Look up plaster in Wiktionary, the free dictionary.

Gypsum-based plaster used in spray fireproofing in a low-rise industrial building in Vancouver, British Columbia.

Plaster is a building material used for coating walls and ceilings. Plaster starts as a dry powder similar to mortar or cement and like those materials it is mixed with water to form a paste which liberates heat and then hardens. Unlike mortar and cement, plaster remains quite soft after setting, and can be easily manipulated with metal tools or even sandpaper. These characteristics make plaster suitable for a finishing, rather than a load-bearing material.

The term plaster can refer to gypsum plaster (also known as plaster of Paris), lime plaster, or cement plaster.

Types[link]

Gypsum plaster/Plaster of Paris[link]

Gypsum plaster, or Plaster of Paris, is produced by heating gypsum to about 300°F (150 °C):^[1]

CaSO₄·2H₂O + Heat → CaSO₄·½H₂O + 1½ H₂O (released as steam).

When the dry plaster powder is mixed with water, it re-forms into gypsum. The setting of unmodified plaster starts about 10 minutes after mixing and is complete in about 45 minutes; but not fully dry for 72 hours.^[2] If plaster or gypsum is heated above 392°F (200°C), anhydrite is formed, which will also re-form as gypsum if mixed with water.^[3]

A large gypsum deposit at Montmartre in Paris led gypsum plaster to be commonly known as "plaster of Paris".^[4]

Plasterers often use gypsum to simulate the appearance of surfaces of wood, stone, or metal, on movie and theatrical sets for example. Nowadays, theatrical plasterers often use expanded polystyrene, although the job title remains unchanged.

Plaster of Paris can be used to impregnate gauze bandages to make a sculpting material called modroc. It is used similarly to clay, as it is easily shaped when wet, yet sets into a resilient and lightweight structure. Set modroc is an early example of a composite material.

Lime plaster[link]

Lime plaster is a mixture of calcium hydroxide and sand (or other inert fillers). Carbon dioxide in the atmosphere causes the plaster to set by transforming the calcium hydroxide into calcium carbonate (limestone). Whitewash is based on the same chemistry.

To make lime plaster, limestone (calcium carbonate) is heated to produce quicklime (calcium oxide). Water is then added to produce slaked lime (calcium hydroxide), which is sold as a wet putty or a white powder. Additional water is added to form a paste prior to use. The paste may be stored in air-tight containers. Once exposed to the atmosphere, the calcium hydroxide turns back into calcium carbonate, causing the plaster to set.

Lime plaster was a common building material for wall surfaces in a process known as lath and plaster, whereby a series of wooden strips on a studwork frame was covered with a semi-dry plaster that hardened into a surface. The plaster used in most lath and plaster construction was mainly lime plaster, with a cure time of about a month. To stabilize the lime plaster during curing, small amounts of plaster of Paris were incorporated into the mix. Because plaster of Paris sets quickly, "retardants" were used to slow setting time enough to allow workers to mix large working quantities of lime putty plaster. A modern form of this method uses expanded metal mesh over wood or metal structures, which allows a great freedom of design as it is adaptable to both simple and compound curves. Today this building method has been partly replaced with drywall, also composed mostly of gypsum plaster. In both these methods a primary advantage of the material is that it is resistant to a fire within a room and so can assist in reducing or eliminating structural damage or destruction provided the fire is promptly extinguished.

Lime plaster is used for true frescoes. Pigments, diluted in water, are applied to the still wet plaster.

Cement plaster[link]

Cement plaster is a mixture of suitable plaster, sand, portland cement and water which is normally applied to masonry interiors and exteriors to achieve a smooth surface. Interior surfaces sometimes receive a final layer of gypsum plaster. Walls constructed with stock bricks are normally plastered while face brick walls are not plastered. Various cement-based plasters are also used as proprietary spray fireproofing products. These usually use vermiculite as lightweight aggregate. Heavy versions of such plasters are also in use for exterior fireproofing, to protect LPG vessels, pipe bridges and vessel skirts.

Uses[link]

In architecture[link]

19th century plasterwork from House of Borujerdies in Kashan, Iran.

Plasterwork in Pompeii (79 AD)

Plaster may also be used to create complex detailing for use in room interiors. These may be geometric (simulating wood or stone) or naturalistic (simulating leaves, vines, and flowers) These are also often used to simulate wood or stone detailing found in more substantial buildings.

