Made to order
- Install, training & calibration commissioned on site by Carbolite Gero service
- Validated first cycle atmosphere & soak profile dialed in for your alloy
Carbolite Gero HTMA Controlled Atmosphere Oven – Up to 700°C | 28–1000 L
Controlled atmosphere oven for metal AM post-processing and materials research — 400–700°C max (4 grades), 28–1,000 L chambers (5 sizes), O₂ down to 50 ppm with N₂/Ar purge. Seam-welded gas-tight chamber built as an atmosphere unit from the ground up.
- ✓ O₂ down to 50 ppm — atmosphere-controlled heat treatment without vacuum-furnace cost
- ✓ 17 configurations in one family — 28 L lab to 1,000 L production, same gas architecture
- ✓ Seam-welded gas-tight chamber — purpose-built, not a retort-converted standard oven
- ✓ Configured to order — request lead time; install, training & cycle validation included
What your process engineer actually checks
Atmosphere you can document
Oxygen down to 50 ppm under N₂ or Ar purge, with optional outlet O₂ monitoring logged per run via the Nanodac controller — the traceability an AS9100 or NADCAP heat-treatment record needs. Fully seam-welded chamber, no retort leak paths.
One recipe, 17 sizes
The same gas-control architecture runs from a 28 L bench oven to a 1,000 L production chamber. Prove a stress-relief or anneal cycle on the small oven, then transfer it to production without re-developing the process.
An applications engineer on the line
Not a remote ticket queue. We run heat treatment on LPBF titanium and stainless in-house at AO Metal — atmosphere, soak temperatures and ramp rates for your alloys, answered in under 24h. NDA on request.
The Carbolite Gero HTMA is a range of controlled-atmosphere ovens covering 400°C to 700°C in chamber volumes from 28 to 1,000 litres — 17 configurations in one family. The chamber is fully seam-welded and engineered as an atmosphere unit from the ground up, not a retort added to a standard oven. Under nitrogen or argon purge, internal oxygen down to 50 ppm is achievable, with optional real-time O₂ monitoring and closed-loop control via a Nanodac programmer. For metal additive manufacturing it is used primarily for post-processing — stress relief, annealing and low-temperature solution treatment of Ti-6Al-4V, stainless, nickel and copper alloys in an oxygen-controlled environment, without the cost or complexity of a vacuum furnace.
Why engineers choose the HTMA
Atmosphere-controlled heat treatment for oxidation-sensitive alloys — the spec figures below are from the Carbolite Gero datasheet.
O₂ down to 50 ppm
Nitrogen or argon purge reaches oxygen levels low enough for oxidation-sensitive alloys — Ti, Cu, stainless — without a vacuum system.
Seam-welded gas-tight chamber
Designed as an atmosphere unit and fully seam-welded to contain modified atmospheres — no leakage paths from a bolt-on retort interface.
17 configurations, one architecture
The same gas-control design scales from a 28 L bench oven to a 1,000 L production chamber, so a validated recipe transfers directly between sizes.
Separate purge & process gas control
Independent flow controls purge atmospheric air, then run process gas at a lower rate. Manual valves standard; automatic programmable control and outlet O₂ monitoring optional.
How Additive Plus delivers it
Configured to order, installed and validated by engineers who run heat treatment in-house.
Configure to your process
Pick temperature grade (400–700°C), chamber volume, controller and gas-control options — automatic control, stainless valves, flow-failure alarm, O₂ monitoring.
Install & train on site
US-based delivery, installation and operator training. Thermocouple calibration and gas-flow setup handled by Carbolite Gero service.
Validate your cycle
We dial in atmosphere, soak temperatures and ramp rates for the alloys you print — and can run your parts at AO Metal before the oven ships.
Temperature grades & chamber volumes
| Model | Max temp | Available chamber volumes |
|---|---|---|
| HTMA 4/x | 400°C | 28, 95, 220, 500, 1000 L |
| HTMA 5/x | 500°C | 28, 95, 220, 500, 1000 L |
| HTMA 6/x | 600°C | 28, 95, 220, 500, 1000 L |
| HTMA 7/x | 700°C | 28, 95, 220 L |
Minimum operating temperature is approximately ambient +60°C. Full per-model heat-up times, dimensions, shelf loading and power ratings are in the Specifications tab and the datasheet below.
Typical applications
Where the HTMA earns its place in an AM and materials workflow.
Not sure the HTMA is the right oven?
If you don’t need an inert atmosphere, a simpler Carbolite Gero oven from the same family may fit better.
Particle-clean, not gas-inertHTCR Clean Room OvenView oven →
General lab heatingPF Laboratory OvenView oven →
Why source through Additive Plus
- AM heat-treatment expertise — atmosphere selection, soak temperatures, ramp rates and quench paths for the alloys you’re printing; not just oven delivery.
- In-house heat treatment at AO Metal — we run post-processing on LPBF titanium and stainless parts and can validate your cycle before the equipment ships.
- US-based support and consumables — Carbolite Gero service, spares and thermocouple calibration handled locally.
- Leasing and financing available — with a sub-24h engineer response on every enquiry.
HTMA — product overview
| Brand | Carbolite Gero |
| Model (representative) | HTMA 6/28 |
| Max temp | 600°C (family: 400–700°C) |
| Volume (litres) | 28 (family: 28–1000 L) |
| Atmosphere | N₂ / Ar purge — O₂ down to 50 ppm |
| Heat-up time (mins) | 60 |
| Recovery time (mins) | 10 |
| Dimensions: Internal H x W x D | 12.01 × 12.01 × 12.01 in / 305 × 305 × 305 mm |
| Dimensions: External H x W x D | 38.98 × 31.89 × 34.84 in / 990 × 810 × 885 mm |
| Shelves fitted / accepted | 2 / 2 |
| Shelf loading each / total (kg) | 10 / 20 |
| Max power (W) | 2000 |
| Weight (kg) | 73 |
Product videos
Send us your printed parts and target spec. We'll run a paid trial stress-relief or anneal cycle under controlled atmosphere at AO Metal in California and share the results before you specify an oven.
Complete the workflow
Bench-top fan-convection laboratory oven — 250 °C max across three sizes (28, 66, 128 L), ±5 °C uniformity at 250 °C and a ~23-minute heat-up, with a chemically resistant stainless-steel chamber and R38 digital PID control.
- ✓ 250 °C fan-convection heating — ±5 °C uniformity, 23–26 min heat-up, 3 min recovery
- ✓ Three bench sizes — 28, 66 and 128 L, stackable to save space
- ✓ Chemically resistant stainless-steel liner — built to BS EN 61010-2-010
- ✓ Configured to order — lead time on request; install & support included
High-temperature laboratory oven in three grades — 400, 500 and 600 °C — and three bench sizes (30, 60, 120 L). A heavy-duty convection fan and low-thermal-mass insulation give fast, uniform heating, and the oven is rated for continuous operation.
- ✓ Three temperature grades — 400, 500 and 600 °C
- ✓ Three bench sizes — 30, 60 and 120 L, brushed stainless interior
- ✓ Rated for continuous operation — R38 PID control
- ✓ Configured to order — lead time on request; install & support included
Fan-convection laboratory oven in six sizes from 28 to 910 L — 300 °C on PF 30–PF 200, 250 °C on the large PF 400/800, with ±5 °C uniformity, a stainless-steel chamber and options for solvent stoving, curing and moisture extraction.
- ✓ Fan convection to 300 °C — ±5 °C uniformity, rapid heat-up and recovery
- ✓ Six sizes, 28–910 L — bench-top to floor-standing
- ✓ Stoving & curing, moisture extraction and variable-speed fan options
- ✓ Configured to order — lead time on request; install & support included
High-temperature industrial oven in four grades — 400, 500, 600 and 700 °C — and four chamber sizes from 28 to 350 L. Robust construction, a stainless-steel liner and perforated shelves handle ageing, tempering, stress relief and high-temperature curing in air.
- ✓ Four temperature grades — 400, 500, 600 and 700 °C
- ✓ Four chamber sizes — 28, 95, 220 and 350 L
- ✓ Robust build — stainless-steel liner, perforated shelves, door switch
- ✓ Configured to order — lead time on request; install & support included
Clean room oven to 250 °C in nine sizes from 30 to 1,810 L — fully sealed low-shedding insulation, enclosed brushless fan and a particle-free door seal keep the load clean, with an optional inert-atmosphere package and through-wall designs.
- ✓ 250 °C clean heating — low-shedding insulation, enclosed brushless fan, particle-free seal
- ✓ Nine sizes, 30–1810 L — bench chamber to floor-standing
- ✓ Inert-atmosphere, through-wall flange and over-temperature options
- ✓ Configured to order — lead time on request; install & support included
Other products teams run alongside Carbolite Gero HTMA Controlled Atmosphere Oven – Up to 700°C | 28–1000 L
Clean room oven to 250 °C in nine sizes from 30 to 1,810 L — fully sealed low-shedding insulation, enclosed brushless fan and a particle-free door seal keep the load clean, with an optional inert-atmosphere package and through-wall designs.
- ✓ 250 °C clean heating — low-shedding insulation, enclosed brushless fan, particle-free seal
- ✓ Nine sizes, 30–1810 L — bench chamber to floor-standing
- ✓ Inert-atmosphere, through-wall flange and over-temperature options
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
High-temperature industrial oven in four grades — 400, 500, 600 and 700 °C — and four chamber sizes from 28 to 350 L. Robust construction, a stainless-steel liner and perforated shelves handle ageing, tempering, stress relief and high-temperature curing in air.
