---
title: "Quality Assurance"
canonicalUrl: "https://mpfpi.com/faq-category/quality-assurance/"
dateModified: "2026-07-30T16:07:12+00:00"
---

Quality Assurance Archives - MPF Products, Inc.
# Quality Assurance

###  [How is a vacuum component leak rate quantified?](https://mpfpi.com/faq/how-is-a-vacuum-component-leak-rate-quantified/)

Leak rates are quantified by measuring the volume of gas flowing through a leak path per unit of time at a specific pressure differential. The industry standard unit for high-performance hermetic feedthroughs is atmospheric cubic centimeters per second (atm cc/sec of helium) or millibar-liters per second (mbar·l/s).

[Read More](https://mpfpi.com/faq/how-is-a-vacuum-component-leak-rate-quantified/)
###  [Why is helium used as the tracer gas for leak testing hermetic components?](https://mpfpi.com/faq/why-is-helium-used-as-the-tracer-gas-for-leak-testing-hermetic-components/)

Helium is used because it is an inert, non-toxic gas with a small atomic size, allowing it to pass rapidly through microscopic pathways. Its low natural presence in air (5 ppm) allows mass spectrometer leak detectors to isolate and measure minuscule leak rates without background interference.

[Read More](https://mpfpi.com/faq/why-is-helium-used-as-the-tracer-gas-for-leak-testing-hermetic-components/)