Tungsten oxide is a kind of tungstic anhydride, which is a tungstate product. Tungsten oxide includes tungsten trioxide and tungsten dioxide. There is no tungsten dioxide product in actual industrial production. According to the content of tungsten trioxide, tungsten trioxide is divided into tungstic acid, sodium tungstate, calcium tungstate, ammonium paratungstate, ammonium metatungstate and other products.
Exposure to tungsten compounds can irritate the upper respiratory tract and deep respiratory tract, cause bronchial asthma and gastrointestinal dysfunction due to the action of dust. It is irritating to the skin, causing small nodules and scales to appear on the skin. In the United States, the maximum allowable concentration of tungsten and soluble tungsten compounds (calculated as tungsten) is 1 mg/m, and that of insoluble tungsten compounds (calculated as tungsten) is 5 mg/m. Operators should take protective measures such as wearing gas masks, gloves, glasses, and dustproof clothing. Prevent dust leakage during use. Workers are required to undergo pre-employment medical examinations as well as regular inspections.
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