Cas is the name of a substance chemistry. CAS registration number

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casper registration number, casey's general store registration number
CAS registry number(aka CAS number, CAS RN, CAS#) - a unique numerical identifier of chemical compounds, polymers, biological sequences of nucleotides or amino acids, mixtures and alloys included in the Chemical Abstracts Service registry. The term does not have an unambiguous translation into Russian.

The CAS number is written as three groups of Arabic numerals separated by hyphens.

The Chemical Abstracts Service, a division of the American Chemical Society, assigns this identifier to all substances ever mentioned in the literature. The unique identifier is designed to make it easier to find references in the literature by eliminating the problem of a possible different name for the same one. Currently, almost all chemical databases are searchable by CAS registration number.

CAS itself maintains and sells a chemical database, the CAS registry. As of May 2, 2014, the registry contains more than 100 million substances, with approximately 15,000 new ones being added daily.

1 Format
2 Isomers, enzymes, mixtures
3 Search
4 Criticism of the registration number system
5 See also substance codes in databases
6 Notes
7 Links

Format

The CAS registration number is a sequence of digits separated by hyphens into three sections; the first part can contain up to 7 digits, the second contains two digits, the third consists of one digit and acts as a control character. The numbers are assigned in ascending order and have no predetermined meaning. The checksum is calculated by adding the last digit of the number multiplied by 1, the second digit from the right multiplied by 2, the third digit multiplied by three, and so on up to the first digit from the left, ending with the remainder of 10. For example, the CAS registration number for water is 7732 -18-5. The checksum is calculated as follows: 8x1 + 1x2 + 2x3 + 3x4 + 7x5 + 7x6 = 105; 105 mod 10 = 5.

Isomers, enzymes, mixtures

Individual molecular isomers also receive their own CAS number. For example, D-glucose is numbered 50-99-7, L-glucose is numbered 921-60-8; α-D-glucose - 26655-34-5 etc.

Sometimes a single CAS number is assigned to a whole separate class: the group of alcohol dehydrogenases is numbered 9031-72-5.

An example when a number is defined for a mixture is mustard oil (8007-40-7) - by this number you can immediately understand that it is not fatty mustard oil that is meant, but natural mustard essential oil - consisting, however, of almost pure allyl isothiocyanate - CAS 57-06-7.

Search

When using CAS numbers for database searches, it is useful to include the numbers of closely related compounds in the query as well. For example, to search for information about cocaine (CAS 50-36-2), you also need to search for cocaine hydrochloride (CAS 53-21-4), since this particular form of the compound is more common as a drug.

Criticism of the registration number system

"Established for last years CAS monopoly on rendering paid service for assignment serial number, which does not carry any chemical information, in many cases makes it difficult to use it as a code / pointer to refer to information "

Notes

American Chemical Society. CAS REGISTRY and CAS Registry Number FAQs. Retrieved May 2, 2014.
N. N. Afonina et al. DEVELOPMENT OF THE DATA BANK OF VINITI INFORMATION RESOURCES IN CHEMISTRY AND CHEMICAL TECHNOLOGY: FROM STRUCTURAL DATA TO MATERIAL CHEMISTRY AND TECHNOLOGY

CAS Registration Number Information About

CAS registry number(aka CAS number, CAS RN, CAS# ) - a unique numerical identifier of chemical compounds, polymers, biological sequences of nucleotides or amino acids, mixtures and alloys entered in the register Chemical Abstracts Service *. The unique identifier is designed to make it easier to find references in the literature by eliminating the problem of a possible different name for the same one.

The CAS registration number is a sequence of digits separated by hyphens into three sections; the first part can contain up to 7 digits, the second contains two digits, the third consists of one digit and acts as a control character. The numbers are assigned in ascending order and have no predetermined meaning. The checksum is calculated by adding the last digit of the number multiplied by 1, the second digit from the right multiplied by 2, the third digit multiplied by three, and so on up to the first digit from the left, ending with the remainder of 10. For example, the CAS registration number for water is 7732 -18- 5 . The checksum is calculated as follows: 8x1 + 1x2 + 2x3 + 3x4 + 7x5 + 7x6 = 105; 105 mod 10 = 5.

