Heating Mantle Variac

A heating mantle, or isomantle, is a piece of laboratory equipment used to apply heat to containers, as an alternative to other forms of heated bath. Heating and Insulating Tops These Tops Are Offered With Or Without Heating Capabilities. They Prevent Vapor Condensation In the Upper Half Of a Flask During Distillation Of High Boiling Materials.

A heating mantle, or isomantle, is a piece of laboratory equipment used to apply heat to containers, as an alternative to other forms of heated bath. Heating and Insulating Tops. These Tops Are Offered With Or Without Heating Capabilities. They Prevent Vapor Condensation In the Upper Half Of a Flask During Distillation Of High Boiling Materials.

Aug 03, 2021 Figure 1.51: a) Three sizes of heating mantle, b) Heating mantle connected to a Variac, c) Filling a heating mantle with sand. Heating mantles take some time to warm up (so may be pre-heated during setup of an apparatus), and also take some time to cool down. The mantle will remain warm even after turning off the Variac, and therefore flasks ...

Because the entire apparatus is raised above the level of the table, the heating mantle can be lowered, as shown on the right, to cool the flask quickly. It is very important to include boiling stones in the flask and to plug the heating mantle into a Variac.

Dec 05, 2006 posted on 29-6-2006 at 10:29. Heating mantle question. Alright, so let's say one plugs in a heating mantle, with the variac, and seconds later it begins smoking, the netting turns an awful brown color (which leaves a residue on the flask), and so you unplug it. You look under the netting and there are rings of burn marks on the cotton underneath.

Dec 30, 2012 The heating mantle will burn out rapidly. It is imperative that it is plugged into a variac (power control). b. The size of the heating mantle has to match the size of the flask. Heating mantles that are too big or too small do not provide a good heat transfer; the heating mantle will overheat and burn out quickly.

electrocution. Always disconnect a Variac from the outlet before working with the device plugged into it. Discard the heating mantle if the fiberglass is brittle or cracked. Do not use any electrical equipment if any wires are frayed or exposed. Know where the nearest Fire Alarm Pull Box is to your lab. Know how to use a fire extinguisher.

Heating Mantle. Application: Be suitable for high temperature heating of flask in laboratory. Introduction: Light-weight insulated materials can be shaped into hemispherical heat Insulator by high voltage, with high temperature resistant plastic casing, or casing with structural steel cold rolling plate baked enamel or electrostatic spray.

Heating Mantles. The two types of heating mantles used in the organic chemistry teaching labs are shown below. They are shown plugged into a Variac (in the back of the photo), since heating mantles are NEVER plugged directly into the outlet. The heating mantle on the left is covered with fabric. It comes with a detachable cord, as shown in the ...

Hobart agitator paddle, and an electronic heating mantle (Glas-Col, 600W, 5000mL, silicone-impregnated fiber glass, #100AO414). A 120V Variac was used to regulate the heating mantle power and batch temperature. ... Set Variac for 150-160C temperature and agitate on medium until temperature reached. a. Batch will take on a gelatinous, viscous ...

In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac or Powermite. Turn the heat up gradually, and do not exceed 50-60% of the maximum output of the device. a Variac or Powermite gradually 50-60%. What is …

In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac or Powermite. Turn the heat up gradually, and do not exceed 50-60% of the maximum output of the device. What is meant by the term bumping? Sudden and uncontrolled boiling of liquid.

It is very easy to accidentally overheat heating mantles. • When you are done heating, switch off the Variac and unplug the heating mantle. Allow the bath to cool completely before moving it. Cooling Methods General Notes: • Chemical refrigerators (~5 C) are located in rooms 6319 and 6325. A chemical freezer (–30 C) is located in room 6319.

Jan 04, 2020 Set up a heating mantle as the heat source to distill your compound. Use a lab jack to support it so that you can lower the heat source quickly if you need to. The heating mantle should be plugged into a variac (never directly into an electrical outlet!) The variac (the heavy thing with the dial) should be plugged into an electrical outlet.

Jan 10, 2022 Attach a heating mantle and variac and heat the mixture to a gentle reflux. The variac setting should initially be 25-30. Adjust this setting as necessary until the solution is refluxing . ? While it is refluxing, add the bromine solution at a rate of two drops per second. You need not loosen the stopper on the funnel for the bromine addition ...

