New for 2025: Model EHS-222-L with eight-inch deeper test area

HAST (Highly Accelerated Stress Test) chambers reduce the time it takes to complete humidity testing for semiconductors. By elevating temperatures above 100°C and increasing the pressure, simulation of normal humidity tests can be made while maintaining the same failure mechanisms. Tests can be completed in days, not weeks. Our HAST systems have a modern design that's easier to use:

• Automatic humidity filling
• Automatic door lock
• A round workspace, allowing wider sample boards to be loaded
• Convenient, hermetic power-pin system for bias testing

We now offer an "Air HAST" modification for faster testing of lead-free solder whisker resistance to humidity.

Features for HAST - Highly Accelerated Stress Test Chambers

Why Choose ESPEC HAST Chambers?

At ESPEC, we know that when it comes to reliability testing, there’s no room for compromise. That’s why our HAST chambers are designed from the ground up for those who demand fast, consistent, and repeatable results—whether you’re developing next-generation semiconductors or ensuring the long-term performance of advanced electronics.

We don’t just build test chambers. We build confidence. Our team is passionate about supporting engineers, quality managers, and reliability experts with technology that not only meets, but anticipates, your needs. As one of our founders once put it, “We’re not satisfied until our chambers make your job easier, your results more reliable, and your deadlines less stressful.” 

That’s the ESPEC difference—innovation, partnership, and relentless pursuit of reliability.

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Accelerate your testing—request a quote today. Standard quotes are delivered within four hours.

What is a HAST Chamber?

Highly Accelerated Stress Test (HAST) chambers are specialized environmental test chambers that simulate years of real-world humidity and bias stress in just days. By combining high temperatures (typically above 100°C), elevated humidity (up to 100% RH), and positive pressure, HAST chambers rapidly accelerate failure mechanisms in electronic components—uncovering potential issues before your products reach the field.

Typically, HAST testing is used to accelerate testing done at 85°C/85%RH. The primary consideration to stepping up to HAST would be the product’s ability to withstand temperatures over 100°C without changes in failure modes.

Think of HAST as an Instant Pot pressure cooker, where elevated temperature and pressure speeds cooking. In fact, the first HAST tests 40 years ago were done with simple pressure cookers. But repeatability and condensation issues led to the further refinement of HAST chambers.

How Does HAST Work?

• High Temperature: Exposes components to conditions well above standard operation, revealing heat-related failure points.
• High Humidity: Promotes corrosion and insulation breakdown—critical for detecting moisture-sensitive weaknesses.
• Pressure: Increases the rate of chemical reactions, speeding up aging and stress effects.

HAST vs. Traditional Humidity Testing:

Our chambers are designed to comply with global standards such as JEDEC JESD22-A110/102, IEC 60068-2-66, and AEC-Q100, ensuring your results are trusted worldwide.

Applications & Industries Served

How Our Clients Use HAST Chambers

Our HAST chambers are trusted by engineers and reliability professionals across a range of industries. Whether you’re testing the latest semiconductor devices, printed circuit boards (PCBs), MEMS, or automotive electronics, ESPEC’s chambers are designed to help you move faster, innovate more confidently, and meet strict compliance requirements.

Industries & Use Cases:

• Semiconductors: Accelerated humidity and bias testing for ICs and microelectronics.
• Automotive Electronics: Ensuring long-term reliability for critical control modules and sensors.
• PCBs & Assemblies: Identifying solder whisker formation and oxidation risks.
• Reliability Labs: Fast, repeatable qualification for new materials and designs.
• Advanced R&D: Supporting innovation in fields like IoT, aerospace, and high-performance computing.

“When we set out to design our latest chamber, we listened closely to our customers. They told us, ‘We need testing that’s not just faster, but smarter, safer, and easier to manage.’ That’s what we delivered.”

Case Example:
A leading automotive supplier used ESPEC’s Air-HAST mode to identify and mitigate oxidation issues in a next-generation sensor, reducing field failures and warranty claims by 30%.

Pain Points Solved:

• Shrinking test timelines
• Regulatory compliance headaches
• The need for repeatable, audit-ready results
• Pressure to innovate without sacrificing quality

Technical Capabilities & Features

Built for Real-World Demands

Our chambers are not merely equipped with features—they are purpose-built solutions to the everyday challenges of reliability testing.

Core Features:

• Control Modes: Unsaturated, Saturated, and Multi-mode (M/MD) for wet bulb/dry bulb control.
• Air-HAST Mode: Simulates oxygen-rich conditions to reproduce solder whisker and oxidation phenomena.
• Cylindrical Inner Chamber: Prevents dew condensation, maximizing product loading and test accuracy.
• Vessel Sizes: From compact benchtop models to the large EHS-432MA and double/quadruple pressure ranges.
• Touch-Screen Controller: Ethernet interface, countdown display, and multilingual support (EN, JP, CN, KR).
• Onboard Water Supply & Drain: Simplifies installation—no external plumbing required.
• Casters: Easy movement and flexible lab layout (except double units).
• Specimen Power Terminals: Enable bias testing with automatic shutoff during alarm events.
• Sliding Shelves and power pin options: Streamlined specimen loading and cable management.

