---
title: "Engineering Basics"
canonicalUrl: "https://mpfpi.com/faq-category/engineering-basics/"
dateModified: "2026-07-28T16:06:34+00:00"
---

Engineering Basics Archives - MPF Products, Inc.
# Engineering Basics

###  [What defines a true hermetic seal in vacuum applications?](https://mpfpi.com/faq/what-defines-a-true-hermetic-seal-in-vacuum-applications/)

A true hermetic seal is an entirely airtight joint that prevents the permeation of gas, moisture, and contaminants into or out of a sealed volume. In vacuum systems, this is typically achieved through molecularly bonded ceramic-to-metal or glass-to-metal seals, maintaining ultra-high vacuum integrity down to 10⁻¹¹ Torr.

[Read More](https://mpfpi.com/faq/what-defines-a-true-hermetic-seal-in-vacuum-applications/)