In industry, rosin is a flux used in soldering. In pharmaceuticals, rosin forms an ingredient in several plasters and ointments. A related glycerol ester (E445) can be used as an emulsifier in soft drinks. Rosin can be used as a glazing agent in medicines and chewing gum. Rosin is an ingredient in printing inks, photocopying and laser printing paper, varnishes, adhesives (glues), soap, paper sizing, soda, soldering fluxes, and sealing wax. Uses Structure of abietic acid, a component of rosin Prolonged exposure to rosin, by handling rosin-coated products, such as laser printer or photocopying paper, can give rise to a form of industrial contact dermatitis. A cake of bass rosin left in a single position for several months will show evidence of flow, especially in warmer weather. For instance, double bass rosin is generally soft enough to be pliable with slow movements. Generally this means that the larger the instrument is, the softer the rosin should be. The type of rosin used with bowed string instruments is determined by the diameter of the strings. Prolonged exposure to rosin fumes released during soldering can cause occupational asthma (formerly called colophony disease in this context) in sensitive individuals, although it is not known which component of the fumes causes the problem. Rosin is also sometimes used as internal reinforcement for very thin skinned metal objects - things like silver, copper or tin plate candlesticks, or sculptures, where it is simply melted, poured into a hollow thin-skinned object, and left to harden. Any remaining rosin film can easily be rinsed away with alcohol or other solvents. Afterwards, the object can be reheated in an oven, and the rosin poured out for reuse.
ROSIN FLUX VS SKIN
Its relatively low melting point, and firm solid form allows liquid rosin to be poured into the vessel, and when cooled allows embossing or engraving of the vessel without deforming the vessel - even if it has a skin which is quite thin. It is also used for preparing shoemakers' wax, for pitching lager beer casks, and numerous other purposes such as providing backing surfaces to tin ware, copper ware, or even silver and gold vessels when embossing or engraving them. In addition to its extensive use in soap making, rosin is largely employed in making varnishes (including fine violin varnishes), sealing wax and various adhesives. Rosin consists mainly of abietic acid, and combines with caustic alkalis to form salts ( rosinates or pinates) that are known as rosin soaps. It is soluble in alcohol, ether, benzene and chloroform. It is very flammable, burning with a smoky flame, so care should be taken when melting it. The practical melting point varies with different specimens, some being semi-fluid at the temperature of boiling water, others melting at 100 ☌ to 120 ☌. It is typically a glassy solid, though some rosins will form crystals, especially when brought into solution. Rosin is brittle and friable, with a faint piny odor. The term colophony comes from colophonia resina, Latin for "resin from Colophon" ( Ancient Greek: Κολοφωνία ῥητίνη, romanized: Kolophōnía rhētínē), an ancient Ionic city. It chiefly consists of various resin acids, especially abietic acid. At room temperature rosin is brittle, but it melts at stove-top temperature. It is semi-transparent and varies in color from yellow to black. Rosin ( / ˈ r ɒ z ɪ n/), also called colophony or Greek pitch (Latin: pix graeca), is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. ( April 2023)Ī cake of rosin, made for use by violinists, used here for soldering
Please consider expanding the lead to provide an accessible overview of all important aspects of the article. This article's lead section may be too short to adequately summarize the key points.
0 kommentar(er)
