02Industrial & lab furnaces
Heating elements for industrial and lab furnaces
For maintenance teams and laboratories running electric box, tube, muffle and sintering furnaces. Most of these use MoSi2 U elements or straight SiC rods; we check the element you have before anything is quoted.
Last updated 12 October 2026
ATypical situations
Where it usually goes wrong
The original part is hard to get
The furnace maker no longer lists the element, or the part number alone leads nowhere.
What we do: We work from the element itself: part number if readable, otherwise a photo and the dimensions.
A 6/12 element that did not go in
6/12 only gives the two diameters; Le, Lu and the centre distance a can still be different.
What we do: We ask for a, Le and Lu and confirm them in writing before you order.
One MoSi2 element failed
The rest of the set still works.
What we do: MoSi2 elements can usually be replaced one at a time; we check the single element against its neighbours’ size line.
The cold reading of a SiC rod looks wrong
A multimeter at room temperature gives a value that matches nothing.
What we do: SiC resistance is specified hot; we ask for the value marked on the rod and how the rods are wired.
What this furnace type usually uses
| Uses | MoSi2 U elements 6/12 (small lab furnaces also 3/6 or 4/9) and straight SiC rods Ø25 |
|---|---|
| Check | MoSi2: grade, d/c, Le, Lu, centre distance a. SiC: OD, HZ, CZ, OL and the resistance marking |
“Usually” is not a statement about your furnace: every request is checked against your own part number, photos and dimensions.
013D illustrationMoSi2 U element 6/12grade · d/c · Le · Lu · aU-shaped molybdenum disilicide elements for high-temperature electric furnaces.What to send 
023D illustrationSiC heating rod Ø25, straightOD · HZ · CZ · OL · resistanceStraight silicon carbide rods: hot zone in the middle, cold ends at both sides.What to send BHow we work
How we check your element
Send
The furnace model and a photo of the old element, or its part number. Dimensions if you can measure.
We check and confirm the spec
We check the dimensions and reply in writing with the size line we read, any missing value, and whether we can supply it.
You confirm the configuration
Size, number of elements per set and, for SiC rods, how they are grouped by resistance.
Production and shipping
Production and shipping are arranged for the confirmed configuration; the quote covers that element and quantity.
More on how we work.
Testing, checking and packing
Typical steps for elements of these types: power tests on a rack, checks against the size line, and packing in foam and crates. Elements are brittle at room temperature, so handbooks advise unpacking on a flat surface and checking each element for cracks before it goes into the furnace.
Photos show typical elements, testing and packing of each type – not a specific order, and not a promise of how an order is packed. Packing details are confirmed with the quote.
Questions buyers ask
Why does the centre distance matter so much?
The legs of a U element pass through holes or slots in the furnace roof or wall. Leg centre distance is measured centre to centre (a for MoSi2, A for SiC U rods), and it differs between furnaces even when the diameters are the same: a 6/12 element, for example, comes with different centre distances. A few millimetres decide whether the element goes in, so we always ask for it if it is missing.
Can one MoSi2 element be replaced on its own?
Usually yes: unlike SiC, MoSi2 resistance changes very little with age, and element handbooks state that a failed element can be replaced without changing the others in the same circuit. Some dental furnace manuals still ask for all elements to be changed together – follow your manual.
Do SiC rods need to be matched by resistance?
Yes, for rods that run together. SiC resistance is specified hot (around 1000 °C), so a room-temperature multimeter reading says little; the value or test current marked on the old rod is the reference. Element handbooks commonly give ±5 % between rods in series and ±10 % in parallel, and recommend changing an aged group as a set. Tell us how your rods are connected; resistance grouping can be discussed in our reply.
There is no readable part number. What now?
Send the furnace brand and model from the type plate and a photo of the old element next to a ruler, with the dimensions you can measure. Tick “I don’t know the dimensions” in the form if you cannot measure – the photos are enough to start.
Can you tell which element my furnace needs from its name?
Not from the furnace name or a part number alone. Our reply writes out the size line we read from your photos and dimensions, so you can compare it with the old element before you confirm anything.
Request a quote
Send the part number, or a photo of the old element with the dimensions. We reply by email with the size line we read and anything missing.