The CAS number is written as three groups of Arabic numbers separated by hyphens.

In the case of self-filling in the form of information on the composition of products Special attention is given to the selection of the CAS number. In fact, this is such a unique number that is assigned to an element, a mixture, in some cases an entire separate class and is necessary to clarify the component. For example, let's take oil. Butter is butter, sunflower, motor, and each of them has its own unique CAS identifier. Also, when developing an industrial safety policy, the specificity of the hazard class is determined by the CAS number.

Isomers, enzymes, mixtures

Individual molecular isomers also receive their own CAS number. For example, D-glucose is numbered 50-99-7, L-glucose is numbered 921-60-8; α-D-glucose - 26655-34-5, etc. Sometimes a single CAS number is assigned to a whole separate class: the group of alcohol dehydrogenases has the number 9031-72-5.

CAS number search

Currently, almost all chemical databases are searchable by CAS registration number. When using numbers CAS for database searches, it is useful to include the numbers of closely related compounds in the query as well.**

* Chemical Abstracts Service - A division of the American Chemical Society assigns this identifier to all substances ever mentioned in the literature.

** For example, to search for information about cocaine (CAS 50-36-2), you also need to search for cocaine hydrochloride (CAS 53-21-4), since this particular form of the compound is more common as a drug.

CAS registry number(aka CAS number, CAS RN, CAS#) - a unique numerical identifier of chemical compounds, polymers, biological sequences of nucleotides or amino acids, mixtures and alloys included in the Chemical Abstracts Service registry. The term does not have an unambiguous translation into Russian.

The CAS number is written as three groups of Arabic numerals separated by hyphens.

Chemical abstract service Chemical Abstracts Service) - a division of the American Chemical Society assigns this identifier to all substances ever mentioned in the literature. The unique identifier is designed to make it easier to find references in the literature by eliminating the problem of a possible different name for the same one. Today, almost all chemical databases are searchable by CAS registration number.

CAS maintains and sells a database of chemicals, the CAS registry. CAS regisry). As of 2012, the registry contains more than 64 million substances, with approximately 15,000 new ones being added daily.

Is the most authoritative collection of disclosed chemical substance information.

CAS REGISTRY covers substances identified from the scientific literature from 1957 to the present, with additional substances going back to the early 1900s.

CAS REGISTRY is updated daily with thousands of new substances.

What is a CAS Registry Number (CAS RN)?

Each CAS Registry Number ® (CAS RN ®) identifier:

Is a unique numeric identifier
Designates only one substance
Has no chemical significance
Is a link to a wealth of information about a specific chemical substance

What does a CAS Registry Number look like?

A CAS Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts.

How does CAS assign Registry Numbers?

A CAS Registry Number is assigned to a substance when it enters the CAS REGISTRY database. Numbers are assigned in sequential order to unique, new substances identified by CAS scientists for inclusion in the database.

What kinds of compounds does the CAS REGISTRY contain?

CAS REGISTRY contains a wide variety of substances, including the world"s largest collection of:

organic compounds
organic compounds
Metals
Alloys
Minerals
Coordination compounds
Organometallics
Elements
isotopes
nuclear particles
Proteins and nucleic acids
Polymers
Nonstructurable materials (UVCBs)

Why have CAS Registry Numbers become the world standard?

Since CAS Registry Numbers are not dependent upon any system of chemical nomenclature, they can:

Provide a reliable common link between the various nomenclature terms used to describe substances
Serve as an international resource for chemical substance identifiers used by scientists, industry and regulatory bodies

Why do regulatory agencies rely on CAS Registry Numbers?

Chemical compounds can be described in many different ways:

molecular formula
structure diagram
Systematic names
generic names
Proprietary or trade names
Trivial names

A CAS Registry Number, however, is unique and specific to only one substance regardless of how many other ways the substance can be described.

Governmental agencies have found CAS Registry Numbers ideal for keeping track of substances because

They are unique
They can be validated quickly and reliably
They are internationally recognized

Where can I find CAS REGISTRY Numbers?

Why do some substances in CAS REGISTRY have zero references? How can I learn more about these substances?

Records in REGISTRY represent substances indexed for the CAS databases (CA SM /CAplus SM , CASREACT ® , CHEMCATS ® , CHEMLIST ® , MARPAT ®) and other databases in products such as SciFinder ® and STN ® . Substances that come from sources other than literature or patent publications may not contain any references. CAS indexes these substances to support registration policies, chemical libraries, chemical catalogs, web sources, reaction databases and data collections not represented in STN.

To learn more about a substance in REGISTRY that does not have any literature or patent references consult the .

How can I obtain or request assignment of a CAS Registry Number?

Why is it important to come to CAS for Registry Numbers?

While printed publications may contain outdated information, the CAS REGISTRY database is updated daily providing your best source for the latest CAS Registry Number information.

CAS is the source and final authority for CAS Registry Numbers. Other resources may have associated an incorrect CAS Registry Number with a compound, and use of that incorrect CAS Registry Number in searches could lead you to irrelevant or inappropriate information.

What is the CAS RN Verified Partner Program?

A CAS Registry Number license is required anytime an organization will “publish” CAS Registry Numbers to the public or use them to support features of a platform that is publicly or commercially available. See the CAS Registry Number Verified Partner Program for more information.

What's happenedCAS?

CAS or Confirmation of Acceptance for Studies is the number that the sponsoring institution issues to the student upon enrollment. CAS number means a file created by an educational institution in the database of the immigration service, in which all the necessary information is recorded.

Not only the educational institution and the immigration service have access to the database. Anyone, having a number, can check what exactly is written in the file. Also, the educational institution issues all the necessary information to the applicant in printed form, which is why in Russian translation CAS often referred to as writing.

CAS number must be indicated by the applicant on the visa application form.

Valid CAS considered if:

the name and surname of the applicant indicated in the file correspond to his passport data;
it was issued no earlier than 6 months before the submission of documents to the embassy;
it was not canceled by the educational institution or the immigration service.

If the CAS is issued long before the submission of documents, but not earlier than 6 months, check if it is valid.

The CAS number cannot be used more than 1 time, if for some reason you were denied a visa, then you should contact the educational institution and ask for a new number.

Having a CAS number is not a single condition for obtaining visas: Tier 4 (General) student visa and Tier 4 (Child) student visa.

What documents do I need to submit to an educational institution to obtain a CAS number?

Attention, when opening a visa Student Visitor visa You do not need a CAS if you are going to study in courses, including language courses, for a period shorter than 11 months.

The list of documents required to obtain a CAS number is provided by the sponsoring institution and depends on the course and age of the applicant. Basically, this is a certificate, diplomas and certificates confirming the level of education received, extracts from diplomas, references from previous teachers.

All documents must be issued by official educational institutions indicating the full name of the applicant, the name of the educational institution, address and contacts.

Attention! The originals of all documents submitted to the educational institution must be included in the package of documents submitted to the embassy to open a visa. A certified English translation must also be added to the package.

If an applicant is applying for a course at NQF level 3 or higher and the admission decision is made based on an exam, test, or portfolio of work, then this does not need to be included in the package of supporting documents. The conditions under which the applicant was accepted for training will be listed in the CAS file.

In the case of a visa extension to continue studies in the next year, provided that the CAS is issued on the basis of academic success in the previous course, a written confirmation of these achievements does not need to be added.

If one of the conditions for admission to study is knowledge of the English language, and to confirm this, the applicant provided test results, then certificates confirming this must also be added to the package of accompanying documents. If the level of English knowledge was determined as a result of an interview with a representative of an educational institution, then no confirmation needs to be added to the package.

In some cases, in order to confirm the specified information, the immigration service may call the applicant for a personal interview. In case of non-appearance of the applicant without valid reasons or inconsistency of the heard information specified in the application, the visa will be denied.

The Emigration Service reserves the right to refuse to open a visa, even if all of the above documents are available. The reason for refusal is most often previous refusals or other emigration violations, not necessarily related to the UK.