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Detecting Device Susceptibility to Fluid and Contaminant Ingress

IP.com Disclosure Number: IPCOM000074533D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Schwartz, AM: AUTHOR

Abstract

Capacitors and other electronic components may be tested by the following method: Step 1) Measure capacitance, dissipation factor, and insulation resistance of the capacitors to be tested. Step 2) Place capacitors in a container and seal securely. Step 3) Evacuate the container to one PSI (52 rm or 2.04 inches of Hg) +/- 0.5 PSI. Step 4) Place the container in an oven at 85 degrees C +/- 2 degrees C for 2 hours +/- 10 minutes. (NOTE: Include this step for components which are not thermally sensitive) Step 5) Remove the container from the oven and inject a sufficient volume of 5% aqueous NaCl solution into the container to cover all parts. The pressure inside the container shall be maintained at the value in step 3. Replace the container in the oven for an additional 2 hours +/- 10 minutes.

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Detecting Device Susceptibility to Fluid and Contaminant Ingress

Capacitors and other electronic components may be tested by the following method: Step 1) Measure capacitance, dissipation factor, and insulation resistance of the capacitors to be tested. Step 2) Place capacitors in a container and seal securely. Step 3) Evacuate the container to one PSI (52 rm or 2.04 inches of Hg) +/- 0.5 PSI. Step 4) Place the container in an oven at 85 degrees C +/- 2 degrees C for 2 hours +/- 10 minutes. (NOTE: Include this step for components which are not thermally sensitive) Step 5) Remove the container from the oven and inject a sufficient volume of 5% aqueous NaCl solution into the container to cover all parts. The pressure inside the container shall be maintained at the value in step 3. Replace the container in the oven for an additional 2 hours +/- 10 minutes. Step 6) Remove the container from the oven and within 30 seconds, pressurize the container to 12 +/- 1 PSI gage pressure. Allow the container to remain pressurized at room temperature for 2 hours +/- 10 minutes. Step 7) Reduce pressure to one atmosphere, remove the capacitors, rinse thoroughly with deionized water and dry part surfaces with absorbent tissues and/or compressed air. Step 8) Within one half hour after drying measure capacitance, dissipation factor, and insulation resistance.

Increases in capacitance and dissipation factor together with decrease in insulation resistance are indicative of moisture pene...