In art[link]

Many of the greatest paintings in Europe, like Michelangelo's Sistine Chapel ceiling are executed in fresco, meaning they are painted on a thin layer of wet plaster, called intonaco (in fact the general term for plaster in Italian); the pigments sink into this layer so that the plaster itself becomes the medium holding them, which accounts for the excellent durability of fresco. Additional work may be added a secco on top of the dry plaster, though this is generally less durable.^{[citation needed]}

Plaster may be cast directly into a damp clay mold. In creating this piece molds (molds designed for making multiple copies) or waste molds (for single use) would be made of plaster. This "negative" image, if properly designed, may be used to produce clay productions, which when fired in a kiln become terra cotta building decorations, or these may be used to create cast concrete sculptures. If a plaster positive was desired this would be constructed or cast to form a durable image artwork. As a model for stonecutters this would be sufficient. If intended for producing a bronze casting the plaster positive could be further worked to produce smooth surfaces. An advantage of this plaster image is that it is relatively cheap; should a patron approve of the durable image and be willing to bear further expense, subsequent molds could be made for the creation of a wax image to be used in lost wax casting, a far more expensive process. In lieu of producing a bronze image suitable for outdoor use the plaster image may be painted to resemble a metal image; such sculptures are suitable only for presentation in a weather-protected environment.

Plaster expands while hardening, then contracts slightly just before hardening completely. This makes plaster excellent for use in molds, and it is often used as an artistic material for casting. Plaster is also commonly spread over an armature (form), usually made of wire, mesh or other materials, a process raised details. For these processes, limestone or acrylic based plaster may be employed.^{[citation needed]}

In medicine[link]

Plaster is widely used as a support for broken bones; a bandage impregnated with plaster is moistened and then wrapped around the damaged limb, setting into a close-fitting yet easily removed tube, known as an orthopedic cast; however, this is slowly being replaced by a fibreglass variety.

Plaster is also used within radiotherapy when making immobilization casts for patients. Plaster bandages are used when constructing an impression of the patients head and neck, and liquid plaster is used to fill the impression and produce a plaster bust. Perspex is then vacuum formed over this bust creating an immobilization shell.^{[citation needed]}

In dentistry, plaster is used for mounting casts or models of oral tissues. These diagnostic and working models are usually made from dental stone, a stronger, harder and denser derivative of plaster which is manufactured from gypsum under pressure. Plaster is also used to invest or flask wax dentures, the wax being subsequently removed and replaced with the final denture base material which is cured in the plaster mold.^{[citation needed]}

In fire protection[link]

Plasters have been in use in passive fire protection, as fireproofing products, for many decades.

The finished plaster releases water vapor when exposed to flame, acting to slow the spread of the fire, for as much as an hour or two depending on thickness. It also provides some insulation to retard heat flow into structural steel elements, that would otherwise lose their strength and collapse in a fire. Early versions of these plasters have used asbestos fibres, which have by now been outlawed in industrialized nations and have caused significant removal and re-coating work. More modern plasters fall into the following categories:

• fibrous (including mineral wool and glass fiber)
• cement mixtures either with mineral wool or with vermiculite
• gypsum plasters, leavened with polystyrene beads, as well as chemical expansion agents to decrease the density of the finished product

One differentiates between interior and exterior fireproofing. Interior products are typically less substantial, with lower densities and lower cost. Exterior products have to withstand more extreme fire and other environmental conditions. Exterior products are also more likely to be attractively tooled, whereas their interior cousins are usually merely sprayed in place. A rough surface is typically forgiven inside of buildings as dropped ceilings often hide them. Exterior fireproofing plasters are losing ground to more costly intumescent and endothermic products, simply on technical merit. Trade jurisdiction on unionized construction sites in North America remains with the plasterers, regardless of whether the plaster is decorative in nature or is used in passive fire protection. Cementitious and gypsum based plasters tend to be endothermic. Fireproofing plasters are closely related to firestop mortars. Most firestop mortars can be sprayed and tooled very well, due to the fine detail work that is required of firestopping, which leads their mix designers to utilise concrete admixtures, that enable easier tooling than common mortars.

