Free U.S. shipping on orders over $200 · Mutual NDA standard before any file review.
Talk to an engineer →
On backorder
With every system
- Configuration & install support we spec the temperature grade, controller and safety package to your process
- US-based service & spares Carbolite Gero calibration, parts and support handled locally
Furnances, Laboratory Ovens
Carbolite Gero LHT High-Temperature Laboratory Oven – 400–600°C | 30–120 L
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
Price held 7 days after order.
Install + training included
Tailored service plan
What your lab lead actually checks
What your lab lead actually checks
Bench high-temperature heat to 600°C
LHT4–LHT6 cover 400, 500 and 600°C on the bench. A heavy-duty convection fan and low-thermal-mass insulation give fast, ±5°C-uniform heating, a brushed stainless interior resists corrosion, and the oven is rated for continuous operation.
An applications engineer on the line
Questions on soak temperatures, whether your process tolerates air, or which grade and size to pick? Our engineers run heat treatment in-house at AO Metal. Sub-4h reply, NDA standard.
400–600°C
Max temperature
30 / 60 / 120 L
Chamber volumes
±5°C
Uniformity
R38 PID
Controller
About this product
The Carbolite Gero LHT is a high-temperature laboratory oven built in three maximum-temperature grades — 400, 500 and 600°C — and three bench-mounted sizes of 30, 60 and 120 litres. A heavy-duty convection fan gives good uniformity, low-thermal-mass insulation gives a fast response and high energy efficiency, and a corrosion-resistant brushed stainless-steel interior stands up to routine lab use. The LHT is rated for continuous operation and driven by an R38 PID controller, with programmable controllers, over-temperature protection and a viewing window available as options. It bridges the gap between a 300°C lab oven and a full industrial high-temperature oven.
Why engineers choose the LHT
Bench-scale high-temperature heating to 600°C, rated for continuous duty — figures below are from the Carbolite Gero datasheet.
Three temperature grades
LHT4 (400°C), LHT5 (500°C) and LHT6 (600°C) — high-temperature heat treatment on the bench without stepping up to a full industrial oven.
Three bench sizes
30, 60 and 120 L chambers with two multi-position shelves — a compact footprint that still fits meaningful sample loads.
Fast response, continuous duty
A heavy-duty convection fan and low-thermal-mass insulation give quick heat-up and even temperature, and the LHT is rated for continuous operation.
R38 PID + options
R38 PID control as standard, with upgraded multi-segment programmers, over-temperature protection, viewing window and variable-speed fan available.
How Additive Plus delivers it
Configured to order, installed and validated by engineers who run heat treatment in-house.
Step 01
Configure to your process
Pick temperature grade (400–600°C), chamber size (30, 60 or 120 L), controller and options — over-temperature protection, viewing window, variable-speed fan, spares kit.
Step 02
Install & support
US-based delivery and setup, operator guidance, and Carbolite Gero spares and service handled locally.
Step 03
Validate your cycle
We help set ageing, tempering, debind pre-heat or drying temperatures and ramp rates for the samples and parts you process.
Temperature grades & chamber volumes
| Model | Max temp | Available chamber volumes |
|---|---|---|
| LHT4/x | 400°C | 30, 60, 120 L |
| LHT5/x | 500°C | 30, 60, 120 L |
| LHT6/x | 600°C | 30, 60, 120 L |
Minimum operating temperature is approximately ambient +60°C. Full per-model dimensions, shelf loading, recovery times and power ratings are in the Specifications tab.
Typical applications
Where a bench high-temperature oven earns its place in a lab and AM workflow.
Ageing & tempering
Small-batch age-hardening and tempering in air
Debind pre-heat & drying
Low-temperature debind, high-temperature drying
Sample heat treatment
Continuous-duty conditioning up to 600°C
High-temperature curing
Coatings, resins and adhesives above 300°C
Materials & process R&D
Bench thermal trials up to 600°C
Not sure the LHT is the right oven?
If you need lower temperature, production-scale capacity or a controlled atmosphere, a sibling Carbolite Gero oven may fit better.
Lower temp / more sizesPF Laboratory OvenView oven →
Production-scale high tempHT Industrial OvenView oven →
Need inert atmosphereHTMA Atmosphere OvenView oven →
Production-scale high tempHT Industrial OvenView oven →
Need inert atmosphereHTMA Atmosphere OvenView oven →
Tell us your target temperature, sample type and batch size — and whether the process tolerates air — and our applications engineer will confirm the right LHT grade and size. Configurations are priced per specification.
Why source through Additive Plus
- AM heat-treatment expertise — soak temperatures, ramp rates and atmosphere guidance for the alloys and parts you process, not just oven delivery.
- In-house heat treatment at AO Metal — we run post-processing daily and can validate a cycle before the oven ships.
- US-based support and consumables — Carbolite Gero service, spares and calibration handled locally.
- Sub-24h engineer response — on every enquiry, with leasing and financing available.
| Brand | Carbolite Gero |
| Models | LHT4, LHT5, LHT6 |
| Max temperature | 400 / 500 / 600°C |
| Chamber volumes | 30 / 60 / 120 L |
| Temp uniformity | ±5.0°C |
| Min temperature | Ambient +60°C |
| Interior | Brushed stainless steel, continuous-duty |
| Controller | R38 PID |
Don't see your size or temperature?
Carbolite Gero ovens are configured to order across dozens of chamber sizes, temperature grades and controller options — including AMS2750F (Nadcap) and clean-room builds. Tell us your process and we'll spec the right one.
