Neoprene

== Description ==
A family of synthetic rubbers made by polymerizing chlorinated butadiene. Chloroprene was first developed by DuPont in 1931 by Ira Williams and sold under the name of DuPrene in 1932. In 1936, DuPont changed its brand name to Neoprene; now neoprene is a generic term used for this class of synthetic rubbers. Neoprene is vulcanized with metal oxides rather than sulfur which makes it less elastic than rubber, but more resistant to chemicals, heat, and light. It is also resistant to water and biodegradation. Neoprene has a service temperature range of -50 to 95 C and has good compressibility. Neoprene is used for gaskets, roof coatings, shoe soles, wet suits, gloves, contact adhesives, and as a coating for fabrics.
Neoprene adhesives and coatings are typically anionic colloidal dispersions in aqueous solutions. The adhesives can be repaired as pressure sensitive or heat activated forms. The coatings and sealants have additives to vary viscosities and surface penetration levels. 
Chloroprene is on the ILFI Red list of building materials.
== Synonyms and Related Terms ==
chloroprene; polychloroprene; poly(2-chloro-1,3-butadiene); neoprene foam; neopreno (Esp.); néoprène (Fr.); neoprene (It.); neopreno (Port.); 
Examples: Butaclor® [PolimeriEuropa]; Baypren® [Lanxess]; Sovprene (Russian); Mustone (Japan); DuPrene [DuPont]; GR-M, Evostik [Evode]; Pattex [Henkel]; Butyl [Standard Oil Co.]
== Personal Risks ==
[[[SliderGallery rightalign|aaiNEOPRENE.jpg~FTIR]]]
Federal Mogul: [Safety Data Sheet]
== Collection Risks ==
Fire-retardant.
== Physical and Chemical Properties ==
* Resistant to water, oils and most chemicals
* Soluble in chlorinated and aromatic hydrocarbons
Composition	(CH3ClC:CHCH3)n
CAS 	126-99-8
Density 	1.23 g/ml
Examples characteristics and compositions for the Denka series are:
Product Grade	Solids Content %	Characteritics 	Data sheets
Neoprene 571 	50 	high tensile strength 	[website]
Neoprene 671A	59 	general purpose 	[website]
Neoprene 750 	50 	excellent flexibility 	[website]
Neoprene 842A	50 	fast curing, low modulus	[website]
==Resources and Citations==
* Denka Neoprene (formerly DuPont) Website 
* M.Steinfink, "Neoprene Adhesives: Solvent and Latex" in Handbook of Adhesives, I.Skeist (ed.), Van Nostrand Reinhold, New York, 1977, p.343-367.
* Fairchild's Dictionary of Textiles, Phyllis G.Tortora, Robert S. Merkel (eds.), Fairchild Publications, New York City, 7th edition, 1996
* History of Plastic: [www.nswpmith.com.au/historyofplastics.html Website]
* Irving Skeist, Handbook of Adhesives, Van Nostrand Reinhold Company, New York, 1977 Comment: ..The first public announcement of this polymer was made in 1931, commercialization began in April 1932. At first known as DuPrene, the polymer was designated neoprene by DuPont in 1936
* M. Baker, E. McManus, 'History, Care and Handling of America's Spacesuits', JAIC, 31, 77-85, 1992
* G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 680
* Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
* Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
* Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
* Thomas C. Jester (ed.), Twentieth-Century Building Materials, McGraw-Hill Companies, Washington DC, 1995
* Edward Reich, Carlton J. Siegler, Consumer Goods: How to Know and Use Them, American Book Company, New York City, 1937 Comment: p. 285
* Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
* Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
* The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
* Art and Architecture Thesaurus Online, https://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
Category:Materials database