Cangzhou Shengfeng Plastic Products Co., Ltd.
-
Products CenterEnterprises that have been engaged in the manufacturing of engineering machinery filter cartridges, mechanical filter cartridges, and special-shaped filter cartridges for a long time have a deep foundation and rich experience in the manufacturing and processing of filter cartridges. We specialize in manufacturing various types of engineering machinery filters, including hydraulic press filters, air filters, natural gas filters, dust removal filters, and more. Support personalized customization and processing of finished and semi-finished products. Our company will fully leverage its own advantages and adhere to the purpose and concept of "sincere cooperation, co creation of brilliance, pursuit of excellence, and creation of the future". With strong product process research and development capabilities, efficient flexible manufacturing capabilities, and good customer collaboration capabilities, we will continuously innovate in technology, equipment, services, and management methods to continue manufacturing more filters that meet market demand
Cangzhou Shengfeng Plastic Products Co., Ltd.
31
2023
-
05
Precautions when heating test tubes
Author:
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.
Next Page
Next Page