Glob tops are achieved by either dispensing one material in a hemispherical shape or by dispensing two materials in a dam and fill configuration. One material is dispensed first to form the walls of a dam and another material fills the dam. The material used for dispensing walls is normally a higher viscosity material than the one used for filling the dam. The higher viscosity material traps the low viscosity material in the walls and allows the low viscosity deposition to attain the required thickness. They are commonly used for sealing LEDs.
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