NDLI: "Water Vapor Penetration Rate Into Enclosures with Known Air Leak Rates"

Content Provider	IEEE Xplore Digital Library
Author	DerMarderosian, Aaron Gionet, Vincent
Copyright Year	1978
Description	Author affiliation: Raytheon Company, Equipment Division, Sudbury, Mass. (617) 443-9521 (DerMarderosian, Aaron; Gionet, Vincent)
Abstract	The rate at which water vapor penetrates a faulty seal in a "hermetically sealed" device has been examined both experimentally and theoretically in this study. The experimental data was generated by studying the rate of moisture ingress into two types of packages; a TO-5 can and a 1/4 × 1/4 inch ceramic flatpak. The TO-5 packages were fitted with capillary tubes of varying diameters with known air leak rates and represented the gross leak range (down to 10O atm cc/sec) while the 1/4 × 1/4 inch ceramic flatpacks were used to study the fine leak range (10¿6 to 10¿8). Both type packages were fitted with miniature moisture sensors (surface conductivity type) and calibrated at known relative humidities prior to sealing. The finished test packages were then exposed to constant high humidity conditions and monitored for moisture content as a function of time. A theoretical analysis was performed by using conventional leak rate equations to convert air leak rates, at standard test conditions, to water vapor leak rates at partial pressure differentials seen typically at room ambient conditions. This data compared favorably with the experimental results in the range tested and suggests that present hermeticity specifications are too lenient for long term reliability requirements.
Starting Page	179
Ending Page	186
File Size	8526647
Page Count	8
File Format	PDF
ISSN	07350791
DOI	10.1109/IRPS.1978.362843
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1978-04-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Packaging Moisture Testing Ceramics Humidity Hermetic seals Conductivity Condition monitoring Performance analysis Performance evaluation
Content Type	Text
Resource Type	Article

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