Select Country. Know How. Download the melting point and dropping point guide. Melting point and dropping point guide — Free download. The Melting Point. Melting point is easy to determine and, since it is a numerical property, can be conveniently tabulated and classified.
Since melting point is highly dependent on purity, it can also be used for evaluating the quality of substances. Pure crystalline substances change to the liquid state at a precisely defined temperature, which is specific for each crystalline material. Crystalline and molten states of the same material can only exist at the same time at the melting point. Automatic melting point determination methods make use of these phenomena, which become visible during the change in aggregate state. Pure substances melt at a highly-defined temperature whereas impure, contaminated substances generally exhibit a large melting interval.
The temperature at which all material of a contaminated substance is molten is usually lower than that of a pure substance. This behavior is known as melting point depression and can be used to obtain qualitative information about the purity of a substance. In the previous chapter we learned that we cannot measure the sample temperature directly using a certified thermometer.
Therefore, in order to check the temperature accuracy, we use reference substances ideally with certified temperature values. Thus, we can compare nominal values including tolerances with actual measured values. If calibration fails, which means if the measured temperature values do not match the range of the certified nominal values of the respective reference substances, we need to adjust the instrument.
They include ointments, synthetic and natural resins, edible fats, greases, waxes, fatty acid esters, polymers, asphalt and tars. These materials gradually soften as the temperature rises and melt over a relatively large temperature interval. Corps Gras Harangozo, D. Kunzmann, T. Keim, E. Download references. You can also search for this author in PubMed Google Scholar.
Fat melting point determinations: a review. J Am Oil Chem Soc 50, — Download citation. Received : 01 November Issue Date : April Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article. Provided by the Springer Nature SharedIt content-sharing initiative. This field is for validation purposes and should be left unchanged.
Request More Information. Please let us know what information you are requesting? I need a quote I need documentation for a product I need technical or application support Other - please specify. If you plan to purchase a product, please indicate the expected time frame.
What type of documentation are you requesting? Request A Quotation. Educational and Training Services. Request Information. Service Support - Request Info.
Select your product brand Waters Mettler Toledo Other - please specify. Service Support - Request Service. Please fill out the information on the form below.
Select the type of support you require My equipment is out of operation My equipment is not functioning properly but still operating My equipment needs a service visit to be scheduled Other - please specify. Require immediate repairs or service to instrument Performance maintenance of instrument Qualification service Relocation Software support.
My equipment is out of operation My euipment is not functioning properly but still operating My equipment needs a service visit to be scheduled Calibration services Other - please specify. On this page you will gain essential knowledge about the melting point technique.
Furthermore, practical tips and hints for daily work are provided. Gain essential knowledge for dropping and softening point determination. Learn practical tips to improve your daily laboratory routine.
Automated Reactors and In Situ Analysis. Transport and Logistics. Expertise Library. Literature: White Papers, Guides, Brochures. Technical Documentation. On Demand Webinars.
Live Events. Live Webinars. Management Investor Relations. Service Finder Videos. Select Country. Melting and Dropping Point Applications. Application Search. Clear Search. Need Help? Titration [ ] No Results. Melting Dropping Point [ ] No Results. Density Refractometry [ ] No Results. Moisture [ ] No Results. What is Melting Point? What is Dropping Point? What is Softening Point? See details. Request Info Get a Quote. See less. Overview Related Products.
Library Literature. In this application note the conventional and the direct sampling techniques for the slip melting point of lip balm samples are compared.
0コメント