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| : ''This article is about the European Community system for coding chemicals. For the Enzyme Commission codes, see [[Enzyme Commission number]].''
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| The '''European Community number''', or '''EC number''', also known as '''EC No.''', '''EINECS No.''', and '''EC#''', is a [[unique]] seven-digit [[identifier]] that is assigned to chemical substances for [[regulatory]] purposes within the [[European Union]] by the regulatory authorities. The list of substances having an EC number is called the ''EC Inventory''.<ref>{{cite web
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| | url = http://echa.europa.eu/documents/10162/17235/substance_id_en.pdf
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| | title = Guidance for identification and naming of substances under REACH and CLP
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| | accessdate = 2011-12-18
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| | author = European Chemicals Agency
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| | date = | year = 2011 | month = November
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| | work =
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| | pages = 118 | format = pdf
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| }}</ref>
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| == Structure ==
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| The EC Number may be written in a general form as: NNN-NNN-R,<ref>{{cite journal
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| | first = European Commission
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| | date = August 21, 2001
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| | title = Commission Directive 2001/59/EC of 6 August 2001 adapting to technical progress for the 28th time Council Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances
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| | journal = Official Journal of the European Communities
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| | volume = | issue = L 225 | page = 4
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| | url = http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2001:225:0001:0333:EN:PDF
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| | format = pdf | accessdate = 2011-12-18
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| }}</ref> where R is a check digit and N represents integers. The check digit is calculated using the [[International Standard Book Number#Check digits|ISBN]] method. According to this method, the check digit R is the following sum [[modular arithmetic|modulo]] 11:
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| :<math>R = (N_1 + 2 N_2 + 3N_3 + 4N_4 + 5N_5 + 6N_6) \mod 11</math>
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| If the remainder R is equal to 10, that combination of digits is not used for an EC number. To illustrate, the EC number of [[dexamethasone]] is 200-003-9. N<sub>1</sub> is 2, N<sub>2</sub> through N<sub>5</sub> are 0, and N<sub>6</sub> is 3.
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| :<math>\frac{2 + 2\!\times\!0 + 3\!\times\!0 + 4\!\times\!0 + 5\!\times\!0 + 6\!\times\!3}{11} = \frac{20}{11} = 1 + \frac{9}{11}</math>
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| The remainder is 9, which is the check digit.
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| == Official EC inventory ==
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| The EC Inventory includes the substances in the following inventories. The content of these inventories is fixed and official.
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| {|class="wikitable"
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| !Inventory
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| !Scope
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| !Format
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| !No. of entries (if fixed No. of entries)
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| |-
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| | European Inventory of Existing Commercial Chemical Substances, (EINECS)
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| |Substances, excluding polymers, that were recorded as being commercially available in the EU from 1 January 1971 to 18 September 1981.<ref>{{cite journal |doi=10.1080/02772249209357850}}</ref> These were considered registered under Article 8(1) of the [[Dangerous Substances Directive (67/548/EEC)]]. They are considered phase-in substances under the [[REACH Regulation]]
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| |2xx-xxx-x<br/>3xx-xxx-x
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| | 100,204
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| |-
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| |European List of Notified Chemical Substances, (ELINCS)
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| |Substances notified under the Dangerous Substances Directive Notification of New Substances (NONS) that became commercially available after 18 September 1981 {{Citation needed|date=July 2009}}.
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| |4xx-xxx-x
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| |4,381
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| |-
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| |No Longer Polymers (NLP)
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| |The definition of polymers was changed in April, 1992<ref>{{cite journal
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| | last = European Commission
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| | date = 30 April 1992
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| | title = Council Directive 92/32/EEC of 30 April 1992 amending for the seventh time Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances
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| | journal = Official Journal of the European Communities
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| | volume = | issue = L 154 | pages = 1–29
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| | url = http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31992L0032:EN:HTML
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| | format = pdf | accessdate = 2009-01-25
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| }}
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| </ref> with the result that substances previously considered to be polymers were no longer excluded from regulation. Consequently, a list, called the NLP-list, was made of such substances that were commercially available between after 18 September 1981 and 31 October 1993.<ref>{{cite journal
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| | first = European Commission
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| | date = December 31, 2008
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| | title = Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labeling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006
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| | journal = Official Journal of the European Communities
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| | volume = | issue = L 353 | page = 329
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| | url = http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2008:353:0001:1355:EN:PDF
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| | format = pdf | accessdate = 2009-01-24
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| }}
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| </ref>
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| |5xx-xxx-x
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| |703
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| |}
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| == List numbers ==
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| [[ECHA]] also applies the EC number format to what it calls "List numbers".<ref>http://apps.echa.europa.eu/registered/registered-sub.aspx</ref> The number are assigned by when a substance is pre-registered or inquired about under the REACH Regulation. They are not official because they have not been published in the [[Official Journal of the European Union]]. The number of these two categories is open ended, as substances are continually being added.
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| {|class="wikitable"
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| !Scope
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| !Format
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| |-
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| |Automatically assigned, e.g. to pre-registrations of substances with a CAS No.
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| |6xx-xxx-x
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| |-
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| |Assigned to substances after inquiries by the ECHA Substance ID Team
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| |7xx-xxx-x
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| |-
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| |Automatically assigned to substances identified only with a CAS No. (continuation of the 6xx-xxx-x series)
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| |8xx-xxx-x
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| |-
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| |Automatically assigned, e.g. to pre-registrations without a CAS No. or other numerical identifier (including reaction masses of more than one substance)
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| |9xx-xxx-x
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| |}
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| ==See also==
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| * [[Registration, Evaluation, Authorisation and Restriction of Chemicals]]
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| * [[European chemical Substances Information System]]
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| * [[CAS registry number]]
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| ==References==
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| {{Reflist}}
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| ==External links==
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| * [http://esis.jrc.ec.europa.eu/ ESIS] European Chemical Substances Information System, where EC numbers can be looked up.
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| * [http://www.chemsynthesis.com/einecs-numbers/page-1.html EINECS numbers list] from Chemsynthesis
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| * [http://www.ovid.com/site/products/fieldguide/EINECS/eine.htm Ovid] Summary of legislation related to EC numbers
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| {{DEFAULTSORT:Ec Number (Chemistry)}}
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| [[Category:Chemical numbering schemes]]
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| [[Category:European Union law]]
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The writer's name is Andera and she believes it sounds fairly great. My wife and I live in Mississippi and I adore each day living right here. As a woman what she really likes is style and she's been doing it for quite a while. Invoicing is my occupation.
My page ... phone psychic readings