Negligible hazard, definition

Benzoyl peroxide as a pure solid is classified as a deflagration hazard. When it is a solid containing about 30% water it is an intermediate fire hazard. As a paste (50% peroxide) it is a low fire or negligible hazard. See reference 18 for a definition of hazard classifications. Benzoyl peroxide containing 50% water will be purchased. It should be stored in a separate cool area, since all peroxides have short half-lives. 

Most industries approach this step in the same way. However, how they differentiate among catastrophic, critical, minor, and negligible hazards may vary. You will need to modify the definitions to fit the particular problem. What is important is that these definitions are determined before work begins. A rule-of-thumb definition for each is the following ... 

Allowing for exemption of waste materials that contain sufficiently small amounts of hazardous substances is a potentially important means of balancing the resources required to manage waste and the benefits in health risks averted. As a consequence of the discussion in Section 5.1, it is desirable that the definition of waste that can be exempted and, thus, managed as if it were nonhazardous should be risk-based. Furthermore, waste should be exempted based on the consideration that the associated risks should not exceed levels generally regarded as negligible. 

Given the qualitative definitions of the three waste classes, the boundaries of the waste classes would be quantified based on explicit descriptions of how the definitions are related to risk. The boundaries would be expressed in terms of limits on amounts (concentrations) of individual hazardous substances, with specified rules for how to classify waste that contains mixtures of hazardous substances, such as the sum-of-fractions rule for mixtures of substances that induce stochastic effects. Specifically, waste would be classified as exempt if the risk that arises from disposal in a municipal/industrial landfill for nonhazardous waste does not exceed negligible (de minimis) levels. Use of a negligible risk to quantify limits on concentrations of hazardous substances in exempt waste is appropriate because the waste would be managed in all respects as if it were nonhazardous. Nonexempt waste would be classified as low-hazard if the risk that arises from disposal in a dedicated near-surface facility for hazardous wastes does not exceed acceptable (barely tolerable) levels. An essential condition of the definitions of exempt and low-hazard waste is that an acceptable (barely tolerable) risk must be substantially greater than a negligible risk. Waste would be classified as high-hazard if it would pose an unacceptable (de manifestis) risk when placed in a dedicated near-surface facility for hazardous wastes. 

In the AOP 52 for the calculation of the SSCI it is necessary to know the severity of a hazard. It is categorized in four categories catastrophic, critical, marginal and negligible. These categories are not explicitly defined in the AOP 52 so we guess that these terms can be defined by the user depending on the application, e.g. in the definition of the ALARP approach. This leaves room for interpretations. This holds also true to a lesser extent for the concept of software autonomy of the AOP 52. 

Definition Oil expressed from rice bran, Oryza sativa Properties Golden yel. oil misc. with hexane and other fat soivs. negligible sol. in water dens. 0.916-0.921 vapor pressure very low cloud pt. < -7 C acid no. < 2 iodine no. 92-115 sapon. no. 180-190 ref. index 1.470-1.473 Hazardous Decomp. Prods. COjfrom combustion Uses Soap raw material hydrogenated shortening ingred. edible oil in foods and pharmaceuticals skin conditioner, solvent, emollient for cosmetics pharmaceuticals emollient ointment solvent in food-pi, adhesives defoamer in food-contact paper coatings, paper/paperboard for fiber finishing for resin-bonded filters for food contact in food-contact textiles... 

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