Environmental reliability testing
With well-designed reliability testing the behavior of products and materials under different operation conditions can be verified, and life-cycle of the products can be estimated. We work in a very wide range of reliability testing (accelerated life testing) techniques.
We offer you the whole process:
*Test and test setup design
*Design and manufacturing of test structures
*Analysis of test data
We are passionate about helping you to improve the reliability of your products. If you need to prove to yourself or to your customers that your product is suitable for certain environments, let us help!
In our testing laboratory it is possible to study the functionality, aging and failures of components, interconnections, materials and whole devices in different accelerated environments.
Temperature – high, low or temperature change – has huge effect on the reliability of products. High temperature accelerates chemical reactions and ages materials. Low temperature may cause the materials to become brittle. Thermal cycling adds the effect of stresses caused by materials having different coefficient of thermal expansion (CTE) values. Examples of our test methods:
*Thermal cycling and thermal shock cause cyclic thermomechanical stresses to interconnections, components and devices and is widely used with electrical devices. Thermal shock, with quicker temperature change rate, causes also thermal gradients.
*Thermal aging can be used to analyze aging and behavior of devices and materials under high temperatures for short or long time periods.
Humidity impairs performance of many polymers and in electrical structure may cause for example swelling, delamination, corrosion and popcorning. Humidity testing often combines elevated temperature and humidity conditions, in which temperature accelerates the effect of humidity. Products are, for example, often exposed to similar environments during transportation and storage. Examples of our test methods:
*Constant temperature and humidity testing is used to study the effect of humidity on structures and materials. One widely used test is 85/85 -test (85°C, 85% relative humidity).
*Humidity cycling studies the effect of varying humidity on structures and materials
*Condensing testing is used to study the effect of condensation on structures and materials
*HAST testing is a pressure cooker test in which very high temperature and humidity levels are used
Mechanical testing studies how mechanical stresses affect structures. Typical stresses are impact by dropping (drop test) and vibration which we can combine with humidity testing.
We are currently designing a dynamic bending tester for flex structures.
Corrosion testing is ideal for devices in corrosive environments, such as marine or heavily polluted areas. Examples of our test methods:
*Mixed flowing gas testing is used to imitate atmospheric corrosion by various corrosive gases. We can test H2S, SO2, NO2 and Cl2 gases and simultaneously control temperature and relative humidity.
*Salt spray testing is used to study the corrosion caused by salty environments. Examples of these are road salt or human sweat. Testing can be conducted with several different constant and cyclic tests and salt levels.
Dust testing can be used to study how different impurities affect to electronics and to study the effects of settling dust. We have the possibility to use several different dusts including electrically conductive dusts and corrosive dusts.
Electrical testing can be used to study how changes in supply voltage can affect the reliability of, for example, power electronics. These methods include under and overvoltage, voltage fluctuation and intermittent power failures. We can also combine these with other environmental tests.
We monitor the behavior of your product in real-time during testing when it is possible. This gives a much better view to the behavior of the product in certain environment compared to functionality testing at room condition in between tests. Real-time monitoring often provides crucial information about early signs of failure and indication about failure mechanisms.
In use conditions, your product seldom faces a single stress at a time. Therefore, combinatory testing can be used to combine several environments. The testing can be performed with sequential testing (exposing the same tested structures first to one environment and then to another) or simultaneous testing (combining several environments at the same time). The idea behind combinational testing is that stresses may significantly affect and accelerate each other. Therefore, the results of combinational testing are often more severe than the sum of two separate stresses.
To learn more about our expertise areas and services we can offer, please contact:
Janne Kiilunen, Mobile: +358 50 375 7963
Juha Pippola, Mobile: +358 40 778 8023