Glass rod
A glass rod is a common laboratory device that is used to stir mostly organic or slightly reactive mixtures. It is used universally in natural science laboratories in secondary schools , high schools , universities or institutes . The glass rod is characterized above all by its dirt-repellent ability, its inertness to react with other substances and its low price. It can be of different lengths and widths - the main feature is the complete composition of glass.
Glass rods are available in different lengths and thicknesses. On the one hand, glass rods are purchased by the meter and cut to the desired lengths with a glass cutter . The sharp-edged breaks that occur when cutting are sometimes the cause of cuts on the hands. Therefore, the edges are rounded by melting. To do this, the end of the glass rod is held diagonally against the flame and heated by turning it until the break points just start to soften.
On the other hand, there are special prefabricated parts that have, for example, a melted-down cavity that is supposed to protect against delayed boiling in the liquid ( boiling rod ).
A specially shaped laboratory glass rod is called a Peterson-Jones or just Peterson hook. The basic shape consists of a thin, hook-shaped bent tip at one end and a so-called elephant foot that is pressed flat.
Peterson Jones hooks come in various lengths and sizes. They are preferably used as scratching and scraping tools in chemical laboratories.
Individual evidence
- ^ Walter Wittenberger: Chemische Laboratoriumstechnik , Springer-Verlag, Vienna, New York, 7th edition, 1973, pp. 26–28, ISBN 3-211-81116-8 .