HSHLD® Combined Dry Gross Leak, and Helium Fine Leak
ORS Will Identify the Size of Your Leak
ORS utilizes a wide range of methods for identifying fine and gross leaks. We recommend that packages that pass the fine leak test also be tested for a gross leak, as many can pass the former and fail the latter. Identifying, locating, and addressing leaks is essential for hermetically sealed packages if you want to avoid contamination, damage and device failure.
Fine Leak Testing
ORS performs seal testing per Mil-Std 883 method 1014 conditions A1 and C1, Mil-Std 750 method 1071 conditions H1 and C, Mil-Std 202 method 112 conditions C, D, A and E, and client specific requirements. Testing is also performed per Telcordia GR-1221-CORE and GR-468-CORE for passive and active devices.
Fine leak testing is used to locate fractures in hermetic seals and can be used to test an individual seal’s integrity or evaluate the seal process for your hermetic devices.
In most cases, the device in question is preconditioned in a depressurized container. However, some devices may not need to be pressurized if they’ve been sealed with a known concentration of helium. Helium atoms are small and therefore able to penetrate fine cracks in packages. As helium leaks from the pressurized device, the leak rate is measured to determine the presence of a fine leak.
Fine leak testing is available for other gases as needed. ORS provides specialized leak testing for gases such as Argon, CO2 and Acetic Acid. Low leak rates of these gases can be measured via mass spectrometry.
Gross Leak Testing
Gross leak tests function very differently from fine leak tests. As with the fine leak tests, the device in question is preconditioned in a pressurized container that is filled with a fluorocarbon with a low boiling point. This substance is known as the Detector. Under the pressure, the Detector fluid may penetrate the device.
After preconditioning, the device is then submerged in another tank with a second fluorocarbon. This substance has a higher boiling point and is known as the Indicator. This tank is set at a high temperature of about 125°C. While the Indicator fluid remains inert due to its high boiling point, any Detector fluid that penetrated the cavity of the device will begin to boil. This leads to elevated pressure inside the device and results in a bubble stream that flows from the leak site.
In some cases, the device may not need to be pressurized and is instead submerged directly in the Indicator fluid.