Pharmaceutical chemistry — low-temperature drying of intermediates and extracts
Below the decomposition window, no oxidation skin
Low-temperature drying under <133 Pa
Vacuum Drying Ovens
A vacuum drying oven does with pressure what a conventional oven does with temperature. Pull the chamber below 133 Pa and solvents boil at a fraction of their atmospheric boiling point — so a heat-sensitive extract dries at 40°C instead of degrading at 100°C. Under vacuum, powders stay put, oxygen cannot oxidise what it cannot reach, and solvent vapours leave through the pump instead of your samples' neighbours. WSHLab builds the RZF bench top vacuum oven (20L to 210L, horizontal) and the RZFL vertical vacuum oven (50L to 210L, floor-standing). Both hold <133 Pa with a silicone seal and wrap-around heating, run RT+10°C to 250°C, and carry a digital vacuum gauge on the control panel. A nitrogen purge port is standard, turning the chamber into a vacuum nitrogen oven for inert-atmosphere work. The vacuum heat treatment oven principle is simple; keeping it sealed for years is the hard part. That is why we use a wrap-around heater band instead of point elements, a thick silicone gasket, and a double-layer glass door so you can observe a run without breaking vacuum.
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WSHLAB Benchtop Vacuum Drying Oven
- Model range
- RZF-6020 / 6050 / 6090 / 6210 (A/B/C configurations)
- Capacity options
- 20L (600W) · 50L (1400W) · 90L (2000W) · 210L (3000W)
- Temperature range
- RT+10°C to 250°C
- Ultimate vacuum
Price on request -
WSHLAB Vertical Vacuum Drying Oven
- Model range
- RZFL-6050 / 6090 / 6210 (B/C configurations)
- Capacity options
- 50L (1400W) · 90L (2000W) · 210L (3000W)
- Temperature range
- RT+10°C to 250°C
- Ultimate vacuum
Price on request
TECHNICAL DATA
Inside a WSHLab vacuum oven
A sealed stainless chamber, a wrap-around heater band, a thick silicone gasket and a double-layer glass door — engineered to hold vacuum for years, not just on delivery day.
Vacuum Drying Ovens
View ProductWSHLAB Vertical Vacuum Drying Oven
- Model range
- RZFL-6050 / 6090 / 6210 (B/C configurations)
- Capacity options
- 50L (1400W) · 90L (2000W) · 210L (3000W)
- Temperature range
- RT+10°C to 250°C
- Ultimate vacuum
- <133 Pa with a matched two-stage pump
- Controller
- PID with digital vacuum gauge, over-temp alarm, memory and power-recovery
- Chamber
- B: 201 stainless / C: 304 stainless, rounded corners
- Interior dimensions (W×D×H)
- 50L 370×415×345 · 90L 450×450×450 · 210L 600×550×650 mm
- Exterior dimensions (W×D×H)
- 50L 540×610×1240 · 90L 700×640×1570 · 210L 760×780×1780 mm
- Shelves (standard / max)
- 50L 2/2 · 90L 2/3 · 210L 3/3
- Power
- 220V 50Hz
- Certification
- CE, ISO 9001, RoHS
- Heating Method
- Vacuum
- Capacity
- 210L · 50L · 90L
- Voltage
- 220V/50Hz
- Chamber Material
- 304 Stainless
- Control Type
- LED Digital
- Max Temperature
- 250°C
Applications
Where vacuum ovens change the result
Any process where heat, oxygen or airflow would alter the sample is a vacuum process.
Electronics and semiconductors — component and wafer-scale moisture removal
Dust-free, oxidation-free drying before encapsulation
Materials science and battery R&D — powders and films under inert atmosphere
Standard nitrogen purge port, <133 Pa
Healthcare and agricultural research — gentle drying of biological samples
Vacuum sterilizer cycle for glassware at 250°C
PERFORMANCE & SELECTION
What is a vacuum drying oven?
A vacuum laboratory oven is a sealed chamber that heats under negative pressure. Lowering the pressure lowers the boiling point of the solvent in your sample, so the same drying job happens at a lower temperature — or the same temperature finishes faster. The chamber is not vented; vapour exits through the vacuum line, which also removes the thermal explosion risk that comes with solvent-laden air.
- <133 Pa ultimate vacuum with a matched pump
- RT+10°C to 250°C, PID controlled with over-temp alarm
- Digital vacuum gauge on the control panel
- Wrap-around heating keeps the chamber walls above the dew point of the vapour
CONFIGURATION & COMPATIBILITY
Benchtop vacuum ovens: the RZF series
The RZF horizontal vacuum oven spans 20L to 210L in a benchtop chassis with a wide glass door. It is the standard choice for small batches of heat-sensitive, easily decomposed material — pharmaceutical intermediates, electronic components, delicate powders.
