Thermal analysis

Thermal analysis is a group of laboratory techniques that measure how a material's physical properties change as temperature is raised or lowered under a controlled programme. The category covers both the instruments that run these measurements and the furnaces that supply controlled heat for sample conditioning.

In practice it means heating or cooling a sample along a defined temperature profile while an instrument records a property such as heat flow or mass. The recorded curve reveals transitions like melting, decomposition or moisture loss that identify or characterise the material.

A sample is placed in an instrument that applies a programmed heating or cooling rate while a sensor tracks one property against temperature or time. A differential scanning calorimeter measures heat flow, a thermogravimetric analyser measures mass change, and a furnace simply supplies the controlled thermal environment.

The listings divide into instruments that measure a sample's response to heat, such as differential scanning calorimeters and thermogravimetric analysers, and equipment that supplies controlled heat, such as high-temperature furnaces, laboratory furnaces and heat treatment furnaces. A general thermal analysis instrument listed without a more specific type also appears in the catalogue.

It is used for thermal characterisation in polymer science, pharmaceutical formulation and materials research, for compositional and stability testing, and for confirming the thermal stability of formulated biologics. Furnaces in the category serve sample preparation, ashing, sintering and conditioning of materials before analysis.

Start from the property you need to quantify: heat flow points to a differential scanning calorimeter, mass change to a thermogravimetric analyser, and controlled heating alone to a furnace. The temperature range, atmosphere control and accepted sample size follow from that first choice.

A used unit is sold in its existing condition, while a refurbished unit has been serviced and checked before sale. Both are listed at lower prices than new, and for mature furnace designs the difference between the two often comes down to whether heating elements and calibration have been attended to.

Listings in the Questpair catalogue range from EUR 20 to EUR 81.785, with an average of EUR 8.051. The spread reflects the distance between a simple bench furnace and a fully instrumented research calorimeter.

The instrumented end of the category clusters around TA Instruments, Snol, Eppendorf, Bio-Rad and PerkinElmer. The furnace end is more fragmented, with specialist makers represented across the listings.

A warranty is often possible and is arranged in consultation for the specific listing. The terms depend on the individual unit and seller rather than a central policy.

Parts can be sourced via Questpair, which matters more here than in simpler equipment categories because calorimeters, analysers and furnaces all have wear and drift components. For the dominant instrument brands, consumables and documented specifications are generally easier to find.

Lifespan depends on the type and how heavily it has been cycled. Furnace heating elements and insulation degrade with use and are replaceable, while a calorimeter's balance and temperature sensor determine data quality over the longer term and can be recalibrated.

Used and refurbished units are listed at lower prices than new, and for mature furnace designs the saving is substantial because a serviced older unit performs to the same specification. Weigh the two on the individual listing, and note that warranty is arranged in consultation rather than assumed.

The Questpair catalogue lists 179 listings from 18 verified suppliers and distributors across 9 countries. New, used and refurbished units are all represented.

Lead time and shipping depend on the individual listing, the seller's location and whether the unit ships from one of the 9 countries represented. The specifics are confirmed per listing with the supplier.

Calibration standards are inexpensive and the procedure is routine, so a unit that has not been calibrated recently is not disqualified, but budget for recalibration before relying on its data. For a calorimeter or thermogravimetric analyser, confirm the balance, the temperature sensor and the control software are intact; for a furnace, check whether it still reaches its rated temperature.

Among listings that specify a type, furnaces outnumber the instrumented analysers, which is why the average price sits well below the maximum. Materials and polymer labs and pharmaceutical formulators reach for differential scanning calorimeters and thermogravimetric analysers, while labs needing ashing, sintering or sample conditioning reach for high-temperature, laboratory and heat treatment furnaces.

The instrumented end clusters around a small set of makers including TA Instruments, PerkinElmer, Eppendorf and Bio-Rad, while furnaces come from a wider range of specialists. For a buyer, concentration at the instrument end makes parts and specifications easier to source and models easier to compare, while the fragmented furnace end widens the price band and can put a serviced older unit at good value.

The bottom of the band is occupied by simple bench furnaces with mature, well-understood designs, while the top holds research-grade calorimeters and dual-mode analysers with sensors, software and atmosphere control. Condition moves the figure as much as capability does, since used and refurbished units are listed below new across both ends.