CAS.NO是什么意思呀

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证一样，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！

希望对你有帮助！ 国内比较好的MSDS查询网站，我常用的 msdsdq 点 cn,msds大全网。

以chemicalbook为例，其中的具体步骤如下：

1、电脑浏览器百度搜索chemicalbook，选择图示链接跳转。

2、这个时候打开新的页面，需要根据实际情况输入相关信息进行搜索。

3、下一步如果没问题，就继续确定点击对应产品。

4、这样一来会得到CAS.NO的结果，即可达到目的了。

NO就是CAS编号，美国环境保护署

(EPA)

对各种主要的化学污染物质订立了许多的管理规章，每个化学物质都拥有一个

CAS

编号，并且有相对应的处理对策。

CAS就是Chemical

Abstracts

Service，是美国化学文摘登记号。

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8唯一的数字识别号码。

国内的： http://www.chemicalbook.com/ProductIndex.aspx

国外的： http://www.chemexper.com/

chemicbook一个有关化学信息非常好的搜索网站，只要知道中文名，英文名，分子式等基本信息就可查询，还可以查物质的结构性质和哪里可以订购，数据比较充分。

9003-35-4 酚醛树脂

67-56-1 甲醇

308069-56-9 芳纶纤维

至于聚酯纤维，我认为是没有CAS号的，并不是所有化合物都是有CAS号的，再说这是个聚合物，那也就是说它是以一系列同系物聚合度不同的组成的，很有可能没有CAS号

如:CAS号: 37640-57-6

分子式: C6H9N9O3

分子量: 255.19

氰尿酸三聚氰胺是一种无卤型阻燃剂，又叫三聚氰胺氰尿酸酯（简称MCA）

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 (e.g. acrylamide has UN2074), while sometimes groups of chemicals or products with similar properties receive a common UN number (e.g. 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 significantlysubstances 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 6.1 and the one of cigarette lighters is 2.1. 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 1.1: Substances and articles which have a mass explosion hazard

Division 1.2: Substances and articles which have a projection hazard but not a mass explosion hazard

Division 1.3: 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 1.4: Substances and articles which present no significant hazard

Division 1.5: Very insensitive substances which have a mass explosion hazard

Division 1.6: Extremely insensitive articles which do not have a mass explosion hazard

Class 2: Gases

Division 2.1: Flammable gases

Division 2.2: Non-flammable, non-toxic gases

Division 2.3: Toxic gases

Class 3: Flammable liquids

Class 4: Flammable solidssubstances liable to spontaneous combustionsubstances which, on contact with water, emit flammable gases

Division 4.1: Flammable solids, self-reactive substances and solid desensitised explosives

Division 4.2: Substances liable to spontaneous combustion

Division 4.3: Substances which in contact with water emit flammable gases

Class 5: Oxidizing substances and organic peroxides

Division 5.1: Oxidizing substances

Division 5.2: Organic peroxides

Class 6: Toxic and infectious substances

Division 6.1: Toxic substances

Division 6.2: Infectious substances

Class 7: Radioactive material

Class 8: Corrosive substances

Class 9: Miscellaneous dangerous substances and articles

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8唯一的数字识别号码。

MSDS (Material Safety Data Sheet)即化学品安全说明书，亦可译为化学品安全技术说明书或化学品安全数据说明书。是化学品生产商和进口商用来阐明化学品的理化特性（如PH值，闪点，易燃度，反应活性等）以及对使用者的健康（如致癌，致畸等）可能产生的危害的一份文件。

在Google上可以用CAS No.查到化学品的信息.