Safety issues[link]

The chemical reaction that occurs when plaster is mixed with water is exothermic in nature and can therefore cause severe burns. The potential dangers were demonstrated in January 2007, when a sixteen-year-old girl suffered third-degree burns after encasing her hands in a bucket of plaster as part of a school art project in Lincolnshire, England. The burns were so severe that she subsequently had both thumbs and six of her fingers amputated.^[5][6][7] For this reason only thin layers of plaster should be used, with time to cool between layers, or strips of cloth in plaster laid-up in the method used by the medical field. In place of plaster, alginate can safely be used for casting body parts.

Some variations of plaster that contain powdered silica or asbestos may present health hazards if inhaled. Asbestos is a known irritant when inhaled in powder form can cause cancer, especially in people who smoke, and inhalation can also cause asbestosis. Inhaled silica can cause silicosis and (in very rare cases) can encourage the development of cancer. Persons working regularly with plaster containing these additives should take precautions to avoid inhaling powdered plaster, cured or uncured. (Note that asbestos is rarely used in modern plaster formulations because of its carcinogenic^[8] effects.)

See also[link]

Look up plaster in Wiktionary, the free dictionary.

References[link]

1. ↑ Staff. "CaSO4 , ½ H2O". LaFargePrestia. http://www.lafargeprestia.com/caso4___h2o.html. Retrieved 27 November 2008. 
2. ↑ Schmidt, V.E.; Somerset, J.H.; Porter, R.E. (1973). "Mechanical Properties of Orthopeadic Plaster Bandages". Journal of Biomechanics (Elsevier) 6: p173-185. 
3. ↑ Deer, Howie, & Zussman. "An Introduction to the Rock Forming Minerals." Pearson Education Limited, England, 2nd Edition, 1992, Page 614. ISBN 0-582-30094-0
4. ↑ plaster of Paris definition. Webster's New World College Dictionary at YourDictionary.com.
5. ↑ "Amputation after art class burns". BBC News. 2007-03-23. http://news.bbc.co.uk/1/hi/education/6485481.stm. Retrieved 2010-05-22. 
6. ↑ "Fine as art pupil loses fingers". BBC News. 2009-10-12. http://news.bbc.co.uk/1/hi/england/lincolnshire/8303246.stm. Retrieved 2010-05-22. 
7. ↑ Britten, Nick (2009-10-13). "Schoolgirl, 16, lost eight fingers in plaster of Paris accident during art lesson". The Daily Telegraph (London). http://www.telegraph.co.uk/news/newstopics/politics/lawandorder/6311398/Schoolgirl-16-lost-eight-fingers-in-plaster-of-Paris-accident-during-art-lesson.html. Retrieved 2010-05-22. 
8. ↑ Hazardous chemicals: second report on the inquiry into hazardous chemicals. Canberra : Australia: Australian Government Publications Service. 1982. OCLC 66780789. "The carcinogenic activity of asbestos derives from its morphology, not its chemical nature" 

Marina and the Diamonds
Marina and the Diamonds performing in Edinburgh on 2 November 2010
Background information
Birth name	Marina Lambrini Diamandis
Born	(1985-10-10) 10 October 1985 (age 26) Abergavenny, Monmouthshire, Wales
Genres	indie pop, pop, New Wave, electropop
Occupations	Singer-songwriter, musician poet,
Instruments	Vocals, keyboard, piano, glockenspiel, casio VL-tone, organ
Years active	2007–present
Labels	Neon Gold, 679, Chop Shop
Website	marinaandthediamonds.com

Marina Lambrini Diamandis^[1] (Greek: Μαρίνα-Λαμπρινή Διαμάντη, pronounced [ðʝaˈmadi];^[2] born 10 October 1985), better known by her stage name Marina and the Diamonds (sometimes stylised as Marina & the Diamonds), is a Welsh singer-songwriter.^[3][4] She rose to fame after reaching number two on the BBC Sound of 2010 poll list, coming second to Ellie Goulding. After releasing one private EP, Diamandis released her second extended play, The Crown Jewels EP, with help from Neon Gold Records, in 2009.^[5] Now signed to 679 Recordings, she released her debut full length studio album, The Family Jewels, followed by her third extended play, The American Jewels EP, in 2010. In 2011, Diamandis announced that she was working on her second album, Electra Heart, which was released in April 2012 and went to #1 in the UK and Ireland.

