Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!

Rubberized Circuits for Guided Missiles
February 1957 Radio & Television News Article

February 1957 Radio & TV News
February 1957 Radio & Television News Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio & Television News, published 1919-1959. All copyrights hereby acknowledged.

You can go to just about any store these days and buy a tube of RTV (room temperature vulcanizing) rubber caulk. That was not the case as recently as the 1960s and 1970s. Here is a short news item about how Dow Corning Corporation's breakthrough new compound was set to revolutionize hermetic sealing of critical electronic assemblies. It shows entire subassemblies of connectors, wires, and discrete components (no ICs at the time) completely encapsulated in the stuff. I remember at Westinghouse Electric, where I worked as a technician after a tour in the USAF, we used RTV for sealing bulkhead-mounted connectors on torpedo heads and towed sonar arrays. We also used massive quantities of it to seal off machined metal molds for ceramic transducer element arrays prior to potting them with a polyurethane compound. That was cool work. The heavy aluminum molds, about 6-feet long, were placed in a huge, thick-walled aluminum tube and a vacuum was pulled while the compound was curing in order to eliminate trapped bubbles. After about 6 hours of non-stop, tedious labor, it was as close as a male can come to experiencing the miracle of birth when removing the arrays from the molds and seeing the perfect newborn sonar array with an equivalent Apgar score of 10.

Rubberized Circuits for Guided Missiles

U. S. Air Force Snark, a guided missile, roars from its launching cradle - RF Cafe

U.S. Air Force Snark, a guided missile, roars from its launching cradle with its rocket boosters flaming. The Snark couples intercontinental range with the ability to carry a first-priority warhead.

The silicone rubber material is applied with an air-pressure gun - RF Cafe

The silicone rubber material is applied with an air-pressure gun to many electrical components of the Snark missile. Here is a filter assembly during and after potting.

New silicone rubber that cures at room temperature provides a protective coating for vital circuits.

Using a new silicone rubber that cures at room temperature, engineers at Northrop Aircraft, Inc., have developed a quick, easy, and almost foolproof guarantee of top performance for vital high impedance circuits in the Snark guided missile, the F-89 interceptor, and other projects.

After electronic panels in the circuits are packed with resistors, capacitors, transistors, and other gear designed to record or transmit information during flight, the panels are coated with Silastic RTV, the room temperature curing silicone rubber developed by Dow Corning Corp. According to Northrop designers a single coating of the silicone rubber cushions vibration, provides moisture resistance, improves surface resistivity of the panels, and protects the assemblies from rough handling. Individual components may be inspected after assembly by simply slitting open the silicone rubber to expose the unit. Slit is then patched with the same rubber.

Among the electronic components which Northrop Aircraft protects with the new silicone rubber - RF Cafe 

Among the electronic components which Northrop Aircraft protects with the new silicone rubber are these junction boxes, shown here before and after the potting.



Posted March 5, 2021
(updated from original post on 7/19/2013)

Windfreak Technologies SynthHD PRO - RF Cafe
Windfreak Technologies Frequency Synthesizers - RF Cafe
TotalTemp Technologies (Thermal Platforms) - RF Cafe
Copper Mountain Technologies (VNA) - RF Cafe
withwave microwave devices - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: