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Muffle Furnace


Presto’s muffle furnace is used to evaluate the ash content of a test sample. The percentage of ash in a component provides vital insights into the properties of the material. The instrument is designed keeping in mind IS and ASTM standards. The testing instrument is widely used in various fields like agriculture, metal treatment, medical research, agricultural, rubber and wool industries.

Coming up with the elegant design, the range of muffle furnace are easy to operate and install. Just send your desired process temperature and digital controller will heat and control the furnace automatically. Our furnace models are designed for various applications like ashing various types of organic and inorganic test specimens and mold heating, etc. The muffle furnace is shielded with thermal efficient products for energy and cost saving operations.

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The testing instrument is used to calculate the percentage of ash same as the index of added mineral loading. To perform the test, weight a piece of  specimen. Now burn the specimen and weight the ash of the burnt sample and calculate the percentage easily. The test procedure involves tearing the specimen in small grates and place it in the already weighed crucible. Now check the weight again.

Now carefully heat the crucible over a Bunsen burner to certain that the paper burns until it is fully burnt. After performing this, transfer the crucible into a presto muffle furnace at 800+25. C or as per the set standards and generate the heat in the furnace until all the carbonaceous matter is burnt off.

Now cool down the crucible in desiccators and measure its weight. Repeat the operation until the weight become constant.

How to calculate the ash content?

Ash, % by weight = 100 a-x/b-x


A= Weight in gram of the crucible and the ash (w3)

B= weight of the crucible and the material (W1) (in grams)

X= weight of the crucible (W2) (In grams)


For accurate results, make three tests and report minimum, maximum and average.

    • The inner chamber of the machine is made up of ceramic with high grade ceramic filling.
    • Outside body is designed with G.I. Sheet duly powder coated.
    • Door Insulation is fabricated by HFK fire bricks.
    • The machine is equipped with a heating element consist of Kanthal A1 Wire.
    • The instrument ensures uniform distribution of temperature as it has kanthal wire on all the sides.
    • The working temperature of the machine can set up to 900 (Higher temperature models are available).
    • The machine is equipped with Digital indicator cum temperature controller duly fitted on the upper side of the equipment.
    • It is also fitted with switches and indicating lamps.
    • The machine provides controller rating of 2.5KW approx with the accuracy of +/-5C.
    • The testing instrument requires power supply of 230 V, 50 Hz.

    Optional Accessories:

    • Digital Timer
    • Digital PID Controller.

    • The machine provides highly accurate and reliable results.
    • The Muffle furnace is painted in Blue and Autumn Gray combination paint to give it a rust resistant finish.
    • The Instrument is supplied complete with Instruction Manual and Calibration Certificate perceptible to NABL approved Labs.

2 Reviews of Muffle Furnace

  1. nikhil kumar
    23 Dec, 2015

    I love the design of the muffle furnace and it is really simple to operate. I am happy with the working procedure of the machine and allows to set the required process temperature. This makes the testing procedure easy.

  2. Gurmeet
    29 Jan, 2016

    An excellent ash content measurement tool, standard design and great option for the rubber and wool industries. Muffle furnace provides great result.

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