What is a CAS number in chemistry. CAS registration number

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casper Registration Number, Casey Registration Number "S GENERAL STORE
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 registry Chemical Abstracts Service. The term does not have an unambiguous translation into Russian.

The CAS number is recorded in the form of three groups of Arabic numbers separated by defisis.

Chemical Abstracts Service (English Chemical Abstracts Service) - A division of American chemical society assigns this identifier to all substances ever mentioned in the literature. A unique identifier is designed for greater convenience of finding references in literature due to the elimination of the problem of the possible different name of the same. Present practically, all chemical databases have a search by CAS registration number.

Cas actually supports and sells the chemical database, the CAS registry (eng. 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 system registration numbers
5 cm. Also on encodings of substances in databases
6 Notes
7 Links

Format

The CAS registration number is a sequence of numbers, separated by the signs of a hyphen into three sections; The first part may contain up to 7 digits, the second contains two digits, the third consists of one digit and performs the function of the test symbol. The rooms are assigned in an increasing order and do not have a predetermined value. The checksum is calculated by the addition of the last digit number multiplied by 1, the second to the right figures multiplied by 2, the third, multiplied by three and so on to the first left of the digit, converted by calculating the balance from dividing by 10. For example, the CAS registration number 7732 -18-5. The checksum is calculated as: 8 × 1 + 1 × 2 + 2 × 3 + 3 × 4 + 7 × 5 + 7 × 6 \u003d 105; 105 MOD 10 \u003d 5.

Isomers, enzymes, mixtures

Separate isomers of molecules also receive their own CAS number. For example, D-glucose has a number 50-99-7, L-glucose is denoted by 921-60-8; α-D-glucose - 26655-34-5, etc.

Sometimes the only CAS number is prescribed to a whole separate class: the group of alcohol dehydrogenase has the number 9031-72-5.

An example of which the number is defined for the mixture is the mustard oil (8007-40-7) - in this number it can be immediately understood that it is understood that there is no fatty mustard oil, namely natural essential oil of mustard - consisting, however, almost from pure allyliamicotic - CAS 57-06-7.

Search

When using CAS numbers to search for databases, the request can also be included in the request. For example, to search for cocaine information (CAS 50-36-2), it is necessary to search for both cocaine hydrochloride (CAS 53-21-4), since it is more common to use that this form of the connection is more common as a narcotic agent.

Criticization of the registration numbers

"Condemned by last years CAS monopoly on the provision of a paid service for assigning a sequence number that does not carry any chemical information, in many cases it makes it difficult to use it as a code / pointer to address information "

Notes

American Chemical Society. CAS REGISTRY AND CAS REGISTRY NUMBER FAQS (English). Checked on May 2, 2014.
N. N. Afonina et al. Development of the Bank of Information Resources of Vinity in Chemistry and Chemical Technology: from structural data to material chemistry and technology

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 registry Chemical Abstracts Service. The term does not have an unambiguous translation into Russian.

The CAS number is recorded in the form of three groups of Arabic numbers separated by defisis.

Chemical Abstract Service (English. Chemical Abstracts Service.) - The division of the American Chemical Society assigns this identifier to all substances ever mentioned in the literature. A unique identifier is designed for greater convenience of finding references in literature due to the elimination of the problem of the possible different name of the same. Today, almost all chemical databases have a search on the CAS registration number.

Cas actually supports and sells a chemical database, the CAS registry (eng. Cas Regisry.). As of 2012, this registry contains more than 64 million substances and approximately 15 thousand new ones are added daily.

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 registry Chemical Abstracts Service. * A unique identifier is designed for greater convenience of finding references in literature due to the elimination of the problem of the possible different name of the same.

The CAS registration number is a sequence of numbers, separated by the signs of a hyphen into three sections; The first part may contain up to 7 digits, the second contains two digits, the third consists of one digit and performs the function of the test symbol. The rooms are assigned in an increasing order and do not have a predetermined value. The checksum is calculated by the addition of the last digit number multiplied by 1, the second to the right figures multiplied by 2, the third, multiplied by three and so on to the first left of the digit, converted by calculating the balance from dividing by 10. For example, the CAS registration number 7732 -18- 5 . The checksum is calculated as: 8 × 1 + 1 × 2 + 2 × 3 + 3 × 4 + 7 × 5 + 7 × 6 \u003d 105; 105 MOD 10 \u003d 5.

