Metal britannia

Bristol-type machine Bristuron Britannia metal British antilewisite... 

Precision dupHcation, durabiHty, and metallic beauty have made antimonial alloys, such as pewter and britannia metal, desirable for decorative castings. Several different tin—base and lead-base antimony alloys are used in the jewelry industry. These alloys are typically cast in mbber or siHcone molds. 

Brining, 5 788 Brinkman s theory, 22 54 Briquetting process, 74 497 Britannia metal, composition, 3 52t British Lubrication Engineering Working Group, 75 201, 202. See also Great Britain United Kingdom (UK)... 

Pewter is an alloy of 80 per cent, of lead with 20 per cent, of tin plumbers solder consists of two parts of lead to one of tin Britannia metal is made of equal parts of brass, tin, antimony, and bismuth. 

The electro-deposition of cobalt from either of the foregoing solutions on to brass, iron, steel, copper, tin, lead, Britannia metal, and German silver may be effected under conditions similar to those employed for nickel. The deposit is firm, adherent, hard, and uniform. It is readily buffed to a finished surface having a beautiful lustre, possessing a slightly bluish cast, although beautifully white. 

Approximate composition of Britannia metal and of type metal. 

Q Britannia metal is harder than pewter. This tin-antimony alloy s properties can be varied by the addition of zinc, copper, lead, or bismuth. o When heat from a fire melts the Wood s metal plug in a sprinkler head, water that was held back by the plug is freed. 

Britannia, Britannia metal 3346, 3417 A allver-whlte alloy of tin, antimony, bismuth and copper. Largely used for tableware. 

THn plates are thin sheets of Fe, coated with Sn. Tin foil consists of thin laminae of Sn, frequently alloyed with Pb. Copper and iron vessels are tinnml, after brightening, by contact with molten Sn. Pewter, bronze, bell metal, gun meUd, britannia metal, speculum metal, type metal, solder, and fusible metal contain So. 

This expansion by molten antimony upon solidification renders it a valuable constituent of many alloys. A familiar example is type metal, an alloy of lead, tin and antimony (p. 197). Babbitt s metal (p. 212),pewter (p. 211) and Britannia metal (p. 212) also contain antimony. 

It enters into the composition of type metal, antifriction metals, and britannia metal. 

The essential point in the preparation of Britannia metal is to make the tin harder, tougher, more sonorous, and more easily polished. The alloy gives castings as fine and sharp as those made with the most fluid alloys of tin and lead, copper and zinc, etc. It acquires a finer polish than alloys of tin and lead, as the latter are too soft to sustain the action of emery and other polishing materials. Bismuth increases the fusibility. 

Dr Karmarsh states that Britannia metal, when subjected to rolling, has its specific gravity diminished. He explains this by saying that the particles, under the pressure of the rolls, have a tendency to become separated. 

Tin has three crystalline modifications or allotropes, a-tin or gray tin (diamond structure), P-tin or white tin , and y-tin the latter two are metallic with close packed structures. Tin also has several isotopes. It is used in a large number of alloys including Babbit metal, bell metal, Britannia metal, bronze, gun metal, and pewter as well as several special solders. 

Britannia metal A silvery alloy consisting of 80-90% tin, 5-15% antimony, and sometimes small percentages of copper, lead, and zinc, it is used in bearings and some domestic articles. 

The principal alloys of tin are bronze (tin and copper), soft solder (tin and lead), pewter (75% tin and 25% lead), and britannia metal (tin with small amounts of antimony and copper). 

Britannia metal Antimony, copper, tin 46 Arsenic, Antimony and Bismuth antimony section... 

The metal also finds appHcations in other alloys. Cable sheaths are made of lead that contains antimony, and lead shot for ammunition is not made of pure lead but of lead alloyed with 1-8% antimony. The American Isaac Babbitt (1798-1862) invented the bearing alloy named babbitt metal. It is an alloy of copper, antimony and tin, characterized by good antifriction properties, and used as the bearing material for axles and crankshafts. Britannia metal is another tin alloy with about 2% copper and 5-10% antimony. It is a silvery white alloy of tin, similar in appearance to pewter but harder. It is used for the manufacture of tableware. 

Britannia metal An alloy of tin with between 5 per cent and 10 per cent antimony and small amounts of copper, bismuth, lead, and zinc. It is used in bearings and tableware resembling pewter. 

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