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Question A customer, who will be processing ESD-sensitive electronics through our automated stencil printers, has asked that we install antistatic windows in the machine's hood to prevent the build-up of static on the printer's windows which could then discharge to the customer's product. The windows are set in a non-conductive plastic hood. Am I correct in assuming that an antistatic window must be connected to ground (machine frame) to prevent the build-up of static? What is the best range of resistance (ohms/square) for such an application? - Anonymous, Franklin, MA
Answer The first concern is that the Hood is made from non-conductive plastic. The Hood could become charged and hold this charge thereby inducing charge onto nearby conductors (circuit traces). Your best bet is to coat the inside of the Hood with a conductive and anti-static film. Then, the windows should be both anti-static and conductive if possible so they may be connected to ground (machine frame) to prevent the build-up of static. The best range of resistance (ohms/square) for such an application would be from 1x10^5 Ohms/square to 1x10^10 Ohms/square.
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