The CAS number is recorded in the form of three groups of Arab numbers separated by hyphens.

In the case of independent filling of the form of information about the composition of products, special attention is paid to the selection of CAS numbers. In fact, it is such a unique number that is assigned to an element, mixture, in some cases a whole separate class and is necessary to clarify the component. For example, take the oil. Oil is creamy, sunflower, engine, and each of them has its own unique CAS identifier. Also, when developing PB by CAS number, the specificity of the hazard class is determined.

Isomers, enzymes, mixtures

Separate isomers of molecules also receive their own CAS number. For example, D-glucose has a number 50-99-7, L-glucose is denoted by 921-60-8; α-D-glucose - 26655-34-5, etc., D. Side is the only CAS number is prescribed to a whole separate class: the group of alcohol dehydrogenase has the number 9031-72-5.

Search for Cas rooms

Currently, almost all chemical databases have a search by the CAS registration number. When using numbers Cas. To search for databases, the request is also useful to include close-friendly connections. **

* Chemical Abstracts Service - Chemical Referaval Service - The 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), it is necessary to search for and cocaine hydrochloride (CAS 53-21-4), since the use of precisely this form of connection is more common as a narcotic agent.

WhatCas.?

Cas. Or Confirmation of Acceptance for Studies (confirmation of enrollment for training) is a number that the sponsor education institution gives a student when enrolling on training. Cas Indicates the file created by the educational institution in the emigration service database in which all the necessary information is recorded.

Not only educational institution and emigration service have access to the database. Everyone, having a room, can check what is recorded in the file. Also, all the necessary information, the educational institution issues the applicant in print, which is why in Russian translation Cas. often called writing.

Cas Must be specified by the applicant in the questionnaire for visa.

Valid Cas. Considered if:

the name and surname of the applicant specified in the file correspond to its passport data;
it was not previously issued than 6 months before submitting documents to the Embassy;
it was not canceled by an educational institution or emigration service.

If Cas is issued long before filing documents, but not earlier than for 6 months, make sure whether 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 an educational institution and ask the new number.

The presence of the CAS number is not a single condition for obtaining visas: Tier 4 (General) Student Visa and Tier 4 (Child) Student Visa.

What documents need to provide an educational institution to get the CAS number?

Attention, when opening a visa Student Visitor Visa You do not need Cas if you are going to learn on courses, including language, term shorter 11 months.

The list of documents required to get the CAS number is provided by a sponsor school and depends on the course and age of the applicant. Basically, this is a certificate, diplomas and certificates confirming the level of education obtained, extracting from diplomas, characteristic of previous teachers.

All documents must be issued by official educational institutions with an indication of the full name of the applicant, the names of the educational institution, addresses and contacts.

Attention! The originals of all documents provided to the educational institution should be included in the package of documents submitted to the Embassy to open a visa. Also in the package must be added a certified translation into English.

If the applicant submits documents to study at the level of NQF Level 3 or higher, and the decision on enrollment is made on the basis of the exam, test or the provision of portfolio of work, then in this case, it is not necessary to include this in the package of accompanying documents. The conditions on which the applicant accepted on training will be listed in the CAS file.

In case of prolongation of a visa to continue learning in the next year, provided that CAS is issued on the basis of academic success in the previous course, no written confirmation of these success is needed.

If one of the conditions for enrollment for training is knowledge in EnglishAnd to confirm this, the applicant provided the test results, then certificates confirming this should 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 the educational institution, then no confirmation add to the package.

In some cases, to confirm the specified information, the emigration service can call the applicant to a personal interview. If the applicant's failure to appear without valid reasons or in the 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 there are all the above documents. The reason for the refusal is most often the previous failures or other emigration violations, not necessarily related to the UK.

Is The Most Authoritative Collection of Disclosed Chemical Substance Information.

Cas Registry Covers Substances Identified From The Scientific Literature from 1900s 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 OFF INFORMATION APOUT 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, CASRACT ®, 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.