Walk-In Stability Test Chambers

Pharmaceutical, biologic, and medical device products only stay approved as long as their stability data holds up, and stability data is only as good as the chamber it was generated in. Stability test chambers that drift out of tolerance, lose humidity control, or fail during a multi-year study can force a company to repeat an entire program at significant cost and delay. SCS builds walk-in stability chambers engineered to hold ICH-compliant conditions for the life of a study, so the data your team generates today still holds up under an FDA audit years from now.

SCS has more than 50 years of experience engineering and manufacturing walk-in stability test chambers for major pharmaceutical, biotech, and medical device companies worldwide.

That depth of experience, not just in fabrication but in the regulatory requirements behind the equipment, is what separates a chamber that passes qualification from one that merely holds temperature.

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Custom Designs to Fit Your Needs

Features of your Stability Chamber

The custom walk-in stability chambers we supply are designed for a number of different pharmaceutical areas, including long-term, accelerated and photostability studies. For flexibility and versatility, we can design and build single-compartment to multi-compartment stability chambers to accommodate multiple concurrent studies.

We are highly experienced in designing and manufacturing stability chambers to the specifications generally required by most pharmaceutical companies: 25°C, 60% relative humidity and/or 40°C, 75% relative humidity. However, we can design your walk-in drug stability chamber to nearly any temperature or humidity level you require, with constant, uniform controls in place for accurate testing.

Long-term stability studies, run at real-world storage conditions over 12 to 24 months or more
Intermediate studies at 30°C/65% RH, used when a product shows significant change at accelerated conditions
Accelerated stability studies at 40°C/75% RH to predict shelf life in a fraction of the time
Photostability chambers built to ICH Q1B light exposure requirements

ICH Climatic Zones and Storage Conditions

Regulators divide the world into four climatic zones based on the temperature and humidity a drug product will actually encounter in the field, and your stability program needs to reflect the zones you're registering in.

Zone I (temperate): 21°C / 45% RH
Zone II (subtropical, includes the U.S. and most of Europe): 25°C / 60% RH
Zone III (hot and dry): 30°C / 35% RH
Zone IVA (hot and humid): 30°C / 65% RH
Zone IVB (hot and very humid): 30°C / 75% RH

ICH is in the process of consolidating the Q1A through Q1F stability guidelines into a single Q1 guideline, with a final version expected later this year. Whichever version of the guideline your quality team is working from, SCS builds each stability chamber to the exact zone conditions your regulatory strategy requires, rather than forcing your protocol to fit a fixed set point.

Precision Uniformity and Chamber Mapping

A stability chamber is only as good as the consistency of the air inside it. Hot or humid pockets near doors, corners, or racking can quietly push a study out of specification long before anyone notices on the chart recorder.

SCS designs stability chambers to tight uniformity tolerances, and we support the temperature and humidity mapping studies your quality team needs to demonstrate that every point inside the chamber, fully loaded, stays within the range your protocol requires. That mapping data becomes part of the Performance Qualification package auditors will ask to see.

Qualification & Quality Assurance for Walk-In Stability Test Chambers

Government regulations often require documentation related to the testing facilities used in the research and manufacture of new pharmaceuticals.

To provide complete quality assurance, we can provide a full validation of your stability room, including:

Installation Qualification: to confirm all equipment is documented and installed according to specifications
Operations Qualification: to verify all controls, alarms, and tolerances function as intended
Performance Qualification: confirms that the stability chamber meets the operating set points as specified and that temperature and humidity is controlled within specified parameters

Scientific Climate Systems is your go-to stability test chamber manufacturer, and we are also a leading source for temperature chambers, humidity chambers, and cold cleanrooms.

The walk-in stability chambers supplied by Scientific Climate are the standard of excellence within the pharmaceutical industry.

