Dave wrote: >Are you, or anyone else, aware of any reasons silica gel should not be used >in electronic enclosures? Silica gel is one of a number of available dessicants, each with its own uses. It is a form of silicon dioxide (quartz), one of the least reactive substances known. Silica gel is often used in electronic equipment to combat humidity. Another class of dessicants comprises molecular sieves such as zeolites, which are used in some vacuum pumps. These are generally non-reactive, and some may be suitable for use in electronic equipment. Calcium sulfate and calcium chloride are sometimes used as dessicants in electronic equipment, but are more reactive and may be more likely to cause problems than silica gel or zeolites. Best regards, Charles