Rosin - is amorphous, brittle substance having glassy structure and color from light yellow to dark red.It is obtained by distilling off the volatile constituents from the resin of coniferous trees.Chemical properties of rosin (90% resin acids, including basic - abietic) make it insoluble in water but soluble in ether, alcohol, chloroform and benzene.When heated to 50-120 C (for different grades) rosin sticks softened.
Where did the word "rosin"?It is likely distorted name of the ancient Greek city of Colophon, which grew up around the trees, giving the substance.In ancient times (more than three thousand years ago) of turpentine resin obtained by heating, and the dry residue is precisely the primitive rosin substance.
Rosin - an accessory, without which you can not play, such as the violin, viola, double bass, cello.When rubbing a piece of the bow of the substance produced free molecules, which give a certain cohesion to the string, which helps extract audio.Such rosin often produce non-industrial way of resin collected exclusively in the fall with the addition of the "secret" ingredients that their every company (can be added to steel, silver and even gold dust, etc.).In addition, the rosin before rubbed soles to sports, such as wrestlers and jockeys before a race seat.
Rosin - a substance that was widely used and applied in the industry.In earlier times, it was claimed in soap making, production of adhesives, sealing wax.Today, compounds with rosin used for fixing the glass components to the lamp cap for the production of lacquers, when printing papers for soldering industries, as well as in the paper industry.And everywhere used its main feature - the ability to create sticky compounds when heated.
rosin production in general has not changed over the millennia.The starting material (tarred stumps collected resin - oleoresin) is placed in Cuba, where it is treated with steam or heated over a fire.From quintal turpentine receive about 12 kg of turpentine (distilled) and 70 kg of rosin, which is boiled to remove the fluid and placed into containers.If the substance is extracted from the stump, they are pre-crushed and then a mixture of chips and water is subjected to the extraction process.From one cubic meter of wood can get tarred about forty kilograms of rosin.
What basic regulations used by enterprises that produce rosin?Standard number 19113 - 84, in particular, the basic requirements for a number of products and production parameters.From this we can determine which should be in the appearance of rosin, what is permissible density, the water content, the softening point, acid number and others. The document also specifies requirements for the safety of the production process (rosin - it moderately hazardous substance asits aerosol may cause irritation), acceptance rules, methods of analysis of the finished product, the retention rules and guarantees.
