Metal Tube Metal tube refers to a pure metal tube made of high-purity metal. According to different classifications, there are mainly precious metal tubes, rare metal tubes, refractory metal tubes and conventional metal tubes.
Capillary Tube Capillary tube usually refers to a thin tube with an inner diameter equal to or less than 1 mm. It is called capillary tube because some tubes are as thin as hair. Generally, we call tubes with very thin inner diameters "capillaries". It is mainly used in medicine and building materials.
