One of our scientists has asked for guidance in the use of inert (N2) atmosphere glove boxes for processes utilizing flammable liquids and electrical appliances. Details of the process of concern follow: * Dispersed (in xylenes) silicon nanoparticles are to be further dispersed using a SS ultrasonic wand (20 kHz) * Process to be performed in a N2 atmosphere glove box * Monitored O2 levels will not exceed 10ppm in the box * All power to the glove box (including the wand) is cut upon exceeding 10ppm O2 concentration in the box * The lab bldg is provided with a fire sprinkler system as well as CO2 extinguishers within 10 ft Questions: * Is there a (any) concern regarding the use of a wand-type ultrasonic to agitate a flammable solvent in an inert atmosphere? * Should this level of O2 (= 10 ppm) be a concern from a flammability perspective? * Under this scenario, at what O2 levels should fire reasonably be a concern? I appreciate any and all feedback on this topic. Regards, I Jay Saldivar Sr Safety Administrator Sharp Microelectronics of the Americas NW Pacific Rim Blvd Camas, WA 98607 360/834-8734 (o) 360/772-4502 (c) saldivarj**At_Symbol_Here**sharpsec.com
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