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The fume from silver solder was examined. It contained very high percentage of cadmium (about 85%) in usual welding procedure, though original solder about 24%. The fume collected by Cascade Impactor was analysed chemically on each stage, and it was found that the cadmium content in the particles increased with the decrease of particle size. X-ray diffraction analysis of the fume showed that cadmium in the fume is the cadmium oxide. Therefore, it is assumed that workers exposed to the fume from silver solder inhale an enough amount of very small particles whose main component is cadmium oxide, and may suffer from acute cadmium poisoning. The silver solder has become to be used widely by its low melting point and good heat conductivity. This solder is generally composed of silver, cadmium,

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