Accession Number:

AD0412282

Title:

VACUUM DE-GASSING OF ENCAPSULANTS,

Descriptive Note:

Corporate Author:

LOCKHEED MISSILES AND SPACE CO SUNNYVALE CALIF

Personal Author(s):

• DeFelice,A.

Report Date:

1961-06-01

Pagination or Media Count:

17.0

Abstract:

Processes and techniques for the operation of the Vacuum Impregnator for de-gassing the resins used for encapsulating electronic modules is reported. A total of 225 distinct tests were run using 9 different resin formulations. Resin types in cluded epoxies and polyurethanes. Two factors, pre-mix temperature of ingredients and appli cation of vacuum were varied. The resulting samples were evaluated for bubbles, cracks, crazing and hardness. Application of vacuum to batches prior to casting and curing proved effective for de-gassing encapsulating materials for most of the formulations tested. Taken over all the results varied widely, ranging from perfect to unacceptable. Author

Descriptors:

• *ENCAPSULATION
• *MODULES(ELECTRONICS)
• MANUFACTURING
• DEGASIFICATION
• VACUUM APPARATUS
• EPOXY RESINS
• POLYETHYLENE PLASTICS
• TEMPERATURE
• BUBBLES
• CRAZING
• HARDNESS
• CASTING

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE