Hazard class and division

UN Hazard Classes and Divisions — The hazard class of a material is indicated either by its class (or division) number, or its class name. For a placard corresponding to the primary hazard class of a material, the hazard class or division number must be displayed in the lower comer of the placard. The UN (United Nations) hazard classes are as follows ... 

The following is a list of chemicals and articles that are regulated by the U.S. Department of Transportation. The information has been obtained from 49 CFR, Parts 100-177 (.Hazardous Materials Table). The articles and chemicals are grouped by the hazard class and division (as defined in Chapter 1). 

Hazardous material means a substance or material, which has been determined by the Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. The term includes hazardous substances, hazardous wastes, marine pollutants, and elevated temperature materials as defined in this section, materials designated as hazardous under the provisions of Sec. 172.101 of this subchapter, and materials that meet the defining criteria for hazard classes and divisions in part 173 of this subchapter. US 171.8... 

Both primary and subsidiary hazard classes and divisions are combined numerically and not in order of precedence. For example, the many individual regulatory entries for chlorosilanes, each with the various primary and subsidiary hazards of corrosivity, flammability, and water-reactivity, become, Chlorosilanes, n.o.s., 3, 3.2, 4.3, 8. ... 

Shipping Papers DOT regulations require that a shipping order, bill of lading, manifest or other document used to initiate a shipment must describe any hazardous material offered for shipment. The description must include the name of the material, the DOT hazard class and division, the... 

The definition of a hazardous material is found in 49 CFR 171.8. The definition broadly includes hazardous substances, hazardous wastes, marine pollutants, and other materials designated as hazardous in the Hazardous materials table of 49 CFR 172.101, or meeting the defining criteria for hazard classes and divisions in 49 CFR 173. Hazardous substance is also defined in 49 CFR 171.8 to include any material listed in Appendix A to 49 CFR 172.101 that is present in a reportable quantity (RQ). 

One major difference between DOT and TC regulations was the Canadian use of the Class 2.4, corrosive gas classification. This classification was subsequently retained only for anhydrous ammonia. In 1998, TC discussed revisions to the regulations, and one proposal was the complete elimination of Class 2.4 with anhydrous ammonia to be classified as 2.2 (8). Another significant difference from DOT regulations is the Canadian requirement for pictorial placards and labels the use of words is virtually eliminated. See additional information on hazard classes and divisions in the section on Classification in this chapter. 

Hazard class and division Maximum kilograms (pounds) of HE Minimum intersite distance meters (feet) ... 

Fireworks that meet the requirements of BS7114 must also be included in a publication called the UK List of Classified and Authorised Explosives (LOCAL) and more recently by LOCAF (the UK List of Classified and Authorised Fireworks 1999). These lists originate from the Explosives Acts and relate to civilian rather than to military explosives. Thus, the 1994 edition of LOCAL contains articles ascribed to Kimbolton, Pains and Le Maitre. For example, included in the FIREWORKS columns, will be found STANDARD SET PIECE. For this particular entry, the United Nations Serial Number is given as 0336, the Hazard Code is 1.4G, the UK Class and Division is 7.2, while the Competent Authority (HSE) Reference is GB 72411. 

Hazard Class 1 - Division 1.4. Explosive Materials (These materials represent a small hazard with no mass explosion and no projection of fragments of appreciable size or range) ... 

Hazard Class 4 - Division 4.1. Flammable Solids (These include but are not limited to self-reactive materials which are materials that are liable to undergo at normal or elevated temperatures a strong exothermic decomposition caused by excessively high handling temperatures or by contaminattion,, and readily combustible materials which may cause a fire through friction) ... 

Hazard Class 4 - Division 4.2. Spontaneously Combustible Materials (These include pyrophoric materials and self-heating materials) ... 

An example of a two-zone concept for areas hazardous due to combustible substances is given in Table 2.2. It shows the traditional classification (in the USA and Canada) into classes and divisions according to the probability of forming an explosive atmosphere. 

Hazard category means the division of criteria within each hazard class, e.g. oral acute toxicity includes five hazard categories and flammable liquids includes four hazard categories. These categories compare hazard severity within a hazard class and should not be taken as a comparison of hazard categories more generally ... 

Regulatory entries differing only by hazard class or division are combined into a single entry in the Glossary. For example, the five individual regulatory entries for Fireworks representing divisions I.IG, 1.2G, 1.3G, 1.4G, and 1.4S become, Fireworks, I.IG, 1.2G, 1.3G, 1.4G, 1.4S. ... 

Hazardous Material Description Enter the proper shipping name, technical or trade name, hazard class or division, ID number, packing group, and amount of material released. All of this information, except the amount of material released, can be found on the shipping papers that accompany the shipment, 172.202. When indicating the amount of material released, include units of measurements (examples 115 gallons, 69 tons). 

Definition and Recognition The U.S. Department of Transportation (DOT) defines which materials are hazardous. The agency organizes the materials into classes and divisions. Table 14-2 lists the classes and divisions for hazard materials. DOT works with other agencies to maintain a fist of several thousand hazardous materials. The Pipehne and Hazardous Materials Administration publishes the fist in 49 CFR 172.101. The table includes material names, classes and divisions, labeling and packaging information, quantity limitations by transportation mode, and other information. DOT updates the list regularly. 

Sym- bols Hazardous material descriptions and proper tipping names Hazard class or Division Identi- fication numbers PC Labe codes Special provisions Excep- tions Non bulk Bulk Passenger aircrafl/rail Cargo aircraft only Loca- tion Other... 

Item 9. U.S. DOT Description (Including Proper Shipping Name, Hazard Class or Division, Identification Number, and Packing Group)... 

The hazardous nature of the cuea in which the equipment is installed. Table 3-8 outlines the NEC method for determining the Group, Class, and Division of a hazardous [Pg.16]

In addition to class and division of hazard, electrical hazards are further defined in each segment by group and designated by a letter such as A, B, etc. 

The Hazardous Materials Classes and Divisions listed below correspond to those listed in 49 CFR 173.2. (Short descriptions are provided. For more information see the Hazardous Materials guide at http //vwvw.fmcsa.dot.gov/hm-comply.)... 

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