A centrifugal tube (centrifugal tube or centrifuge tube) is a tubular specimen container used primarily in centrifuges to separate various substances such as blood, cells, proteins, etc. The centrifugal tube is usually made of glass or plastic and can be sealed or capped. Centrifuge tubes are usually made of glass or plastic and can be supplied with either a sealed cap or a gland. Depending on the needs, centrifuge tubes are available in different sizes and shapes, such as conical, flat-bottomed, round-bottomed, and so on. Centrifuge tubes are widely used in laboratories and are one of the important accessories for laboratory centrifuges.