Melting point refers to the temperature at which a substance is in equilibrium with solid and liquid at atmospheric pressure. The melting point of a solid substance is usually measured by heating the crystal material to a certain temperature , and the crystal begins to change from a solid state to a liquid state, and the temperature at this time is the melting point of the crystal material.
Melting point measurement is the basic means of identifying the nature of a substance and is one of the important methods for determining purity. Therefore, the melting point instrument plays an important role in the chemical industry and medical research. It is an indispensable instrument for the production of drugs, perfumes, dyes and other organic crystalline substances , and is also one of the basic instruments commonly used in laboratories.
Pure solid organic matter generally has a fixed melting point, and the melting point range ( also known as the melting range or the melting distance, which means the temperature interval from the initial melting to the full melting ) is small, generally not exceeding 0.5-1 ° C ; if the substance is not In pure time, the melting point will decrease [ can be explained by Raoult 's law ] and the melting point range will expand. This property is used to judge the purity of a substance and to identify an unknown compound. For example, if an unknown compound is measured to have the same or very similar melting point as a known compound, the unknown sample is mixed with the known sample in equal amounts and the mixed melting point is determined. If the melting point does not change and the melting point range does not exceed 1 °C , it is generally considered that the two are the same substance. If the melting point of the mixture changes and the melting point range is large, it can be judged that they are not the same substance. This method of identification is called the mixed melting point method.
There are two methods for measuring the melting point: one is the capillary melting point measurement method, and the other is the melting point method for determining the melting point method. Based on the development and progress of science and technology, the melting point meter is continuously updated and realized, and many practical functions are realized, and the operation is convenient and the data is accurate. Therefore, the method commonly used in the laboratory is to determine the melting point by using a melting point apparatus. At present, the most widely used melting point instrument in the world is the MPA100 automatic melting point instrument which is the latest research result of the Stanford University Research Institute . The MPA100 melting point meter is designed according to the melting point detection method prescribed by the Pharmacopoeia. The MPA100 melting point meter uses electronic technology to realize temperature program control, initial melting and final melting digital display. A linearly corrected platinum resistor was used as the sensing element, and a fast "starting temperature" setting was achieved with an electronic circuit, three channels simultaneously set and an optional linear heating rate. The MPA100 melting point instrument uses the capillary tube specified by the Pharmacopoeia as a sample tube. The high-resolution digital imaging detector is used to observe the melting process of the sample in the capillary tube. It is clear and intuitive, and is an ideal melting point detection instrument for the pharmaceutical, chemical, fuel, fragrance, rubber and other industries.
For more information, please click MPA100 melting point meter  Http://?id=395
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