Advantages: Low processing difficulty and high processing efficiency; Disadvantage: Using a bottom mold stamping to stretch and shape the platinum sheet, due to local stress, the wall thickness of the stress area will be thinner than other parts, and the overall thickness of the crucible will be uneven, ultimately affecting the service life of the platinum crucible.

Alumina crucible has good thermal conductivity, high mechanical strength, high temperature resistance, corrosion resistance, erosion resistance, chemical stability and thermal shock resistance.

A pipette, also known as a pipette gun, is a commonly used tool for quantitatively transferring liquids. It is widely used in fields such as biology and chemistry, as well as clinical diagnostic laboratories, biotechnology laboratories, pharmaceutical and chemical laboratories, environmental laboratories, and food laboratories. There are two types of commonly used tools: manual adjustable pipettes and electric ones. There are also many optional specifications depending on the volume of the liquid being transferred.

Boil in dilute hydrochloric acid or dilute nitric acid, among which dilute hydrochloric acid is more convenient to prepare (1-1.2) mol/L hydrochloric acid solution). Note that the dilute hydrochloric acid used must not contain oxidizing agents such as nitric acid, nitrate, halogen, etc.

1. If not used for a long time, adjust the range of the pipette gun to the maximum scale, so that the spring is in a relaxed state to protect the spring. Failure to pay attention to this point can easily cause the piston to not rebound.

Chemical reagents do not have a strict shelf life like food and drugs. Chemical reagents generally do not have specific requirements and boundaries for shelf life. According to national regulations, chemical reagents do not need to be labeled with a shelf life, and there is no shelf life to say. As long as their properties do not change, they can generally be used. Some reagents can be determined by whether they have clumped, weathered, deliquescent, or moldy to determine if they have expired.