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
- Inorganic 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.
WhatCAS?
CAS or Confirmation of Acceptance for Studies is the number the sponsoring institution issues to the student upon enrollment. CAS number denotes a file created by the educational institution in the database of the emigration service, in which all the necessary information is recorded.
Not only the educational institution and the emigration service have access to the database. Anyone who wants to, 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 a letter.
CAS number must be indicated by the applicant in the visa application form.
Valid CAS considered if:
- the applicant's name and surname 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 has not been canceled by the educational institution or the emigration office.
If the CAS is issued long before the submission of documents, but not earlier than 6 months, make sure 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.
The presence of 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 provide to an educational institution in order 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 on courses, including language courses, for a period of less 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, these are a certificate, diplomas and certificates confirming the level of education received, extracts from diplomas, characteristics 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. Also a certified English translation must be added to the package.
If an applicant submits documents for training on a course at NQF level 3 or higher, and the decision to enroll him is made on the basis of an exam, test or the provision of a portfolio of works, then in this case it is not necessary to include this in the package of accompanying 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 studying in the next course, provided that the CAS was issued on the basis of academic success in the previous course, there is no need to add a written confirmation of these successes.
If one of the conditions for admission to training is knowledge of English language, and to confirm this the applicant has provided the test results, then certificates confirming this must also be added to the package of accompanying documents. If the level of knowledge of English was determined as a result of an interview with a representative of an educational institution, then you do not need to add any confirmations to the package.
In some cases, in order to confirm the specified information, the emigration service may call the applicant for a personal interview. If the applicant does not appear without good reason or if the information he heard specified in the application does not match, the visa will be refused.
The Emigration Service reserves the right to refuse to open a visa, even if all of the above documents are present. The reason for the refusal is most often due to previous refusals or other emigration violations, not necessarily related to the UK.
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casper registration number, casey "s general store registration number
CAS registry number(he is 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 Chemical Abstracts Service register. 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 more convenient to search for references in the literature by eliminating the problem of a possible different name for the same one. nowadays virtually all chemical databases are searchable by the CAS registration number.
CAS itself maintains and sells a database of chemicals, the CAS registry. As of May 2, 2014, this registry contains more than 100 million substances and approximately 15 thousand new ones are added daily.
- 1 Format
- 2 Isomers, enzymes, mixtures
- 3 Search
- 4 Criticism of the registration number system
- 5 See also about substance codings in databases
- 6 Notes
- 7 References
Format
The CAS registration number is a sequence of numbers, divided 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 check character. The numbers are assigned in ascending order and have no predefined 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 on the left, ending with a remainder after division by 10. For example, the CAS registration number for water is 7732 -18-5. The checksum is calculated as follows: 8 × 1 + 1 × 2 + 2 × 3 + 3 × 4 + 7 × 5 + 7 × 6 = 105; 105 mod 10 = 5.
Isomers, enzymes, mixtures
The individual isomers of the molecules 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 alcohol dehydrogenase group is 9031-72-5.
An example, when a number is determined for a mixture, is mustard oil (8007-40-7) - from this number you can immediately understand that it is not fatty mustard oil that is meant, but the natural essential oil of mustard - consisting, however, of almost pure allyl isothiocyanate - CAS 57-06-7.
Search
When using CAS numbers for database searches, it can be 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 need to look for cocaine hydrochloride (CAS 53-21-4), since the use of this particular form of the compound is more common as a drug.
Criticism of the registration number system
"The monopoly of CAS that has developed in recent years on the provision of a paid service for the assignment of a serial number that does not carry any chemical information, in many cases makes it difficult to use it as a code / pointer for accessing information"
See also about codings of substances in databases
- code CF (Commission on Enzymes)
- Pubchem
- SMILES (Simplified molecular input line entry specification)
- UN number
Notes (edit)
- American Chemical Society. CAS REGISTRY and CAS Registry Number FAQs. Retrieved May 2, 2014.
- NN Afonina et al. DEVELOPMENT OF THE DATA BANK OF INFORMATION RESOURCES OF THE VINITI ON CHEMISTRY AND CHEMICAL TECHNOLOGY: FROM STRUCTURAL DATA TO MATERIAL CHEMISTRY AND TECHNOLOGY
Links
- a description of the registry of the Chemical Abstracts Service (CAS).
There are many free resources available to find compound CAS numbers by name, formula, or structure.
- PubChem
- NIH ChemIDplus
- NIST Chemistry WebBook
- NCI / CADD Chemical Identifier Resolver
- NCI / CADD Database Browser
- Chemfinder
- Landolt-Börnstein Substance / Property Index
casey's general store registration number, cashnetusa registration number, casper registration number, cassandra registration number
CAS Registration Number Information About
CAS registry number(he is 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 more convenient to search for 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 numbers, divided 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 check character. The numbers are assigned in ascending order and have no predefined 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 on the left, ending with a remainder after division by 10. For example, the CAS registration number for water is 7732 -eighteen- 5 ... The checksum is calculated as follows: 8 × 1 + 1 × 2 + 2 × 3 + 3 × 4 + 7 × 5 + 7 × 6 = 105; 105 mod 10 = 5.
The CAS number is written as three groups of Arabic numerals separated by hyphens.
In the case of self-filling in the form of information on the composition of the product, special attention is paid 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 to a whole separate class and is necessary to clarify a component. For example, let's take butter. There are butter, sunflower, motor oil, and each of them has its own unique CAS identifier. Also, when developing an SD, the specificity of the hazard class is determined by the CAS number.
Isomers, enzymes, mixtures
The individual isomers of the molecules 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 number 9031-72-5.
An example, when a number is determined for a mixture, is mustard oil (8007-40-7) - from this number you can immediately understand that it is not fatty mustard oil that is meant, but the natural essential oil of mustard - consisting, however, of almost pure allyl isothiocyanate - CAS 57-06-7.
CAS Number Search
Nowadays 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 look for cocaine hydrochloride (CAS 53-21-4), since the use of this particular form of the compound is more common as a drug.
CAS registry number(he is 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 Chemical Abstracts Service register. 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 (eng. 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 more convenient to search for references in the literature by eliminating the problem of a possible different name for the same one. Today virtually all chemical databases are searchable by CAS registration number.
CAS itself maintains and sells a database of chemicals, the CAS registry (eng. CAS regisry). As of 2012, this register contains more than 64 million substances and about 15 thousand new ones are added every day.
