How to select material for centrifugal tube in laboratory


Centrifugal tube is a common experimental consumable in […]

Centrifugal tube is a common experimental consumable in laboratory, which is mainly used for cooperating with centrifugal dehydrator. The liquid to be tested is packed in the filter, and then put into the centrifugal dehydrator for filtration.
According to the different materials, the whole can be divided into plastic and laminated glass, plastic centrifugal tube can be used more, and can be divided into PP, PC, PS, etc., according to the different must, the manufacturer will select different plastic raw materials to carry out the production.
According to its size, it can be divided into 1.5ml, 1ml, 5ml, 10ml, 15ml, 50ml and so on. The domestic centrifugal tubes are generally of these many specifications and models, and most of them are 10ml and 50ml. If your centrifugal dehydrator is equipped with 30ml or other specifications and models of centrifugal tube, you need to consider the import. In addition, the centrifugal tube also has a round bottom and a sharp bottom, as well as a spiral cover and a plug cover. The centrifugal tube with screw cap has a fine scale, and the inserted cap only has an integral volume mark.
The common centrifuge tubes in the laboratory are plastic and laminated glass. Generally, plastic is used more, because laminated glass centrifuge tubes cannot be used in high-speed or super speed centrifuges. Plastic centrifugal pipe and PP (polypropylene), PC (polycarbonate), PE (high pressure polyethylene) and other materials. The pipeline characteristics of PP are relatively good. The plastic centrifuge tube is completely transparent or transparent color, which can visualize the filtration condition of the test sample, but it is very easy to deform and has weak resistance to solvent corrosion, so its service life is short. Therefore, the laboratory will often choose centrifugal tube. The following is a brief introduction to various materials.

PP (polypropylene): transparent color, organic chemistry and temperature reliability is good, but it will become brittle at ultra-low temperature, so do not filter below 4 ℃.
PC (polycarbonate): good clarity, high strength, high temperature disinfection, but not resistant to strong oxidants and some solvents such as ethanol. The key is to use fast filtration above 50000 rpm.
PE (high pressure polyethylene): not completely transparent. And toluene, glacial acetic acid, sulfuric acid do not reflect, relatively stable, very easy to loosen at high temperature.
PA (acrylic resin): this kind of material is PP and PE material polymer, transparent color, physical properties are very stable, single heat resistant.
PS (polyethylene): fully transparent, high strength, stable for most of the solution, but it will be eroded by a variety of organic compounds. It is mostly used for low-speed filtration, and is generally disposable.
PF: transparent color. It can be used in ultra-low temperature. If it is in the natural environment of - 100 ℃ - 140 ℃, it can be used as the centrifugal tube of this kind of material.
Cab (butyl acetate methylcellulose): transparent, can be used to measure the gradient direction of dilute acid, alkali, salt, ethanol and soft sugar.