Hazard Classification Class categories

After identifying hazards and their resultant adverse effects, the analyst will rate each according to the Hazard Classification class, which could be one of four categories ... 

The results of the effects testing will be used to place the material in a hazard category based on NATO-UN classification scheme and when combined with the sensitivij y data will give the material an overall hazard classification. For example, a material which is foiind to be an intense fire hazard (consequence 1.3) and sensitive (Category B) to initiation by rubbing friction would be placed in class 1.3B. 

Once the hazard classification is completed, the chemical s hazard class and category will dictate the pictogram, signal word(s), hazard statement(s), and precautionary state-ment(s) that must be used on the label, and which must appear on the SDS. 

Under the current Hazard Communication Standard (HCS), the label preparer must provide the identity of the chemical, and the appropriate hazard warnings. This may be done in a variety of ways, and the method to convey the information is left to the preparer. Under the revised HCS, once the hazard classification is completed, the standard specifies what information is to be provided for each hazard class and category. Labels will require the following elements ... 

Management and disposal of the wide variety of hazardous wastes has been aided by the development of waste classification systems. The term waste classification refers to broadly defined waste categories related, for example, to properties of waste materials, potential risks to human health that arise from waste management or disposal, or the source of the waste. Ideally, hazardous wastes in the same class should pose similar risks to human health and, thus, require similar approaches to safe management and disposal. 

The states of Washington and California have considered a classification of hazardous chemical waste based on risk and have developed a category of extremely hazardous waste (California, 1999 Mehlhaff et al., 1979 NAS/NRC, 1999b). However, the requirements for treatment and disposal of extremely hazardous waste differ little from those applied to other hazardous waste. Thus, the designation of a class of extremely hazardous waste based on relative hazard has had little effect on waste management and disposal. 

One objective of the GHS is for it to be simple and transparent with a clear distinction between classes and categories in order to allow for self classification as far as possible. For many hazard classes the criteria are semi-quantitative or qualitative and expert judgement is required to interpret the data for classification purposes. Furthermore, for some hazard classes (e.g. eye irritation, explosives or self-reactive substances) a decision tree approach is provided to enhance ease of use. 

The tables in the individual Chapters for each hazard class detail the label elements (symbol, signal word, hazard statement) that have been assigned to each of the hazard categories of the GHS. Hazard categories reflect the harmonized classification criteria. A summary of the allocation of label elements is provided in Annex 1. Special arrangements to take into account the information needs of different target audiences are further described in 1.4.10.5.4. 

Unlike the individual legislative demands required for the pre-marketing classification and labehng of materials, today the transport of hazardous goods is the subject of international harmony. Moreover, because of the dominant role of road transport, the basic rules of the AD-regulations for different classes and categories are described in detail. 

Classification as an HNOC does not mean the chemical poses no hazards - only that it does not fit into one of the established GHS hazard classes, or that it falls into a hazard category that OSHA has not adopted, such as Acute Toxicity - Category 5. 

Hazard not otherwise classified (HNOC) refers to a physical or health effect identified through the classification process that does not meet the GHS criteria for the physical and health hazard classes, or which falls below the cut-off value/concentration limit of the hazard class or is under a GHS hazard category that has not been adopted by OSHA (e.g., acute toxicity category 5). 

Depending on the Class, there can be up to 5 Categories. As a result of the GHS/Hazcom revisions in 2012, all of this information is standardized, both in the evaluation and classification method, as well as in label elements, SDS elements, and hazard statements. In other words, if a chemical is determined to be a Category 1 fiammable gas then there is a predefined list of pictograms, label elements, SDS wording, etc., that manufacturers or importers must utilize. 

The definitions of hazard will change to provide specific criteria for classification of health and physical hazards as well as classification of mixtures. These specific criteria will help to ensure that evaluations of hazardous effects remain consistent across manufacturers. This will result in more accurate labels and SDSs. Chemical manufacturers and importers must provide a label that includes a harmonized signal word, pictogram, and hazard statement for each hazard class and category. Precautionary statements must also be provided. Finally, the SDS will contain a specified 16-section format. 

What are four categories of hazardous substances based on chemical properties Which important class of hazardous substances does this classification scheme omit ... 

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