cas号是什么
CAS号（CAS Registry Number或称CAS Number, CAS Rn, CAS
#），又称CAS登录号，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。
http://baike.baidu.com/link?url=2-7UnD3po23WywcouxZAfiE1g7qKs7iZXWVl8LnAgBq5KNDw1Ex7WIFFsOaUcJlqRlsby0OaHS_bd9k0l2wREK
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 (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
我也不是很清楚，cas号和有没有毒没关系吧。我的理解就是，可以用号查到对应的化学品
附，百度到的查询网址
查到了化学品，就可以再查资料确定是那种危险品了
完毕，望采纳，谢谢
重点监管的危险化学品名录
序号 化学品名称 别名 CAS号
1 氯 液氯、氯气 7782-50-5
2 氨 液氨、氨气 7664-41-7
3 液化石油气 68476-85-7
4 硫化氢 7783-06-4
5 甲烷、天然气 74-82-8（甲烷）
6 原油
7 汽油（含甲醇汽油、乙醇汽油）、石脑油 8006-61-9（汽油）
8 氢 氢气 1333-74-0
9 苯（含粗苯） 71-43-2
10 碳酰氯 光气 75-44-5
11 二氧化硫 7446-09-5
12 一氧化碳 630-08-0
13 甲醇 木醇、木精 67-56-1
14 丙烯腈 氰基乙烯、乙烯基氰 107-13-1
15 环氧乙烷 氧化乙烯 75-21-8
16 乙炔 电石气 74-86-2
序号 化学品名称 别名 CAS号
17 氟化氢、氢氟酸 7664-39-3
18 氯乙烯 75-01-4
19 甲苯 甲基苯、苯基甲烷 108-88-3
20 氰化氢、氢氰酸 74-90-8
21 乙烯 74-85-1
22 三氯化磷 7719-12-2
23 硝基苯 98-95-3
24 苯乙烯 100-42-5
25 环氧丙烷 75-56-9
26 一氯甲烷 74-87-3
27 1，3-丁二烯 106-99-0
28 硫酸二甲酯 77-78-1
29 氰化钠 143-33-9
30 1-丙烯、丙烯 115-07-1
31 苯胺 62-53-3
32 甲醚 115-10-6
33 丙烯醛、2-丙烯醛 107-02-8
34 氯苯 108-90-7
35 乙酸乙烯酯 108-05-4
36 二甲胺 124-40-3
序号 化学品名称 别名 CAS号
37 苯酚 石炭酸 108-95-2
38 四氯化钛 7550-45-0
39 甲苯二异氰酸酯 TDI 584-84-9
40 过氧乙酸 过乙酸、过醋酸 79-21-0
41 六氯环戊二烯 77-47-4
42 二硫化碳 75-15-0
43 乙烷 74-84-0
44 环氧氯丙烷 3-氯-1,2-环氧丙烷 106-89-8
45 丙酮氰醇 2-甲基-2-羟基丙腈 75-86-5
46 磷化氢 膦 7803-51-2
47 氯甲基甲醚 107-30-2
48 三氟化硼 7637-07-2
49 烯丙胺 3-氨基丙烯 107-11-9
50 异氰酸甲酯 甲基异氰酸酯 624-83-9
51 甲基叔丁基醚 1634-04-4
52 乙酸乙酯 141-78-6
53 丙烯酸 79-10-7
54 硝酸铵 6484-52-2
55 三氧化硫 硫酸酐 7446-11-9
56 三氯甲烷 氯仿 67-66-3
序号 化学品名称 别名 CAS号
57 甲基肼 60-34-4
58 一甲胺 74-89-5
59 乙醛 75-07-0
60 氯甲酸三氯甲酯 双光气 503-38-8
第二批重点监管的危险化学品名录
序号 化学品品名 CAS号
1 氯酸钠 7775-9-9
2 氯酸钾 3811-4-9
3 过氧化甲乙酮 1338-23-4
4 过氧化(二)苯甲酰 94-36-0
5 硝化纤维素 9004-70-0
6 硝酸胍 506-93-4
7 高氯酸铵 7790-98-9
8 过氧化苯甲酸叔丁酯 614-45-9
9 N,N'-二亚硝基五亚甲基四胺 101-25-7
10 硝基胍 556-88-7
11 2,2'-偶氮二异丁腈 78-67-1
12 2,2'-偶氮-二- (2,4-二甲基戊腈)
（即偶氮二异庚腈） 4419-11-8
13 硝化甘油 55-63-0
14 乙醚 60-29-7
