As tungsten carbide powder is a micro powder, so again remind the Tungsten Carbide Powder Production Workshop related personnel note the following matters:

1. Tungsten carbide dust can cause bronchitis, bronchiolitis, atresia of bronchiolitis and atrophic emphysema.

2. Tungsten carbide may cause proliferation of lymphoid tissue cells in the lungs and gradually harden, thickening and homogenization of the vascular wall.

3. Workers exposed to tungsten carbide dust in the work of gastrointestinal dysfunction, kidney stimulation, the upper respiratory tract appear in the inflammation of the card.