Her stage name, "Marina and the Diamonds", consists of Diamandis' first name and the translation of her surname which means "Diamonds" in Greek. Although "The Diamonds" is often mistakenly believed to refer to her backing band,^[6] it in fact refers to Diamandis' fans: she explains this on her Myspace page by saying "I'm Marina. You are the diamonds."^[7]

Diamandis' musical style ranges from keyboard-based ballads to more up-tempo New Wave-style songs with full band backing.^[4] She has cited a wide-range of influences such as Daniel Johnston, Blondie, The Distillers, Patti Smith, Tom Waits, Nirvana, PJ Harvey, Kate Bush, Britney Spears, Yann Tiersen, Elliott Smith, Dolly Parton and Madonna.^[8][9]

Background[link]

Diamandis was born in Abergavenny, Monmouthshire, Wales. Her father is Greek and her mother is Welsh,^[10] and brought up in the village of Pandy with her parents and her older sister.^[11] She attended Haberdashers' Monmouth School for Girls, of which she said "I sort of found my talent there... I was the one who always skived off choir, but I had an incredible music teacher who managed to convince me I could do anything."^[12] When her parents separated, Diamandis moved to Greece when she was sixteen years old to live with her father but returned to Wales two years later.^[11]

Diamandis moved to London at the age of eighteen where she attended dance school for only two months.^[6] Following this, in 2005 she took a one year singing course at Tech Music Schools.^{[citation needed]} Diamandis enrolled in a music degree at the University of East London, transferring in her second year of studies to Middlesex University, but later dropped out.^[13] She went for many auditions including the West End musical, The Lion King.^[14] Diamandis admitted that she auditioned for a reggae boy band, held by Virgin Records, in 2005 to try to make it into the music business. She said she was "delusional with drive" and ultimately decided to dress up in male attire to try to amuse the record label to sign her, but she was unsuccessful. However, she was called back by the record label a week later.^[15][16]

Diamandis has a synaesthetic condition that involves seeing musical notes and days of the week in different colours.^[17]

Musical career[link]

2005–2008: Early career[link]

Diamandis live at the NME Radar Tour

In 2005, Diamandis created the name "Marina and the Diamonds".^[18] When describing the origin of the name, she said:

I never envisaged a character, pop project, band or solo artist. I saw a simple group made up of many people who had the same hearts. A space for people with similar ideals who could not fit in to life's pre-made mould. I was terribly awkward for a long time! I really craved to be part of one thing because I never felt too connected to anybody and now I feel I have that all around me.^[18]

Early demos of Marina and the Diamonds' songs were self composed and produced on the Apple software application Garageband.^[14] Through Gumtree she found someone to produce a few tracks, for which she paid £500.^[19] These ended up on her debut extended play Mermaid Vs. Sailor EP which was released on 23 November 2007. The record was created on hand-made CD-Rs by Diamandis and sold through her MySpace page. An estimated seventy copies were sold overall.^[20]

In January 2008, Diamandis was first discovered by music scouter Derek Davies of Neon Gold Records. Davies booked Diamandis to open for Belgian-Australian singer Gotye later that year where Warner Music Group first saw her and ended up signing her in October 2008 to 679 Recordings.^[19]

Marina and the Diamonds performing at The Bell House in Brooklyn, New York.

Diamandis' debut single was a double a-side consisting of "Obsessions" and "Mowgli's Road" which was issued on Neon Gold Records in the United States on 19 November 2008, followed by her second extended play The Crown Jewels EP on 1 June 2009 featuring her second single "I Am Not a Robot".^[21] Her first major label single, a re-recording of "Mowgli's Road", was released on 13 November 2009 under 679 Recordings in the UK and through Atlantic Records in the USA. On 7 December 2009 she was listed on the longlist for the BBC Sound of 2010 poll,^[22] and on 7 January 2010 it was announced that she had taken second place.^[23]

[edit] 2009–2010: The Family Jewels

Marina and the Diamonds' debut album, The Family Jewels, was released in February 2010. It peaked at number five on the UK Albums Chart and was certified silver in the United Kingdom days before its release.^[24] A re-release of "Mowgli's Road" was released as the album's lead single in November 2009.^[25] However, the song "Hollywood" was released as the first major single from the album in February 2010.^[26] A re-release of "I Am Not a Robot" in April 2010 became the album's third single; Diamandis said she decided to re-release the song because "people seem to empathize and relate with the song, regardless of gender or age."^[27] "Oh No!" became the album's fourth single in August 2010,^[28] and "Shampain" became the fifth single in October 2010.^[29] She embarked on her first headlining tour on 14 February 2010, consisting of seventy dates around the United Kingdom, Ireland, mainland Europe, the United States and Canada.^[30]