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Continuous Monitoring and Data Integrity

A multi-year stability study is only as trustworthy as the record of what actually happened inside the chamber while it ran. SCS-supplied controls support continuous data logging, audio and visual alarming, and audit trail records built to support 21 CFR Part 11 electronic record requirements, so a temperature excursion is caught and documented the moment it happens instead of being discovered months later during a data review.

We also design in redundancy a stability study depends on: battery and generator-backed alarm systems, remote notification, and, where required, standby refrigeration, so a power blip doesn't put months of study data at risk.

Built for Reliability: Construction and Engineering

Every stability chamber SCS builds uses airtight, modular wall, floor, and ceiling panel construction with a minimum R-30 insulation value, which is what allows the chamber to hold a tight temperature and humidity set point instead of chasing it. Refrigeration, humidification, and dehumidification systems are sized specifically to the chamber's volume and product load, not pulled from a generic catalog spec.

Because the panels are modular, a stability chamber can also be relocated or expanded as your study volume grows, without a full rebuild.

Applications Beyond Pharmaceuticals

Stability testing isn't limited to drug substances and drug products. SCS builds stability chambers for pharmaceutical companies running ICH-compliant drug stability programs, and for medical device manufacturers validating shelf life and packaging integrity under real-world storage conditions. Biologics, nutraceuticals, and consumer health products face many of the same shelf-life and regulatory pressures, and the same chamber design principles apply.

A Full Line of Environmental Testing Equipment

Scientific Climate Systems is your go-to stability test chamber manufacturer, and we're also a leading source for temperature chambers, humidity chambers, and cold cleanrooms. The walk-in stability chambers supplied by Scientific Climate Systems are the standard of excellence within the pharmaceutical industry.

Ongoing Support After Installation

A stability chamber's validated status doesn't end at installation. Our Preventative Maintenance Programs keep your chamber calibrated, your sensors accurate, and your requalification documentation current, so an out-of-tolerance excursion doesn't jeopardize an active study.

For critical applications, expedited delivery can be accommodated. These same high standards are also applied with our environmental test chambers.

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Frequently Asked Questions

What are the ICH climatic zones, and which one should my stability chamber be built for?

ICH divides the world into climatic Zones I through IVB based on the temperature and humidity a product will realistically be exposed to in storage and distribution, ranging from 21°C/45% RH in temperate Zone I to 30°C/75% RH in the hot, humid conditions of Zone IVB. Which zone (or zones) you need to test in depends on where you plan to register and distribute the product, not just where the chamber is physically located. SCS builds each stability chamber to the specific zone conditions your regulatory strategy calls for.

What's the difference between long-term, intermediate, and accelerated stability testing?

Long-term studies run at real-world storage conditions, typically 25°C/60% RH, for 12 to 24 months or longer, and they establish the actual shelf life used on product labeling. Accelerated studies run at elevated stress conditions, typically 40°C/75% RH, over about 6 months to predict how a product will degrade over time much faster than a long-term study allows. Intermediate testing, usually at 30°C/65% RH, is required when a product shows "significant change" under accelerated conditions, bridging the gap between the two.

How is temperature and humidity uniformity verified in a walk-in stability chamber?

Uniformity is verified through a mapping study: calibrated data loggers are placed throughout the chamber, including corners, near doors, and at different rack heights, and readings are recorded over a set period while the chamber runs fully loaded. The results confirm that every point in the chamber stays within the tolerance your protocol requires, not just the reading at the control sensor. This mapping data is a standard part of the Performance Qualification package regulatory auditors expect to review.

What happens if a stability chamber loses power or a sensor fails during a study?

Without redundancy built in, a power interruption or a failed sensor can force a company to discard months or years of stability data and restart the study. A properly engineered stability chamber addresses this with battery or generator-backed alarm systems, remote notification so staff are alerted immediately rather than at the next scheduled check, and, for critical applications, standby refrigeration capacity. Continuous data logging also means that even a brief excursion is documented precisely, which lets your quality team assess the impact rather than assume the worst.

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