HSHLD® Combined Dry Gross Leak, and Helium Fine Leak

ORS Will Identify the Size of Your Leak

ORS uses it’s HSHLD® Model 310 High Sensitivity Helium Leak Detection System to qualify your product to the latest, tighter leak rate requirements.

HSHLD® testing is able to provide both the FINE and GROSS leak test data in a single test sequence. Devices are typically preconditioned in a pressurized chamber and, after the required conditions are met, the leak rate is measured and recorded.


  • Helium Tracer Gas
  • Pressurization range: 30-95 psia (2 to 6.5 Bar absolute)
  • Minimum detection limit: <1·E-12 atm·cc/sec Helium
  • Measurement method: Batch Testing or Read and Record
  • Mil-Std 750 method 1071 condition H1, H2 and H3
  • Mil-Std 883 method 1014 condition A1, A2 and A5
  • Accurate R1 measurements verified by a 2 point linear calibration.
  • No Flourocarbons Required
  • Helium hermeticity testing can be modified to suit the testing requirements of your device. We have assisted many clients in creating a custom leak test plan based on their needs.

Use our interactive tool Howl-Mann Equation to compute the Pass/Fail (R1) criteria based on your pressurization parameters.

Expanded Fine Leak for Other Gases and Compounds

Specialized leak testing is available for determining leak rates for gases other than helium. Leak rates of various gases (i.e. Argon, CO2, Acetic Acid, Ethylene Glycol, etc.) may be measured at low leak rates utilizing a specialized mass spectrometer tuned for the particular substance of interest. Applicable standards are normally available in a wide range of leak rates.

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.

High Sensitivity Helium Leak Detection

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.

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