Meaning
Gas-tight barriers prevent the entry of moisture and other atmospheric contaminants into electronic or vacuum-insulated enclosures, maintaining an internal pressure differential over a multi-year lifespan. Applying a hermetic vacuum seal protects sensitive sensor arrays and optoelectronic devices from rapid degradation. This technology maintains a controlled atmosphere or vacuum to ensure the long-term functionality of critical components.
Commercial distribution contracts for high-reliability components specify these seals to prevent premature field failures in challenging industrial environments.
Leakage Rate
Helium mass spectrometry is employed during quality audits to measure the microscopic outflow of gas from the sealed package. When a factory manufactures a hermetic vacuum seal, the contract specifies a maximum allowable leak rate, often set below one billionth of a cubic centimeter per second. This rigorous benchmark ensures that the internal vacuum will persist for decades.
Lots that exceed this leak rate are rejected immediately.
Service Obligation
Long-term product warranties in the aerospace and marine sectors require robust protective packaging to minimize expensive field repairs. Utilizing a hermetic vacuum seal decreases the distributor’s liability for hardware failures under humid or saline conditions. This robust protection lowers the warranty reserve funds that manufacturers must set aside.
It also reduces the need for on-site technical support.
Manufacturing Cost
Specialized glass-to-metal or ceramic-to-metal brazing techniques require capital-intensive vacuum furnaces to execute. The production of a hermetic vacuum seal adds a significant premium to the landed cost of the electronic assembly. This high unit cost is justified by the elimination of moisture-induced corrosion.
