Ammonium alum

Ammonium alum

Ammonium alum (NH4Al(SO4)2·12H2O) or ammonium aluminium sulfate dodecahydrate is a white crystalline double sulfate of aluminium, used in water purification, in vegetable glues, in porcelain cements, in natural deodorants and in tanning, dyeing and in fireproofing textiles. [ [http://www.questia.com/library/encyclopedia/alum.jsp Alum: Free Encyclopedia Articles at Questia.com Online Library ] ]

The pH of the solution resulting from the topical application of ammonium alum with perspiration is typically in the slightly acid range, from 4 to 5. [ [http://www.jtbaker.com/msds/englishhtml/a2760.htm Aluminum Ammonium Sulfate ] ] It is a popular deodorant because of its high availability and low costFact|date=January 2008. A 120 gram stone lasts for at least a year of daily usage - much longer than other deodorants and antiperspirants. It is also hypoallergenic and non-stainingFact|date=January 2008. Potassium alum is also used for this purpose.

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  • ammonium alum — n ALUM (1b) * * * [USP] alum prepared with the addition of ammonium; used topically as an astringent …   Medical dictionary

  • ammonium alum — noun a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum • Syn: ↑alum, ↑ammonia alum • Hypernyms: ↑aluminum, ↑aluminium, ↑Al, ↑atomic number 13, ↑double salt * * * …   Useful english dictionary

  • ammonium alum — aliuminio amonio alūnas statusas T sritis chemija formulė NH₄Al(SO₄)₂·12H₂O atitikmenys: angl. aluminium ammonium alum; aluminium ammonium disulfate; aluminium ammonium sulfate; ammonium alum rus. алюминиево аммониевые квасцы ryšiai: sinonimas –… …   Chemijos terminų aiškinamasis žodynas

  • ammonium alum — Chem. See aluminum ammonium sulfate. * * * …   Universalium

  • aluminium-ammonium alum — aliuminio amonio alūnas statusas T sritis chemija formulė NH₄Al(SO₄)₂·12H₂O atitikmenys: angl. aluminium ammonium alum; aluminium ammonium disulfate; aluminium ammonium sulfate; ammonium alum rus. алюминиево аммониевые квасцы ryšiai: sinonimas –… …   Chemijos terminų aiškinamasis žodynas

  • ferric ammonium alum — geležies amonio alūnas statusas T sritis chemija formulė (NH₄)Fe(SO₄)·12H₂O atitikmenys: angl. ammonio feric sulfate; ferric ammonium alum; iron ammonium sulfate rus. железо аммониевые квасцы ryšiai: sinonimas – amonio geležies… …   Chemijos terminų aiškinamasis žodynas

  • Alum — This article is about the chemical compound. For other uses, see Alum (disambiguation). Bulk alum Alum (  / …   Wikipedia

  • alum — alum1 /al euhm/, n. Chem. 1. Also called potash alum, potassium alum. a crystalline solid, aluminum potassium sulfate, K2SO4·Al2(SO4)3·24H2O, used in medicine as an astringent and styptic, in dyeing and tanning, and in many technical processes. 2 …   Universalium

  • alum — A double sulfate of aluminum and of an alkaline earth element or ammonium; chemically, an a. is any one of the markedly astringent double salts formed by a combination of a sulfate of aluminum, iron, manga …   Medical dictionary

  • alum-hematoxylin — A purple nuclear stain used in histology; a mixture of an aqueous solution of ammonium alum and an alcoholic solution of hematoxylin which is ripened or oxidized to …   Medical dictionary

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