- RZF capacities: 20L, 50L, 90L, 210L — heaters 600W to 3000W
- Chamber options: galvanised, 201 stainless, 304 stainless
- 2-3 shelves; 210L takes three for tall loads
- Small vacuum oven footprint: exterior from 460 mm wide
IDENTIFICATION & TRACEABILITY
Clear Product Identification & Specification
Product names, model numbers, SKUs and option identifiers keep quotations, orders and internal records aligned.
- Product and model identification
- Option-specific SKU information
- Consistent quotation specifications
PRODUCT IDENTIFICATIONVacuum Drying Ovens
- Catalog
- Laboratory equipment
- Products
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- Selection
- Specification-led
Traceability
Traceability from gasket to serial number
Gasket lot, heater serial and leak-test data are recorded against the oven serial, so a replacement gasket matches the seal profile of the unit it goes into.
- Leak-down curve stored with the unit's factory record
- Replacement gaskets, gauges and heaters matched by serial
- Calibration certificate available for regulated laboratories
Quality system
Quality system and factory testing
Seal integrity is a leak-down test, not a data-sheet line: every chamber is evacuated and timed before shipping.
CE marked, built under ISO 9001
Vacuum leak-down test on every unit with results filed by serial
Heater band uniformity and over-temp alarm verified per unit
Door gasket inspected and torqued after the thermal cycle
Why WSHLab
Why laboratories standardise on WSHLab vacuum ovens
The same seal, the same heater band and the same controller across benchtop and vertical formats — only the footprint changes.
<133 Pa with a silicone seal that stays elastic at 250°C
Wrap-around heating — no cold walls, no internal condensation
Digital vacuum gauge standard; over-temp alarm and memory-recovery function
Double-layer glass door for safe observation mid-run
Nitrogen purge port standard for inert-atmosphere work
OPTIONS & SPECIFICATIONS
Vacuum Drying Ovens Options & Specifications
Choose the format that suits your application, workload and handling requirements.
Ultimate vacuum and leak rate, not just the gauge
Heat sensitivity of the sample
304 or 316 stainless for the solvent load
Pump matched to chamber size
Nitrogen purge for oxygen-sensitive work
| Type | Capacity / Option | Material / Specification | Suitable Application | Storage / Handling |
|---|---|---|---|---|
| Ultimate vacuum and leak rate, not just the gauge | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Heat sensitivity of the sample | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| 304 or 316 stainless for the solvent load | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Pump matched to chamber size | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
| Nitrogen purge for oxygen-sensitive work | By selected product | Product-specific configuration | Confirm with our team | Follow product guidance |
Delivery and site
Delivery, installation and commissioning
Benchtop models unpack in place; vertical models roll on casters. The pump connection is a single fitting — commissioning is minutes, not a project.
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Wooden crate; glass door protected with foam and a shipping clamp
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Match the pump before ordering — we size it to the chamber and typical load
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Fit a cold trap between oven and pump for solvent recovery
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First-run leak-down check documented in the commissioning sheet
RECOMMENDATIONS
Related Products
Products frequently compared within this catalog.
Gallery
RZF and RZFL build details
Gauges, seals and chambers across the vacuum range.
VIDEOS
Manufacturing & Quality Process
Category video library
Add category-specific video covers, titles, durations and video URLs in the Videos ACF section.
QUESTIONS & ANSWERS
Vacuum Drying Ovens: frequently asked questions
The questions buyers ask most often when specifying Vacuum Drying Ovens, answered by our technical team.
What vacuum level do these ovens reach?
Better than 133 Pa ultimate vacuum with a correctly matched two-stage rotary vane pump and clean seals. The digital gauge on the panel shows the working vacuum throughout the run.
What is the temperature range?
RT+10°C to 250°C under PID control. The wide range is the point: vacuum work usually runs well below 100°C, and the headroom is there for glassware sterilization cycles.
Do I need a vacuum pump?
The pump is optional at ordering — we supply pumps matched to the chamber size so you are not guessing at pumping speed. Any two-stage rotary vane pump of the right capacity will work.
Can I purge with nitrogen?
Yes. A gas port is standard on every RZF and RZFL, so the chamber doubles as a nitrogen-purge vacuum oven for oxygen-sensitive samples.
Is the chamber 304 or 316 stainless?
304 stainless is the standard chamber for vacuum work; 201 stainless is available as an economy option. For corrosive solvent loads, ask us about 316 options.
Get a quotation
Specify your vacuum oven with an engineer
Tell us the solvent, the temperature ceiling of your sample and the batch size. We will confirm the chamber material, pump and accessories.