Other products teams run alongside Carbolite Gero LHT High-Temperature Laboratory Oven – 400–600°C | 30–120 L
Furnances
Carbolite Gero AX Laboratory Oven – Fan Convection Up to 250°C | 28–128 L
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
On backorder
· Lead time: configured to order — request current lead time. Install and support included.
Furnances
Carbolite Gero HTCR High-Temperature Clean Room Oven – 400–600°C | 28–1000 L
High-temperature clean room oven combining low-shedding clean-room construction with 400, 500 or 600 °C in five sizes from 28 to 1,000 L — enclosed brushless fan, particle-free seal, safe-touch double skin and standard over-temperature protection, with an ISO 14644 Class 5 option.
- ✓ Clean-room build at 400–600 °C — low-shedding insulation, enclosed brushless fan
- ✓ Five sizes, 28–1000 L — sixteen standard models
- ✓ ISO 14644 Class 5 option · over-temperature protection standard
- ✓ Configured to order — lead time on request; install & support included
On backorder
· Lead time: configured to order — request current lead time. Install and support included.
Furnances
Carbolite Gero PF Fan Convection Laboratory Oven – Up to 300°C | 28–910 L
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
On backorder
· Lead time: configured to order — request current lead time. Install and support included.
Furnances
Carbolite Gero HT High-Temperature Industrial Oven – 400–700°C | 28–350 L
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
On backorder
· Lead time: configured to order — request current lead time. Install and support included.
Furnances
Carbolite Gero LGP Large General Purpose Industrial Oven – Up to 700°C | 500–13,820 L
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
On backorder
· Lead time: configured to order — request current lead time. Large-format install and training included.
Furnances
Carbolite Gero TLD Rapid Cooling Oven – 400°C | Thermoluminescent Dosimeter Annealing
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
On backorder
· Lead time: configured to order — request current lead time. Install and support included.
Furnances
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
On backorder
· Configured to order — request lead time
Accessories APSX
Dryer Oven
General purpose oven for heating the plastic pellets up to 437° F.
From $900
Add to cart
In stock
From teams running Carbolite Gero ovens
Unedited feedback from labs and production floors.
★★★★★
Temperature uniformity held within spec across the whole chamber — our heat-treat sign-off stopped being a fight.
DR
Daniel R. Process Engineer · Aerospace
★★★★★
Configured to order meant the exact controller and over-temperature setup we needed, and install was handled end to end.
PS
Priya S. Lab Manager · Materials R&D
★★★★★
Compact bench footprint but it holds 600°C for our long ageing runs without complaint. Exactly what the lab needed.
MT
Marcus T. R&D Scientist · Materials science
Common questions
Don't see yours? Email [email protected] — NDA standard, typical reply within 4 hours.
What temperatures does the LHT laboratory oven reach?
The Carbolite Gero LHT is built in three grades: LHT4 (400°C), LHT5 (500°C) and LHT6 (600°C). It reaches temperatures above a standard 300°C lab oven while keeping a compact bench footprint. Temperature uniformity is ±5°C and minimum operating temperature is about ambient +60°C. It is an air-atmosphere oven — for oxidation-sensitive work needing an inert atmosphere, the Carbolite Gero HTMA controlled-atmosphere oven is the better choice.
What chamber sizes are available?
The LHT comes in three bench-mounted sizes: 30, 60 and 120 litres, each available across the 400, 500 and 600°C grades. Every unit has two multi-position shelves; heavy-duty reinforced base and shelves can be specified for denser loads. It is a compact oven that still handles meaningful sample volumes. Our applications engineer will help match the size to your work.
Is the LHT rated for continuous operation?
Yes. The LHT is suitable for continuous operation, which makes it a good fit for long soaks, ageing runs and processes that run around the clock. Low-thermal-mass insulation gives fast response and energy efficiency, and the heavy-duty convection fan maintains uniformity. For unattended long-duration cycles we recommend adding over-temperature protection to safeguard the load and the oven.
What controller does the LHT use and can I program cycles?
The LHT ships with the R38 PID controller for single-setpoint control. For programmed multi-segment ramps, soaks, data logging and digital communications, a range of upgraded controllers and programmers can be specified at time of order — useful for controlled heat-treatment cycles. Additive Plus will help you choose the right controller for your application, from simple set-and-hold to multi-step ramp/soak profiles.
Can the LHT be used for metal AM stress relief or ageing?
Yes, for small-batch work with alloys and cycles that tolerate an air atmosphere. At up to 600°C the LHT handles ageing, tempering and stress relief of many metals on the bench. Oxidation-sensitive alloys such as titanium should be treated under inert gas — for those, the Carbolite Gero HTMA controlled-atmosphere oven holds oxygen down to 50 ppm. We run heat treatment in-house at AO Metal and will advise which oven suits your alloy.
What options are available on the LHT?
Options specified at time of order include upgraded controllers and multi-segment programmers, over-temperature protection, a viewing window, variable-speed fan, cable entry ports, floor stands and stacking frames with vent, a routine spares kit, an air-exhaust fan (which may alter achievable uniformity) and heavy-duty reinforced base and shelves. Tell us your process and we will configure the LHT to match.
What is the lead time and does Additive Plus install it?
The LHT is configured to order, so lead time depends on the grade, size and options chosen — request a current quote and we will confirm it. Additive Plus handles US-based delivery and setup, provides operator guidance, and coordinates Carbolite Gero spares, service and calibration locally. Because we run heat treatment in-house at AO Metal, we can help validate an ageing or drying cycle on your samples before the oven ships.
Place your order, or talk to an engineer first
Order Carbolite Gero LHT High-Temperature Laboratory Oven – 400–600°C | 30–120 L direct, or talk to materials engineer