A sintering furnace and a glazing furnace do different work. Sintering runs long and hot to densify zirconia. Glazing runs short and cooler with a controlled cooling stage to fire stains and glaze without crazing. A combination unit can do both. The question is whether it should.
The capability question is already answered
Modern combination units genuinely do both jobs to specification. If a lab produces a handful of units a day, one chamber is the right purchase and a second furnace is idle capital.
So the decision is not about whether the machine can. It is about what happens to your day when it can only do one thing at a time.
Where it becomes a bottleneck
Sintering cycles are measured in hours. Glaze firings are measured in minutes. Put them in the same chamber and every glaze firing has to wait for a sintering run to finish and the chamber to come down to temperature.
The practical effect is that your finishing work stacks up behind your sintering work. A case that could have shipped Tuesday afternoon ships Wednesday, not because anyone was slow, but because the oven was busy. Once you are running a full sintering load most nights, a shared chamber caps your same day output regardless of how fast your technicians are.
The number that decides it
Count how many glaze firings you would run in a day if the furnace were always free. If that number is 3 or fewer, one chamber is fine. If it is consistently higher, or if you are turning down same day work because of oven availability, the second unit is not a luxury — it is the cheapest capacity you can add.
A dedicated glazing furnace also lets you keep a stable glaze programme without reprogramming between jobs, which removes an entire class of firing errors.
The thermal cycling argument
There is a second reason to separate the chambers, and it is about the equipment rather than the schedule.
Sintering takes a chamber to 1600 C. Glazing runs far cooler. A combination unit doing both is cycling across a very wide temperature range several times a day, and elements and insulation age with thermal cycling, not only with hours at temperature.
A dedicated glazing furnace running a narrow band, and a sintering furnace running its own, both age more slowly than one unit swinging between the two. Over 5 years that is a real difference in service cost.
Contamination is the other quiet issue
Glazing introduces volatile components from stains and glazes into the chamber. Sintering does not. Running both in one chamber means those deposits are present when you next sinter, and they can transfer to the restoration surface.
The symptom is a faint discolouration or cloudiness on sintered units that were not stained, and it is very difficult to trace because nothing in the sintering process explains it.
Labs running both in one chamber should be firing a cleaning cycle regularly. Most do not, because nothing visibly indicates it is needed.
A simple threshold
Count glaze firings per day at current volume, then ask what you would run if the furnace were always available. If the second number is materially higher than the first, the oven is already limiting you and you simply have not attributed it.
Add the contamination and thermal cycling arguments and the second unit usually justifies itself well before the throughput argument alone would.
Go deeper
Comparison of press and porcelain ovens: press and porcelain ovens compared for 2026. Sintering platforms: Dekema sintering ovens.
The UP3D F30 is the dedicated porcelain and glazing unit that pairs with the F20 sintering furnace, so the long cycles and the short cycles stop competing for the same chamber.
Pricing
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The UP3D F30 porcelain glazing furnace is quoted per configuration — voltage, software, extraction and freight all change the number.
The UP3D F30 porcelain glazing furnace → view the product page