GST centrifuge tube automatic production line This time, let’s talk about why centrifuge tubes are also called ep tubes? In 1963, the world’s first eppendorf microcentrifuge tube was born in Germany’s eppendorf company, providing a new method for micro-manipulation experiments in molecular biology. tool. Today eppendorf (ep tube) has become a special name for the indispensable small tube in the laboratory.

　　1. Size classification

　　According to its size, it is divided into 0.6ml, 1.5ml, 2.0ml, 5.0ml, 7.0ml, 10ml, 15ml, 50ml, etc. If your centrifuge is equipped with 30ml or other specifications of centrifuge tubes, you must consider imported ones up. In addition, centrifuge tubes are also divided into round bottom and pointed bottom, as well as screw cap and plug cap. Centrifuge tubes with screw caps have finer scales, and those with plugged caps have only one overall capacity mark.

　　2. Material classification

　　Commonly used centrifuge tubes in laboratories include plastic and glass. Generally, plastic is used more, because glass centrifuge tubes cannot be used in high-speed or ultracentrifuges. Plastic centrifuge tubes are made of PP (polypropylene), PC (polycarbonate), PE (polyethylene) and other materials. PP pipe performance is relatively better. The plastic centrifuge tube is transparent or translucent, and the centrifugation of the sample can be seen intuitively, but it is relatively easy to deform and has poor corrosion resistance to organic solvents, so the service life is short. Therefore, laboratories generally purchase centrifuge tubes frequently. The following is a brief introduction to each material.

　　PP (polypropylene): translucent, with good chemical and temperature stability, but it will become brittle at low temperature, so it should not be centrifuged below 4°C.

　　PC (polycarbonate): It has good transparency and high hardness, and can be sterilized at high temperature, but it is not resistant to strong acids and alkalis and some organic solvents such as alcohol. It is mainly used for ultra-high speed centrifugation above 50,000 rpm.

　　PE (polyethylene): opaque. It does not react with acetone, acetic acid, hydrochloric acid, etc. It is relatively stable and tends to soften at high temperatures.

　　PA (polyamide): This material is a polymer made of PP and PE. It is translucent and has very stable chemical properties, but it is not resistant to high temperatures.

　　PS (polystyrene): transparent, high hardness, stable to most aqueous solutions, but will be corroded by various organic substances, mostly used for low-speed centrifugation, and generally used for one-time use.

　　PF (polyfluorine): translucent and can be used at low temperature. If the experimental environment is -100°C-140°C, centrifuge tubes made of this material can be used.

　　CAB (Cellulose Butyl Acetate): transparent, can be used for the gradient determination of dilute acid, alkali, salt, alcohol and sucrose.