Health hazard classes acute toxicity

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). 

Hazard class means the nature of the physical, health or environmental hazard, e.g. flammable solid, carcinogen, oral acute toxicity ... 

C.2.4.7 In most cases, the precautionary statements are independent (e.g., the phrases for explosive hazards do not modify those related to certain health hazards, and products that are classified for both hazard classes shall bear appropriate precautionary statements for both). Where a chemical is classified for a number of hazards, and the precautionary statements are similar, the most stringent shall be included on the label (this will be applicable mainly to preventive measures). An order of precedence may be imposed by the chemical manufacturer, importer or responsible party in situations where phrases concern Response. Rapid action may be crucial. For example, if a chemical is carcinogenic and acutely toxic, rapid action may be crucial, and first aid measures for acute toxicity will take precedence over those for long-term effects. In addition, medical attention to delayed health effects may be required in cases of incidental exposure, even if not associated with immediate symptoms of intoxication. 

The Federal Office of Public Health (FOPH) classifies chemical substances in terms of acute oral toxicity in the rat, and other available data such as skin and/or inhalation toxicity, skin and eye irritation/corrosive effects, subacute/subchronic/chronic toxicity, carcinogenicity/mutagenicity/teratogenicity and human exposure. Substances are placed in one of 5 classes ranging from Category 1 (most hazardous) to Category 5 (least hazardous). 

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