Classification and material selection of centrifuge tubes

The centrifuge tube is a common experimental consumable in the laboratory, mainly used in conjunction with centrifuges. The experimental liquid is placed in it and then centrifuged in a centrifuge.

According to the different materials, it can be divided into plastic and glass. Plastic centrifuge tubes are used more, and can be divided into PP, PC, PS, etc. According to different needs, manufacturers will choose different plastic materials for production.

According to its size, it is divided into 1.5ml, 2ml, 5ml, 10ml, 15ml, 50ml, etc. Domestic centrifuge tubes are generally these specifications, and more are used 10ml and 50ml. If your centrifuge is equipped with a 30ml or other size centrifuge tube, you should consider importing it. In addition, the centrifuge tube has a round bottom and a pointed bottom, as well as a screw cap and a cover. The screw cap of the screw cap has a finer scale, and the cap has only one overall volume indication.

The centrifuge tubes commonly used in laboratories are plastic and glass. Generally, plastics are used more because the glass tubes cannot be used in high speed or ultracentrifuges. Plastic centrifuge tubes are available in PP (polypropylene), PC (polycarbonate), and PE (polyethylene). The performance of the pipe of PP is relatively good. The plastic centrifuge tube is transparent or translucent, so that the sample can be visually observed, but it is easy to deform, and the corrosion resistance against organic solvents is poor, so the service life is short. Therefore, the laboratory usually buys centrifuge tubes frequently. Let's introduce each material separately.

PP (polypropylene): Translucent, good chemical and temperature stability, but will become brittle at low temperatures, so do not be below 4 °C during centrifugation.

PC (polycarbonate): good transparency, high hardness, high temperature sterilization, but not strong acid and alkali, and some organic solvents such as alcohol. It is mainly used for ultra-high speed centrifugation of more than 50,000 rpm.

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

PA (polyamide): This material is a polymer made of PP and PE. It is translucent and chemically stable. It is not resistant to high temperatures.

PS (polystyrene): transparent, hard, stable to most aqueous solutions, but it is corroded by a variety of organic substances, mostly used for low-speed centrifugation, and is generally used at one time.

PF (polyfluorinated): Translucent, can be used at low temperatures. If it is an experimental environment at -100 ° C - 140 ° C, a centrifuge tube of this material can be used.

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

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