Also during 2010, Diamandis collaborated with producer Benny Blanco and guitarist Dave Sitek in Los Angeles on new material which she described as "a really great opportunity for me as a songwriter. [We are] such a weird threesome—a combination of super pop and really indie".^[6]

In March 2010, Atlantic Records signed Marina and the Diamonds to Chop Shop Records in the United States.^[31][32] Before the album's American release in May 2010,^[33] Diamandis released her third extended play, The American Jewels EP, digitally and exclusively for the United States in March 2010.^[31][32] Diamandis made her North American debut on 14 March 2010 through a series of performances.^[34]

Marina and the Diamonds was nominated for Critics' Choice at the 2010 BRIT Awards^[35] and came fifth in SHREDnews' "Ten Artists To Watch in 2010" list in March 2010.^[36] She also won the award for Best UK & Ireland Act at the 2010 MTV Europe Music Awards.^[37]

[edit] 2011–present: Electra Heart

In a January 2011 interview, Diamandis announced that her second album would mainly be about female sexuality and feminism.^{[citation needed]} The same month, Diamandis was announced as a support act for the U.S. leg of Katy Perry's California Dreams Tour.^[38] Three early demos were leaked in early 2011, called "Sex, Yeah", "Living Dead" and "Jealousy", each showing a more pop sound.^[39] Diamandis recorded material with producers Cirkut, Guy Sigsworth, Labrinth, Greg Kurstin, Diplo, Dr. Luke, Stargate and Liam Howe.

In August 2011, Diamandis uploaded a video to her YouTube page titled "Part 1: Fear and Loathing". In an interview with Popjustice, she explained the concept of the album, titled Electra Heart after a character of her creation; she said the guise "epitomises and embodies the lies, illusions and death of American ideologies involved in the corruption of self [...] Electra Heart is the antithesis of everything that I stand for. And the point of introducing her and building a whole concept around her is that she stands for the corrupt side of American ideology, and basically that’s the corruption of yourself. My worst fear—that’s anyone’s worst fear—is losing myself and becoming a vacuous person. And that happens a lot when you’re very ambitious."^[40] The campaign's first single, "Radioactive" produced by Stargate, was released in October 2011 (reaching number twenty-five in the UK),^[41] followed by a demo of the song "Starring Role" in November^[42] and a video titled ♡ PART 3: "THE ARCHETYPES" ♡ in December.^[43] A track titled "Homewrecker" was issued as a free download to her mailing list subscribers.^[44]

Electra Heart was released in April 2012,^[45] preceded by the single "Primadonna" produced by Dr Luke, Diplo and Cirkut.^[46][47] "Primadonna" debuted at number eleven on the UK Singles Chart, becoming Diamandis' highest peaking single to date. "Power and Control" has been announced officially as the next single from the album.^[48]

Artistry[link]

Music style and influences[link]

Marina and the Diamonds performing on The Gem Tour in Birmingham, UK.

Marina and the Diamonds has been influenced by a wide-range of musicians from PJ Harvey to Britney Spears.^[8] Diamandis has also noted Daniel Johnston as one of her major influences saying:

He really opened me up to a whole new world of music and a whole new perception of what an artist is. For me, he really encouraged me because if you think of someone who has been spoon-fed pop, up until twenty-one years old, and you hear someone like Daniel Johnston you're like "God, this is terrible, but I love it." It sounds like a child has made it, like, the production is so all over the place. He's obviously got something very captivating here yet he doesn't fit the normal mould and people still love him. I thought "if he can do it then [so can I]," that's when I started to produce things myself and play live, even though I wasn't even great on the piano. It's all about emotion and if you have heart, people connect to that.^[49]

Diamandis calls herself a "DIY musician"^[49] and describes her sound as an alternative to mainstream pop music.^[8] In an interview with ClashMusic Diamandis said that she does not come from a musical background and explained "I probably have a bit of a different sound because I don’t really know what I’m doing".^[50] Lyrically, she says her music analyzes people and that if she wasn't a musician, she would be a psychologist.^[51]

