How to select materials for laboratory centrifuge tubes
Centrifuge tube is a common experimental consumable in the laboratory, and it is mainly used in conjunction with the centrifugal dehydrator. The liquid to be tested is packed in this, and then placed in the centrifugal dehydrator for suction filtration.
According to the different materials, the whole can be divided into plastic and laminated glass. Plastic centrifuge tubes are used more, and can be divided into PP, PC, PS, etc. According to different requirements, the manufacturer will select different plastic raw materials to carry out the production. .
According to its size, it is divided into 1.5mL, 1mL, 5mL, ten-meter L, 15mL, fifty-meter L, etc. The domestic centrifuge tubes generally have these multiple specifications and models, and the most used are ten-meter-liter and five-meter-liter. Ten meters L. If your centrifugal dehydrator is equipped with 30mL or other specifications of centrifuge tubes, you need to consider imports. In addition, the centrifuge tube also has a round bottom and a pointed bottom, as well as a screw cap and a plug-in cap. The centrifuge tube with screw cap contains a finer scale, and the cap has only an overall volume indicator.
The common centrifuge tubes in the laboratory are plastic and laminated glass. Generally, plastic is used more. Because the centrifuge tube of laminated glass cannot be used in high-speed or ultra-speed centrifuges. Plastic centrifuge tubes are made of PP (polypropylene), PC (polycarbonate), PE (high pressure polyethylene) and other materials. The pipe characteristics of PP are relatively good. The plastic centrifuge tube is all transparent or transparent, which can visually see the test sample's suction filter condition, but it is very easy to deform, and the corrosion resistance of solvents is weak, so the service life is short. Therefore, the laboratory will often purchase centrifuge tubes. Let's introduce each of the various materials below.
PP (polypropylene): transparent color, good organic chemistry and temperature reliability, but it will become brittle at ultra-low temperature, so do not filter below 4°C.
PC (polycarbonate): good clarity, high strength, can be sterilized at high temperature, but not against strong oxidants and some solvents such as ethanol. The key is to quickly filter above 50,000 revolutions.
PE (High Pressure Polyethylene): Not completely transparent. It does not react with toluene, glacial acetic acid, sulfuric acid, etc., it is relatively stable, and it is very easy to loosen under high temperature.
PA (Acrylic resin): This type of material is a high polymer of PP and PE materials, with transparent color, very stable physical properties, and no heat resistance.
PS (Polyethylene): Fully transparent, strong, stable to most solutions, but will be eroded by a variety of organic compounds. It is mostly used for low-speed suction and is generally used for one time.
PF (polyfluoride): transparent color, can be used in ultra-low temperature, if it is a test natural environment at -100℃-140℃, centrifuge tubes of this kind of material can be used.
CAB (Butyl Acetate Methyl Cellulose): Fully transparent, it can be measured in the gradient direction of dilute acids, alkalis, salts, and ethanol and soft sugar.
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