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Expandable Gas Chamber

IP.com Disclosure Number: IPCOM000088215D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Boyce, RH: AUTHOR [+4]

Abstract

A calibrated expandable gas chamber (not shown) is used for gas chromatograph analysis. In one particular application, it is used in the analysis of chemical solvents contained in printed-circuit boards which cause blisters and the like in the board when being manufactured.

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Expandable Gas Chamber

A calibrated expandable gas chamber (not shown) is used for gas chromatograph analysis. In one particular application, it is used in the analysis of chemical solvents contained in printed-circuit boards which cause blisters and the like in the board when being manufactured.

A known size, e.g., 3/8'', circular die punches out a number, e.g., five, of specimens from the board to be analyzed. The specimens are weighed and placed in a graduated syringe, which acts as the expandable chamber. The syringe is then heated under a controlled time/temperature cycle sufficient to change the solvents into gases. At the end of the cycle, the amount of gas expansion is noted by the resultant syringe piston displacement it causes, and the gas is thereafter injected into the chromatograph gas chamber for a qualitative analysis and/or ratio analysis of the solvents. The noted gas expansion in the syringe is correlated with the known expansion rate and the quantity of the helium present in the syringe to determine the amount of solvents present in the specimens.

In another application, the calibrated gas chamber is used in conjunction with a moisture evolution analyzer to determine the moisture content in the printed- circuit board laminate and epoxy fiberglass layer.

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