Critics usually catalogue Marina and the Diamonds as a New Wave pop artist. In an interview with The Guardian she said, "I suppose I'm an indie artist with pop goals".^[9] Although Diamandis has asserted that she never tries to sound like any other artist or copy a genre of music, she has been compared to a variety of artists such as Kate Bush^[50] and most commonly Florence and the Machine.^[52] PopMatters commented on her vocal delivery and attitude saying it "has a tendency to overshadow the music, which is often melodically inventive, but we are rarely given the chance to realise this."^[53] The Guardian's Paul Lester wrote that "her songs are hard to fathom. They veer between simple keyboards-based ballads and more upbeat and catchy, quirky new wave-inflected numbers enhanced by percussion, guitar and drums."^[4]

Public image[link]

As well as her music, Marina and the Diamonds is also notable for her unique attire.^[54] When asked in an interview to describe her fashion style in three words, Diamandis said "vintage, cheerleader and cartoon".^[55] You can see an element of this style in the video for 'Oh No!' which was released in June 2010. She has praised model/DJ Leigh Lezark's fashion style and called Gwen Stefani her definitive style icon describing her image as "cartoonized but in a very fresh way".^[55] Diamandis has mentioned that she sometimes makes her own outfits with clothes she buys from charity shops.^[56] She also collects vintage cheer jackets.^[55] She has often been seen wearing clothes by Jean-Charles de Castelbajac,^[57] Laura Mackness,^[58] Beyond Retro,^[59] Motel Rocks,^[60] Jervoise Jackets^[61] amongst others. Diamandis has admitted that she would "like to do something in fashion, not designing, not one of those skanky celebrity lines, but being involved behind the scenes".^[11]

As part of Selfridges' "Sound of Music", Diamandis designed her own window display for the London Oxford Street branch in May 2010.^[62] She also appeared as a "live mannequin" for the display.^[63] Diamandis was featured on Vogue UK's official website throughout November 2010 for a popular sartorial section called "Today I'm Wearing", where she blogged her daily style choices for the fashion website.^[64] In December 2010, Diamandis announced on her Twitter that she would be the new face of the Max Factor make-up range Max Colour Effects.

Discography[link]

• 2010: The Family Jewels
• 2012: Electra Heart

Filmography[link]

• 2013: Homewrecker (Set to be released in Summer 2013)

Touring[link]

Marina and the Diamonds at The Wonder Bar in Asbury Park, NJ

In 2009, Marina and the Diamonds played at BBC Radio 1's Big Weekend in Swindon early in May 2009,^[3] Glastonbury Festival in June 2009,^[65] and the Reading and Leeds Festivals in August 2009.^[66]

In promotion for her album and "Hollywood", Diamandis performed at Brand New: 10 for 10 at London's Dingwalls,^[67] had an eleven minute 4Music special - 4Play: Marina and the Diamonds - on Channel 4,^[68] performed at T4's Outside-In Festival,^[69] New to Q Sessions^[70] in January 2010, was a musical guest on GMTV, Friday Night with Jonathan Ross, The Review Show in February 2010^[71] and Later... with Jools Holland and T4's Frock Me! in April 2010. She performed at the Isle of Wight Festival 2010 and Glastonbury Festival 2010 in June 2010 and is planned to appear at other music festivals across the United Kingdom, mainland Europe and North America.

Diamandis had already sold out the first leg of her first headlining tour, The Family Jewels Tour before the release of her debut album. Her entire tour currently consists of seventy dates across six legs around the United Kingdom, North America, Ireland and mainland Europe.^[30][72][73] Diamandis was accompanied by support acts Clock Opera and Alan Pownall for the first leg of her tour and Spark on The Gem Tour.^[74]

Headlining

• The Family Jewels Tour (2010 - 2011)
• Lonely Hearts Club Tour (2012)

Supporting

• California Dreams Tour (2011)
• Mylo Xyloto Tour (2011 - 2012)

Awards and nominations[link]

References[link]

External links[link]

Wikimedia Commons has media related to: Marina and the Diamonds

• Official website
• Marina and the Diamonds on BBC Wales
• Today I'm Wearing at Vogue UK