Environmental Stress Screening – The Benefits of EES Testing

Environmental stress screening, or ESS, is a process used to identify potential problems in products or systems before they are put into service. By subjecting products or systems to conditions that simulate the real-world environment, ESS can uncover weaknesses that would not be apparent during normal operation. The levels of stress applied during ESS testing often exceed the stress those products would normally experience to precipitate failures and reduce test time.

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ESS Benefits


ESS is often used on products expected to operate for long periods without failures, especially electronics such as medical devices, aerospace components, or military equipment. By testing products under extreme conditions, manufacturers can be confident that their products will perform as intended when they are used. By identifying potential problems early on, ESS can save manufacturers time and money by preventing costly recalls or repairs down the line. For some products, environmental stress testing is a legal or industry requirement. Let’s take a look at some of the most common types of ESS.


Thermal Cycling Testing


Thermal cycling is one of the most common types of environmental stress screening and is often used on electronic components. It involves subjecting a product to extreme hot and cold temperatures to replicate the temperature changes it would experience in real-world use. Thermal cycling can identify potential problems with seals and gaskets, solder joints, plastics, and other materials that could cause the product to fail. Products commonly tested using thermal cycling ESS include electronics, automotive parts, and medical devices.


Thermal cycles typically occur when:

  • A product is powered on and off in a controlled environment.
  • A product experiences slower outdoor temperature changes from morning until night.


The test conditions will vary depending on the item being tested. Typically they are performed in a chamber that controls the number of cycles, dwell times, transfer times, or ramp rates.


Thermal Shock Testing

This type of environmental stress screen goes beyond thermal cycling. Thermal shock and cycling testing both expose products to extreme temperatures. However, the transition from one to the other is accelerated with shock testing.


Thermal shock can occur when:

  • A product is transferred from an inside temperature-controlled environment to extreme outside temperatures. 
  • Turning on equipment that has been stored outside in extreme arctic-like temperatures.
  • Equipment experiences abrupt or significant changes in internal power.
  • A product is transported from a high-temperature ground environment to a high-altitude environment. 


Thermal shock testing can be done in two ways. It is typically performed in a dual compartment chamber, with one compartment for hot temperatures and the other for cold. Products sit in a carriage that shuttles them between the hot and cold compartments within seconds, causing the product to experience thermal shock. When testing larger items, a single compartment chamber capable of performing rapid temperature changes is used. 


Vibration Testing


Vibration testing is a type of environmental stress screening used to test products for potential problems that could lead to failures during normal use. Vibration testing subjects products to extreme vibrations to find flaws that could go undetected during normal operation. This helps to ensure that products are of the highest quality possible before being released to the public. 


Vibration testing is commonly used on electronic devices, electrical components, and mechanical parts. By subjecting these products to extreme vibrations, manufacturers can find potential problems that could lead to failures during normal use.


Vibration damage can occur from:

  • Vibration and shock stress during shipping.
  • Mechanical stress from application and usage throughout the product’s lifespan.


Environmental stress screening for vibration requires temperature testing, electrodynamic vibration testing, or both. The product being tested is placed in an environmental chamber and monitored while experiencing vibrations, temperature changes, and other stimuli. Vibration testing is used to reveal weaknesses or defects in the product’s construction.

ESS Testing

Environmental Stress Screening by Quality Testing Services


Located in Huntington Beach, Quality Testing Services began as a HALT/HASS testing facility. With more than two decades of experience, it has become the industry leader for product testing in Southern California.


We have expanded over the years and now offer a wide range of product testing services including, ESS, Vibration and Shock Testing, Temperature and Humidity Testing, Life Testing, and much more. While we may not be the largest product testing company in the industry, we believe our attentiveness and flexibility set us apart from other companies. We meet with our clients to get a complete understanding of their testing needs and develop a relationship with them. If their product needs special equipment for testing that isn’t standard, we will do our best to fabricate the equipment needed.


Have a product that needs to be tested? Contact us for a detailed quote or more information on our testing services.



