Chemistry:Pewter
Pewter (/ˈpjuːtər/) is a malleable metal alloy consisting of tin (85–99%), antimony (approximately 5–10%), copper (2%), bismuth, and sometimes silver.[1] Historically, pewter was an alloy of tin and lead, but most modern pewter does not use lead in order to avoid lead poisoning. Pewter has a low melting point, around 170–230 °C (338–446 °F), depending on the exact mixture of metals.[2][3] The word pewter is probably a variation of the word spelter, a term for zinc alloys (originally a colloquial name for zinc).[4]
History
Pewter was first used around the beginning of the Bronze Age in the Near East. The earliest known piece of pewter was found in an Egyptian tomb, c. 1450 BC,[5] but it is unlikely that this was the first use of the material. Pewter was used for decorative metal items and tableware in ancient times by the Egyptians and later the Romans, and came into extensive use in Europe from the Middle Ages[6] until the various developments in pottery and glass-making during the 18th and 19th centuries. Pewter was the chief material for producing plates, cups, and bowls until the making of porcelain.[citation needed] Mass production of pottery, porcelain and glass products have almost universally replaced pewter in daily life, although pewter artifacts continue to be produced, mainly as decorative or specialty items. Pewter was also used around East Asia. Although some items still exist,[7] Ancient Roman pewter is rare.[8]
Lidless mugs and lidded tankards may be the most familiar pewter artifacts from the late 17th and 18th centuries, although the metal was also used for many other items including porringers (shallow bowls), plates, dishes, basins, spoons, measures, flagons, communion cups, teapots, sugar bowls, beer steins (tankards), and cream jugs. In the early 19th century, changes in fashion caused a decline in the use of pewter flatware. At the same time, production increased of both cast and spun pewter tea sets, whale-oil lamps, candlesticks, and so on. Later in the century, pewter alloys were often used as a base metal for silver-plated objects.
In the late 19th century, pewter came back into fashion with the revival of medieval objects for decoration. New replicas of medieval pewter objects were created, and collected for decoration. Today, pewter is used in decorative objects, mainly collectible statuettes and figurines, game figures, aircraft and other models, (replica) coins, pendants, plated jewellery and so on. Certain athletic contests, such as the United States Figure Skating Championships, award pewter medals to fourth-place finishers.[9]
Pewter Ring
Pewter plate
Pewter vase
Pewter cream pitcher c. 1780
Types
In antiquity, pewter was tin alloyed with lead and sometimes copper. Older pewters with higher lead content are heavier, tarnish faster, and oxidation has a darker, silver-gray color.[10] Pewters containing lead are no longer used in items that will come in contact with the human body (such as cups, plates, or jewelry) due to the toxicity of lead. Modern pewters are available that are completely free of lead, although many pewters containing lead are still being produced for other purposes.[11]
A typical European casting alloy contains 94% tin, 1% copper and 5% antimony. A European pewter sheet would contain 92% tin, 2% copper, and 6% antimony. Asian pewter, produced mostly in Malaysia, Singapore, and Thailand, contains a higher percentage of tin, usually 97.5% tin, 1% copper, and 1.5% antimony. This makes the alloy slightly softer.[5]
So-called Mexican pewter is any of various alloys of aluminium used for decorative items.[12][13][14]
Pewter is also used to imitate platinum in costume jewelry.
Properties
As pewter is a softer material, it can be manipulated in various ways such as being cast, hammered, turned, spun and engraved.
Since pewter is soft at room temperature, a pewter bell does not ring clearly. Cooling it in liquid nitrogen hardens it and enables it to ring, but also makes it more brittle.[15]
See also
- Britannia metal
- English pewter
- Spin casting
- Solder
- Pewtet
Notes
- ↑ Richardson, Kathryn. "Pewter Casting Alloys". https://www.northernsmelters.com.au/pewter-casting-alloys.
- ↑ "Pewter". 2 July 2021. https://www.belmontmetals.com/product-category/pewter/.
- ↑ Campbell (2006), p. 207.
- ↑ Skeat (1893), pp. 438–439.
- ↑ 5.0 5.1 Hull (1992), p. 4.
- ↑ What is pewter? – The Pewter Society
- ↑ Brown (1973).
- ↑ "How to Identify Pewter Marks". gauk Auctions. 14 April 2015. http://governmentauctionsuk.com/antique-auction-guides/pewter.
- ↑ "Competitive Figure Skating FAQ: Rules and Regulations". www.frogsonice.com. http://www.frogsonice.com/skateweb/faq/rules.shtml#Q17.
- ↑ "Where Lead Hides". http://hydra.usc.edu/scehsc/pdfs/D-1-3-2%20Where%20Lead%20Hides.pdf.
- ↑ "Pewter: What It Is, Properties, Importance, Uses, and Advantages" (in en-us). https://www.xometry.com/resources/materials/what-is-pewter/#:~:text=Originally,%20pewter%20was%20a%2070,antimony,%20and%201.5%25%20copper..
- ↑ "Handcast Aluminum Pewter - Hecho en Mexico". Another Day In Paradise. December 2000. http://www.adip.info/2000_2001/dec/07_pewter.php.
- ↑ "FAQs". http://www.osterpewter.com/faqs/.
- ↑ "Pewter". http://www.copper-sink.com/pdf/Pewter_LOW.pdf.
- ↑ "LN2 demos: Pewter bell and spring, color change tube, LN2 cannon. | Lecture Demonstrations". http://berkeleyphysicsdemos.net/node/321.
References
- Brown, David (1973). "A Roman Pewter Hoard from Appleford, Berks.". Oxoniensia 38: 184–206. http://oxoniensia.org/volumes/1973/brown1.pdf.
- Campbell, Gordon (2006), The Grove encyclopedia of decorative arts (illustrated ed.), Oxford University Press, ISBN 978-0-19-518948-3, https://books.google.com/books?id=R8BMW6Au7pQC.
- Hull, Charles (1992), Pewter, Osprey Publishing, ISBN 978-0-7478-0152-8, https://books.google.com/books?id=dy5ZvgAACAAJ.
- Skeat, Walter William (1893), An etymological dictionary of the English language (2nd ed.), Clarendon Press, https://books.google.com/books?id=OHkKAAAAIAAJ.
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