CAS的数据库

化学文摘社提供若干化学相关信息数据库，其中两个最基本的数据库是CAplus和Registry： CAplus包含世界范围内的化学期刊和其他科学期刊上的化学相关文章的文献目录检索信息以及摘要，超过2千7百万条文献和17亿引用记录。 Registry包含3千4百万种无机及有机化学物质的15亿余条属性数据、1千4百万条反应以及5千9百万DNA序列。 化学物质属性信息来自化学文摘社，使用CAS号对物质进行检索。 DNA序列信息由化学文摘社和美国国家生物技术信息中心的GenBank共同提供。

CAS NO是美国化学文摘服务社(Chemical Abstracts Service ,CAS)为化学物质制订的登记号,该号是检索有多个名称的化学物质信息的重要工具是某种物质（化合物、高分子材料、生物序列（Biological sequences）、混合物或合金的唯一的数字识别号码

CAS:是商品的cas编码，cas编码中文全称为“化学物质登录号”，由一组数字组成。就像我们都有自己唯一的身份z一样，每一种已经发现的化合物都有自己唯一对应的编号;

CAS NO= cas number，中文就是 CAS号码 的意识！

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1。 CAS no (number): 不是危险品而已， 而是所有的化学品都有的一个编号， 便于数据库的查找。

CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys They are also referred to as CAS numbers or CAS RNs

Chemical Abstracts Service (CAS), a division of the American Chemical Society, assigns these identifiers to every chemical that has been described in the literature The intention is to make database searches more convenient, as chemicals often have many names Almost all molecule databases today allow searching by CAS number

As of Nov 2, 2005, there were 26,901,696 substances in the CAS registry — the current number is published here About 4,000 new numbers are added each day

CAS registry number is separated by hyphens into three parts, the first consisting of up to 6 digits, the second consisting of two digits, and the third consisting of a single digit serving as a check digit

2。 UN no 才是危险品特有的。 运输都要有这号码。

UN numbers or UN IDs are four-digit numbers that identify dangerous goods hazardous substances and articles (such as explosives, flammable liquids, toxic substances, etc) in the framework of international transport Some hazardous substances have their own UN numbers (eg acrylamide has UN2074), while sometimes groups of chemicals or products with similar properties receive a common UN number (eg flammable liquid, not otherwise specified, have UN1993) A chemical in its solid state may receive a different UN number than the liquid phase if their hazardous properties differ significantly; substances with different levels of purity may also receive different UN numbers

UN numbers range from UN0001 to about UN3500 and are assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods They are published as part of their Recommendations on the Transport of Dangerous Goods, also known as the Orange Book These recommendations are adopted by the regulatory organization responsible for the different modes of transport

NA numbers (North America), also known as DOT numbers are issued by the United States Department of Transportation and are identical to UN numbers, except that some substances without a UN number may have an NA number These additional NA numbers use the range NA8000 - NA9999

Associated with each UN number is a hazard identifier, which encodes the general hazard class and subdivision (and, in the case of explosives, their compatibility group) For instance, the hazard identifier of acrylamide is 61 and the one of cigarette lighters is 21 If a substances poses several dangers, then subsidiary risk identifiers may be specified It is not possible to deduce the hazard class(es) of a substance from its UN number: they have to be looked up in a table

The hazard classes and their divisions are:

Class 1: Explosives

Division 11: Substances and articles which have a mass explosion hazard

Division 12: Substances and articles which have a projection hazard but not a mass explosion hazard

Division 13: Substances and articles which have a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard

Division 14: Substances and articles which present no significant hazard

Division 15: Very insensitive substances which have a mass explosion hazard

Division 16: Extremely insensitive articles which do not have a mass explosion hazard

Class 2: Gases

Division 21: Flammable gases

Division 22: Non-flammable, non-toxic gases

Division 23: Toxic gases

Class 3: Flammable liquids

Class 4: Flammable solids; substances liable to spontaneous combustion; substances which, on contact with water, emit flammable gases

Division 41: Flammable solids, self-reactive substances and solid desensitised explosives

Division 42: Substances liable to spontaneous combustion

Division 43: Substances which in contact with water emit flammable gases

Class 5: Oxidizing substances and organic peroxides

Division 51: Oxidizing substances

Division 52: Organic peroxides

Class 6: Toxic and infectious substances

Division 61: Toxic substances

Division 62: Infectious substances

Class 7: Radioactive material

Class 8: Corrosive substances

Class 9: Miscellaneous dangerous substances and articles

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