- ✓ Four temperature grades — 400, 500, 600 and 700 °C
- ✓ Four chamber sizes — 28, 95, 220 and 350 L
- ✓ Robust build — stainless-steel liner, perforated shelves, door switch
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
Fan-convection laboratory oven in six sizes from 28 to 910 L — 300 °C on PF 30–PF 200, 250 °C on the large PF 400/800, with ±5 °C uniformity, a stainless-steel chamber and options for solvent stoving, curing and moisture extraction.
- ✓ Fan convection to 300 °C — ±5 °C uniformity, rapid heat-up and recovery
- ✓ Six sizes, 28–910 L — bench-top to floor-standing
- ✓ Stoving & curing, moisture extraction and variable-speed fan options
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
General-purpose industrial oven to 300 °C in three sizes (220, 330, 450 L) with a choice of vertical (A) or horizontal (B) airflow, a 430-grade stainless-steel case and robust production-duty construction — with AMS2750F (Nadcap)-ready builds available.
- ✓ 300 °C production-grade oven — ±5 °C uniformity, vertical or horizontal airflow
- ✓ Three sizes — 220, 330 and 450 L
- ✓ AMS2750F (Nadcap)-compliant builds available for aerospace heat treatment
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
Bench-top fan-convection laboratory oven — 250 °C max across three sizes (28, 66, 128 L), ±5 °C uniformity at 250 °C and a ~23-minute heat-up, with a chemically resistant stainless-steel chamber and R38 digital PID control.
- ✓ 250 °C fan-convection heating — ±5 °C uniformity, 23–26 min heat-up, 3 min recovery
- ✓ Three bench sizes — 28, 66 and 128 L, stackable to save space
- ✓ Chemically resistant stainless-steel liner — built to BS EN 61010-2-010
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
Large-format industrial oven with the range's widest choice of size and temperature — 500 to 13,820 L in four grades (250, 425, 625 and 700 °C). Heavy-duty impellers, a 430-grade stainless interior, single/double doors and a 3216CC controller with over-temperature protection, plus AMS2750F (Nadcap)-ready builds.
- ✓ 500 to 13,820 L — the largest ovens in the range, single or double door
- ✓ Four temperature grades — 250, 425, 625 and 700 °C
- ✓ AMS2750F (Nadcap) builds, explosion relief and motorised doors available
- ✓ Configured to order — lead time on request; install & training included
Made to order
· Lead time: configured to order — request current lead time. Large-format install and training included.
High-temperature laboratory oven in three grades — 400, 500 and 600 °C — and three bench sizes (30, 60, 120 L). A heavy-duty convection fan and low-thermal-mass insulation give fast, uniform heating, and the oven is rated for continuous operation.
- ✓ Three temperature grades — 400, 500 and 600 °C
- ✓ Three bench sizes — 30, 60 and 120 L, brushed stainless interior
- ✓ Rated for continuous operation — R38 PID control
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.
Rapid-cooling oven for annealing thermoluminescent dosimeters (TLDs) — 400 °C in a compact 3 L chamber with a CC-T1 programmable controller that automatically activates a cooling blower for defined, repeatable cool-down and reproducible dosimeter readings.
- ✓ Automatic rapid cooling — CC-T1 controller triggers the cooling blower on a set schedule
- ✓ 400 °C, compact 3 L chamber — sized for TLD chips and small samples
- ✓ Horizontal forced-air circulation — even heating and cooling
- ✓ Configured to order — lead time on request; install & support included
Made to order
· Lead time: configured to order — request current lead time. Install and support included.What our customers say
“Harry and team were professional, effective communicators as we set up the order, then they executed quickly and produced an amazing product for us at a very competitive price. Am looking forward to our next print w Additive Plus!”
“Great 3D printing service and the resin parts look super smooth and clean. Really happy with how everything turned out!”
“Harry was very professional and helped me out with my 3D printing needs and explained what options I have in terms of filaments such as PEEK. Highly recommended.”
“I needed a 3D enclosure printed urgently in a specific time period, they did great!”
Common questions
Don't see yours? Email [email protected] — NDA on request, typical reply within 4 hours.
What oxygen level can the HTMA reach, and how?
What temperature grades and chamber sizes are available?
Can it heat-treat metal AM parts without oxidation?
Is automatic gas control and oxygen monitoring standard or optional?
How does the HTMA compare to a vacuum furnace for stress relief?
What gas supply and infrastructure does it require?
What lead time, installation and support come with the oven?
Does Additive Plus help validate the heat-treatment cycle?
Place your order, or talk to an engineer first
Order Carbolite Gero HTMA Controlled Atmosphere Oven – Up to 700°C | 28–1000 L direct, or talk to materials engineer