Comprehensive Guide to Different Methods of Product Testing

No matter what products your company manufactures, you can benefit from product testing. Testing your products during various stages of the development process helps to ensure product quality, reduce development and manufacturing costs, increase customer satisfaction and reduce the time needed for product development. It can help you to evaluate designs, solve product problems, confirm compliance with regulations and ensure product safety. Continue reading

Product Testing Checklist

Product Testing Checklist

Companies want to ensure that their products meet their quality standards. To get this assurance, they must perform tests of their products’ safety, durability and functionality. These tests involve subjecting the product to a range of stresses, impacts and temperatures. If the product is electronic, it must also be capable of fulfilling specified performance capabilities.

Product testing can also help improve a company’s reputation among customers and increase their confidence in its products. Customers will be more likely to trust a product that the company has thoroughly tested. Testing also helps ensure the quality of your products, improving customer satisfaction. Continue reading

Who Should Do Product Testing?


Product testing can provide benefits to companies in nearly any industry. Some of the benefits of product testing include reduced product development time, improved product quality, reduced costs, and increased consumer confidence in your products.

What exactly is product testing, and why is it important for businesses? The term refers to conducting tests to evaluate the properties or performance of a given product. Companies can use product testing to evaluate potential designs, ensure product safety, verify compliance with regulations, solve product problems, and more. It’s useful to conduct product testing at various stages of development including the ideation, development, and production phases.

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Should You Do Product Testing? Why Product Testing Is Important

Should You Do Product Testing Why is Product Testing Important

Your products are a reflection of an experience you’re trying to convey to your customers. Before you unveil something new to the world, make sure you have confidence that it will perform flawlessly.

Modern businesses are becoming more innovative and prevalent than ever before. This realization means competition is growing at a very rapid pace, which makes it essential that a company that wishes to compete offers top-tier products that rival anything else on the market, as well as making use of things like paid adverts, creating the best content possible, simply changing their website from http to https, having read this blog post for reference as to why this is a good idea, to ensure they get their name out there. One way to ensure the development of a superior product before it reaches potential customers is by performing extensive tests and quality checks before hitting the shelves. Continue reading

Product Testing Process: How Does It Work?

Product Testing Process

All companies want to ensure their products work correctly and meet their standards for quality. This applies to new products that are under development and existing products that must undergo quality testing. Product testing is a critical part of the product development process and is sometimes required legally or to work with another company. So, how exactly does product testing work?

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HALT vs. ALT: Which Testing Technique Should You Use?

Product testing is an essential part of manufacturing. Not only is it important to figure out if your product will be fully functional, but you may find yourself needing to determine when and how the product will fail or malfunction.

When it comes to stressing your product to determine its limits, you’ll probably find yourself turning to either highly accelerated life testing (HALT) or accelerated life testing (ALT). The question comes down to which of the two methods is better for your particular product.

With the two acronyms sharing three letters, it’s no wonder there’s some confusion surrounding the differences between HALT and ALT procedures. The two methods accomplish different objectives, and they can both be highly beneficial when you work with the right testing service. Functioning either separately or in tandem, HALT and ALT product testing can help you determine the longevity and the ultimate success of your product down the line.

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HALT/HASS Testing Guide: What Is HALT/HASS Testing?

Creating a reliable product that is easily manufactured, handled and shipped that is also of service to your customers for a sufficient amount of time isn’t an easy task. Innovation is at an all-time high and customers expectations are only getting higher. The market demands manufacturers to release new high-quality products that last at an increasingly higher rate.

Traditional test methods often take several weeks or upwards of many months to find any lackluster components of a product’s design. Even then, results are not guaranteed. Identifying these inferiorities is essential so that they can get fixed before they become expensive field issues.

Newer methods of product reliability testing can drastically shorten the amount of time it takes to find these weak points and can reach completion in as little as a couple of hours. Among the highest rated testing methods are HALT and HASS testing. Understanding what HALT/HASS testing is and applying these types of testing will allow improved product reliability that frees up time for other endeavors, and in turn, increases the revenue your company will be able to bring in.

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