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O-ring kits contain o-rings, which are rubber or metal doughnut shaped circles used most often as sealants or gaskets in industrial machinery or systems. While a machine or piping system is being assembled, the o-ring is placed between pieces that are being joined together rather then welded, usually so that the area can be accessible for machine upkeep. Because these two pieces are not permanently and thoroughly joined, there is the risk of leaking at their junction. That is why the o-ring is inserted, it's shape morphed to tightly seal the space between the pieces and keep the liquid or gas passing through the machine or system from leaking out. O-rings are produced in mass through molding systems, and some are also altered by die cutting or curing systems, which alter the chemical make-up of the o-ring material. Plastics such as nitrile, silicone, viton and Teflon are popular types of o-rings, as are metal o-rings such as aluminum, silver, steel alloys and gold. Metal alloys can be used as filler in plastic o-rings, and vice versa.
O-ring kits, which are packages of many o-ring sizes, are categorized by whether they contain standard-sized O-Rings or metric-sized O-Rings, as well as what material they were manufactured from. O-Ring kits vary in their size and varieties. Many inexpensive O-Ring kits contain thirty to fifty different sizes with up to ten O-Rings in each size. Other O-Ring kits contain a much larger variety, however, of up to five hundred different sizes. Some O-Ring kits are specialized by their application, especially O-Ring Kits used for automotive repair. For example, specialized O-Ring kits are available specifically for use with imported European cars. Other markets that O-ring kits would target include the aerospace industry, oil refineries, food and beverage companies, water treatment facilities, chemical processing plants, and many more. Specific applications that require the use of an o-ring include engine turbines, liquid chiller systems, hydraulic cylinders, brake systems and heat exchangers, just to name a few. Since many of the industries that use o-rings employ more than one machine or system that requires o-rings, the kits that provide a variety of shapes and sizes are cost-effective and convenient.