Jul 31, 2004 3. Heat the flask in a heating mantle with a variac setting between 50 and 60. 4. As the distillate begins to collect in the graduated cylinder begin to take data. You want to record the distillate temperature for each mL of distillate collected. 5. If the rate of distillation is faster than ~ 1 drop/s you may want to lower the variac setting ...

Jun 01, 2021 142-500. Sand. NA. 25-500+. Most oil baths are good for heating reactions 200 oC as they provide a more even distribution of heat and are easier to regulate. For reactions requiring higher temperatures, heating mantles and sand or salt baths must be used. Heating mantle apparatuses are controlled using a variable voltage regulator (Variac ...

Jun 15, 2020 Without variac transformers, heating mantles would cause hazardous effects. Thus, variac transformers provide the safety inside the lab. (5) Hot-wire cutting of Styrofoams. Regulated heat temperature is a requirement for cutting styrofoams. Hotwires are vulnerable for pressing too much heat, affecting the standard and shape of styrofoams.

Nov 05, 2015 Total novice at chemistry and am only looking to distill ethanol and use it for soxhlet extractions. So I set up the glass to distill the ethanol from a bottle of Everclear, plugged the mantle into the variac and ran it at 50V (lowest setting that would run the mantle). Thermometer never read higher than 7477 but at least the ethanol came over.

Plug the heating mantle into a variac (be sure not to plug it into a regular outlet) and set the variac to ca. 30-40 to begin heating. When the temperature reaches approximately 92-94 C (the melting point of L-lactide), dig a well in the sandbath using a metal scoopula large enough for

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SP Wilmad-LabGlass Hemispherical Micro Heating Mantles, SP Industries. Catalog Number: (14200-156) Limited time offers. Supplier: SP Industries. Description: These micro heating mantles are made of soft, all glass fabric and support the bottom half of glass flasks. ,14200-156EA. Retrieving Each. Sale.

The conventional way to control the power to a heating mantle is through the use of a Variac. In a typical undergraduate teaching laboratory there are some 20 heating mantles in use at any given time, requiring some 20 Variacs, at a cost of approximately 180 each (for an inexpensive one). The price of an inexpensive Variac is usually greater than that of an expensive mantle. …

The electric heating coil (or oil bath on a hot plate) is controlled using a variable voltage controller (i.e., Variac). The voltage controller is adjusted to increase or decrease the temperature setting of the oil bath. Heating mantles should NEVER be plugged directly into an outlet. Comparison of Heating Assemblies

The flask is situated into an appropriately sized heating mantle. The heating mantle should not be plugged directly into an outlet. The heating mantle should be plugged into a variable voltage controller (variac), which is then plugged into a wall outlet. Make sure the variac is turned down to zero initially. Do not plug the variac into an ...

The heating mantle should fit the flask size. The temperature will be difficult to control if the heating mantle lacks contact with the flask. The heating mantle will overheat or burn out if left unintended for too long. • Add the sand into the heating mantle. Make sure the sand occupies 2/3 of the heating mantle. Figure 1 Reflux Apparatus

The input voltage of the heating mantle was controlled using a variac. This allowed the rate of temperature increase and the maximum temperature to be controlled by manual means. When the etchant was being heated from room to reflux temperature the variac setting was first set at 120V and then gradually reduced. The other primary purposed of ...

The variac helps to maintain the temperature below 100 oC E The variac is used in case of a power surge and prevents damage to the heating mantle Expert Answer 100% (1 rating) A heating mantle is an electrical device used to generate heat in laboratories for organic, inorganic or organometallic reactions. It is a v … View the full answer

Variac, heating mantle, and lab jack. Ver. 8/2009 CMP/WO and allow the mixture to stand overnight. Then quench the residual solvent with a small amount of absolute methanol under argon over several hours until the sodium metal is destroyed and allowed to stand overnight again. Add small amount absolute methanol again, and then check the ...

you will use to heat the flask. 4. Your heating mantle has a separate cord – be sure to securely plug and twist the cord on, then slide the heating mantle under the round bottom flask and adjust the iron ring so the flask is snuggly nestled inside the mantle. Plug the heating mantle into the Variac (which should be set to “off” and a ...