed controls. For temperature-sensitive samples choose a model with low overshoot and tested accuracy. Specify voltage and plug type.