Refrigerated Humidity Chamber – Freeze Thaw Chamber: Stress Testing That Actually Predicts Product Failure

Products don't fail in a lab; products fail out there in the real world, in the truck on the tarmac, in the warehouse as seasons swing between humid summer and winter ice. A refrigerated humidity chamber – freeze thaw chamber is the test equipment designed to recreate all of these harsh environments before a product ever gets into a consumer's hands. It is one of the most valuable pieces of environmental testing equipment, and for good reason.

What This Test Equipment Does

The freeze thaw chamber exposes materials to a rapid cycle between extremely cold temperatures and humidity, in order to reproduce environmental stress that would occur in years of time in a matter of days or weeks. The refrigerated humidity chamber, in turn, controls the moisture levels in addition to the temperature, since moisture can have an even more harsh effect on materials than temperature.

Why It Is So Important to Have Freeze-Thaw Cycling

Materials expand and shrink when temperatures change, and repeated freezing and thawing place great mechanical stress on sealants, protective coatings, adhesives, and composite parts. In concrete materials laboratories, the effect of freeze-thaw cycles on durability and susceptibility to such damages is continuously assessed as an important characteristic of construction materials for seasonally-changing climate conditions. Electronics companies also make use of such test procedures to identify condensation failure within sealed enclosures that cannot be detected in a steady laboratory environment.

Importance of Humidity Control during Accelerated Testing Procedures

It is not enough just to vary temperatures to see how products will perform in changing weather conditions. Moisture ingress, corrosion, and expansion of materials also strongly depend on humidity level experienced by the product. By using a correctly calibrated humidity chamber, engineers can set specific levels of relative humidity along with temperature fluctuations to create accelerated aging conditions. This is one of the reasons why most reliability tests require equipment for both freeze-thaw cycling and humidity control.

Industries Relying on This Type of Test

The automotive industry makes heavy use of freeze/thaw chambers to evaluate rubber gaskets, paint treatments, and electronics before a car goes into the market where it will be subject to various climatic conditions. Similar chambers are used by the pharmaceutical industry to perform stability tests, thus proving the viability of their products in varying temperatures in which it will travel. Construction materials tests, packaging and even food science tests all make use of this kind of chamber to determine the longevity of the product.

Things to Look For in Choosing a Freeze/Thaw Chamber

Temperature stability and accuracy of humidity are among the things that you need to consider because without it the purpose of the test will not be served. You also need to consider the volume of the chamber depending on whether you will test a large component or test several products at once.

Final Words

In all honesty, an environmental chamber that is capable of providing humidity and freeze-thaw cycles to materials under development provides manufacturers one thing which cannot be underestimated: the ability to test how their product will hold up against harsh environmental conditions without ever actually exposing it to them. This type of testing is not a luxury, but rather an essential practice within engineering.