What is rosin?
Rosin is a rather fragile vitreous substance of amorphous type. It has a wide range of color (from light yellow to almost brown). Rosin is one of the components of the resins of coniferous trees, and from the point of view of chemistry it is a very complex mixture consisting of organic acids, as well as their isomers.
Production and varieties of rosin
Experts divide rosin into three main varieties:
Pine rosin is made directly from gum resin, which is isolated, as you might guess from the very name, pine. Collect it exclusively by hand, cutting in a certain way and in certain places the bark of trees. This method is very laborious, but the resin, which is collected using it, is the most qualitative. To get rosin, volatile substances (turpentine) are evaporated from it. Extraction rosin is significantly cheaper, and it is produced industrially by dissolving chopped wood chips in organic solvents (for example, gasoline).Compared to pine rosin, its acid number is lower, and the melting point is also different. Raw material for obtaining tall pulp rosin is tall oil - one of the wastes of the pulp industry. Its distinctive feature is a very unpleasant smell, besides, by its characteristics it is seriously inferior to both pine and extraction.
Before you buy rosin, you need to pay attention to its quality characteristics. If it will be used for soldering, the most preferred gum, pine. It should be borne in mind that the best has class A. It is the most pure, and with a decrease in the “classiness” rosin includes an increasing amount of impurities that negatively affect the soldering process. The lowest quality rosin has a dark color and, if possible, it is better not to use it at all. By the way, by the same principle it is worth choosing for other applications, which it has a lot.
In addition to being used as a flux when brazing, rosin is used in the pulp and paper industry in order to glue some grades of cardboard to increase its strength.In addition, it has found wide application in the manufacture of plastics, rubber, detergents, linoleum. With the addition of rosin make excellent varnishes and paints having a high degree of fluidity. A variety of applications of rosin is based on its anti-friction (i.e. anti-slip) properties. For example, it is her sometimes rubbing transmission belts to avoid their "slipping" on the pulleys. People of art can not do without rosin: to prevent slipping with special powder, which it includes, it is used to process the shoes of dancers. In addition, the bows of stringed instruments (cellos, violins, etc.) are periodically rubbed with rosin.
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