Powder and Bulk Engineering
Friday, August 22, 2014
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Publication Date: 03/1992
Pages: 3
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Inerting control system prevents explosions in photoresist processing line

An inerting control system provides safe processing after an internal safety review reveals a manufacturer's need for explosion protection prior to line startup.

Du Pont's imaging systems plant in Towanda, Pa., manufactures a variety of products, including photoresists used in the manufacture of printed circuit boards. One of the plant's photoresist processing lines uses many ingredients and a proprietary process. One ingredient is a powder ranging in size from 200 to 400 microns. The powder's explosibility parameters include a minimum ignition energy [MIE] of about 400 to 500 millijoules and a minimum oxygen concentration [MOC] for combustion of about 8.5 percent.

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