The role of centrifuge tubes in the laboratory

Centrifuge tubes are a common and essential laboratory tool that plays an important role in experiments, analysis, and biological research. The design of the centrifuge tube enables it to withstand high-speed centrifugation processes and store and separate material samples. The following will introduce the eight main functions of centrifuge tubes in the laboratory.

2023-05-31

The Development Trends of the Packaging Industry

At present, the packaging industry in China has an increasing demand and technological content, and has become one of the important industries in the national economy. It is predicted that from 2011 to 2015, the total output value of the packaging industry will reach 600 billion yuan, with an average annual growth rate of 6%. By 2015, paper packaging products can reach 36 million tons, plastic packaging products 15.5 million tons, metal packaging products 4.91 million tons, glass packaging products 5.5 million tons, and packaging machinery 1.2 million sets.

2023-05-31

The reason why the dropper cannot be removed

The pressure inside the dropper is lower than atmospheric pressure, and the dropper is subjected to a downward force from the atmosphere. The solution is simple: heat the dropper with a water bath (not directly) to increase the vapor pressure inside the dropper and remove it. The frosted interface between the dropper and the dropper bottle is bonded due to chemical reactions, usually alkaline substances. At this point, acid cleaning is attempted, and if not possible, it can only be scrapped. The inner side of the drip bottle mouth is frosted, similar to a fine mouthed bottle, with the bottle cap replaced by a dropper. Containers used to hold small amounts of liquids, mostly used in laboratories

2023-05-31

Characteristics of reagent bottles

By utilizing the super strong wrapping force and retraction of plastic, the product is tightly and fixedly bundled into a unit, making scattered small parts a whole. Even in adverse environments, the product has no looseness or separation, and there are no sharp edges or stickiness to avoid damage. Form a light, protective surface around the reagent to achieve dust, oil, moisture, and water resistance. By utilizing the retraction force of plastic stretching, the product is packaged to form a compact, non occupying unit, tightly wrapping the pallets of the product, effectively preventing mutual displacement and movement of reagents during transportation.

2023-05-31

Method for opening the cap of a wide mouth reagent bottle

The sealing of the bottle mouth and cap of the wide mouth reagent bottle is good, without the need for a bottle stopper, and it is also impermeable; Wide mouth design, easy to use, flat inner and outer walls are smooth, easy to clean, and there is no liquid residue on the inner wall of the bottle mouth. It can be cleaned in boiling nitric acid. All other concentrated, dilute, inorganic, and organic (acids, bases, esters) have no effect. Suitable for placing high concentration, high-purity, and highly corrosive drugs, chemical reagents, and standard samples. But there may be situations where the cork cannot be removed due to long-term non use. The reason is that the liquid reagent evaporates and adheres to the glass between the bottle stoppers. When encountering this situation, the following methods can be taken:

2023-05-31

Precautions when heating test tubes

A test tube is a container used to hold a small amount of drugs, and to react with a small amount of reagents at room temperature or under heating. It can be used to produce or collect a small amount of gas. Due to the fact that test tubes, like beakers, can be directly heated, they are widely used in the laboratory. Here are some precautions for using test tubes. When heating a test tube, the outer flame of an alcohol lamp should be used. As the test tube cannot be directly held by hand during heating, the test tube holder should be used as a tool. When using a test tube clamp to clamp the test tube, the test tube clamp should be placed from the bottom of the test tube to the upper part of the test tube. If the length of the test tube is divided into three parts, it is reasonable to clamp the test tube clamp within one-third of the end near the test tube mouth. But this is not a mandatory rule, there is no need to rigidly copy it during the experiment. Before heating, the test tube should be kept dry and preheated to prevent explosion. When heating, it is necessary to keep the outer wall of the test tube free of water droplets to prevent uneven heating and bursting. After heating is completed, be sure to wait for the test tube to completely cool before cleaning. Due to the instability of the experiment, the solution in the test tube should not exceed 1/2 of the capacity of the test tube, and when heated, it should not exceed 1/3 of the capacity of the test tube. When adding liquid to the test tube with a dropper, it should not extend into the mouth of the test tube.

2023-05-31