Comparison Table: ESPEC HAST Chambers

Compliance & Global Standards

Testing with Confidence—Worldwide

Meeting global standards is more than a requirement—it is the gateway to international markets and the foundation of trusted results.

ESPEC HAST Chambers Comply With:

• JEDEC JESD22-A110/102
• IEC 60068-2-66
• EIAJ ED-4701
• JPCA-ET08
• AEC-Q100
• JEITA ED4701/001A, 100A
• JESD22-A118B
• MIL-STD-883L, IEC60068-2-14Na

Why Compliance Matters

• Meets vendor and customer quality requirements
• Ensures repeatable, auditable test results
• Accelerates time-to-market for new products

Usability, Safety, and Installation

Designed for the Way You Work

Reliability testing may be complex, but your equipment should not be. ESPEC HAST chambers are engineered for simplicity, safety, and ease of operation.

Modern Usability Features:

• Auto Humidity Fill: No manual refills, no interruptions.
• Auto Door Lock: Safety and convenience combined
• Intuitive Touch Interface: Multilingual support ensures anyone on your team can operate the system.
• Onboard Water Supply & Drain: Plug-and-play installation.
• Casters: Move your chamber where you need it.

Safety Mechanisms:

• Overheat and overpressure protection
• Interlocked door lock prevents accidental opening
• Emergency stop switch for instant shutdown

Flexible Specimen Handling:

• Sliding shelves for easy loading
• Door notches for neat cable management

Common Questions Addressed

• Can I install this chamber in a standard lab?
  Yes. Our compact models are designed to fit most laboratory environments, and onboard water tanks eliminate the need for complex plumbing.
• What if something goes wrong during a test?
  Integrated safety shutoffs and alarms safeguard both your specimens and your team.

Options & Configurations

Tailored to Your Needs

Every lab has unique requirements. That’s why ESPEC offers a wide range of options and configurations to match your specific testing demands.

Available Options:

• Sealed signal ports for sensitive measurements
• Emergency stop switch for enhanced safety
• Large, double, or quadruple chamber configurations
• Custom software integrations or reporting formats

How We Help You Choose:

Our applications engineers are available to walk you through the selection process, ensuring you get the right chamber for your unique requirements. We believe in a consultative approach.

“Let’s talk about what you’re testing, what results you need, and how we can make your process smoother.”

The ESPEC Difference: Innovation, Support, and Global Reach

What Sets Us Apart

At ESPEC, our mission is to help you “test with confidence.” We’re not just a supplier—we’re your partner in reliability.

Our Innovations:

• Air-HAST Mode: Industry-leading simulation of oxygen-rich conditions for advanced oxidation studies.
• Spike Minimization: Proprietary design minimizes humidity and temperature spikes during ramp-up and cool-down, ensuring stable, uniform test conditions.

Proven Track Record:

• Trusted by leading semiconductor, automotive, and electronics manufacturers worldwide.
• Supported by a global sales and service network, ready to assist you wherever you are.

“Our commitment is simple: Every chamber we deliver is backed by decades of experience, a passion for reliability, and a promise to support you every step of the way.”

Client Success Story:
A global electronics manufacturer reduced their product qualification time by 60% after switching to ESPEC’s multi-mode HAST chambers, freeing up resources for more innovation.

Frequently Asked Questions (FAQ)

How does Air-HAST differ from standard HAST?
Air-HAST introduces controlled oxygen into the chamber, allowing for accelerated studies of oxidation and solder whisker phenomena—critical for advanced electronics and lead-free assemblies.

Can I run bias testing in your chambers?
Absolutely. Our specimen power terminals allow for safe, reliable bias testing, with automatic shutoff if any alarm condition occurs.

What support is available after purchase?
Our global service team provides installation, training, calibration, and technical support—backed by real engineers who understand your challenges.

How do I know which model is right for me?
There are two sizes and two ranges of performance. Some test standards need the higher temperature/pressure range. Contact our applications team for a personalized consultation. We’ll help you choose based on your sample size, compliance needs, and budget.

Are your chambers easy to install?
Yes! Most models are plug-and-play with onboard water tanks and casters for easy movement.

Get a Fast Quote or Expert Consultation

Ready to move forward?

Get a quote in as little as four hours—just fill out our quick form or contact your local ESPEC representative.

Have a unique challenge or need custom configuration? Our experts are here to help.

[Contact us now] or call 1-616-896-6100.

Technical Specifications (Spec Tables)

About ESPEC: Our Commitment to Reliability

For over half a century, ESPEC has set the standard in environmental testing. Our mission is simple: empower engineers and innovators to bring safer, more reliable products to the world. We believe in partnership, innovation, and uncompromising quality.

With a global presence, a dedicated support network, and a relentless focus on our clients’ success, we’re more than a test chamber provider—we’re your partner in reliability.

Connect with us today to see how ESPEC can help you move faster, test smarter, and build products that last.

Ready to accelerate your reliability testing?

Get your personalized quote now.