Behind the Scenes of the Lab Equipment Upgrade No One Discusses: The Laboratory Furnace

Enter any accredited testing lab today and you will see a pattern emerging – the equipment that requires more attention is not the latest spectrometer or an advanced microscope. The star piece of laboratory equipment nowadays is the laboratory furnace and it is time for its upgrade cycle.

Cycle of Quiet yet Critical Upgrades

For a long time, the furnaces remained under the radar of upgrading. That was unacceptable in a number of cases because as testing requirements imposed by ASTM, ISO and pharmacopeial organizations get higher, laboratories understand that an old poorly equipped furnace can silently destroy months of flawless work. The temperature variance of five degrees does not seem like a big issue until it invalidates ash content test results or makes sintering test useless.

That is why the procurement team asks a lot of precise questions when making purchases: what is the heat distribution uniformity? What about the ramp rate control? Is the chamber suitable for laboratory muffle furnace use?

Laboratory Muffle Furnace Versus Laboratory Furnace

The first thing to consider is the following. The laboratory muffle furnace is a unique design in which the sample is placed in a separate chamber isolated from all sources of heat and any other combustion byproducts. The main purpose of such equipment is to conduct loss-on-ignition tests, determination of ash and calcination processes.

However, an industrial furnace is meant to have higher temperatures for purposes like annealing metals and firing ceramics. The selection of the right equipment is highly essential.

Why This Is Getting Attention In the Lab Testing Community

Environmental and pharmaceutical laboratories have observed a trend: there are fewer repeated tests conducted once old furnaces are replaced with programmable and computer-controlled models. Fewer repetitions equal faster reporting, less waste of materials, and, taking into account global increases in energy costs, a decrease in electricity used due to enhanced insulation and quicker heating.

In an environmental testing facility, a ten-year-old analog model was switched out with a state-of-the-art laboratory muffle furnace which made it possible to eliminate discrepancies in loss-on-ignition results in just a couple of weeks. It is not an accident; it is the result of the change from guessing to uniform heating.

What Modern Smart Laboratories Take Into Account Before Purchasing Before making the decision to buy, an experienced lab manager considers:

The level of uniformity of heating in the chamber
Programmable ramp-and-soak control
Data logging
Type of the material of the muffle chamber: alumina or silicon carbide, depending on the resistance to contaminants
Cost-effectiveness over the long term or initial cost

The Broader Context

There is no doubt that the laboratory furnace is not the most noticeable tool in a laboratory facility. However, due to new regulations and requirements for repeatability, the furnace is getting a lot of attention nowadays. Those laboratories which approach the issue strategically and not superficially are getting reliable data.

It is worth noting that for those laboratories which consider replacing their equipment, the common message is: make sure to choose the proper laboratory furnace or laboratory muffle furnace.