horizontal plane for indication of compass deflection. When the maximum compass deflection observed is two
degrees or less the material is not considered to be magnetic. When the deflection of an item exceeds 2 degrees,
the item is magnetic and shielding must be applied until the maximum deflection is not more than 2 degrees.
N1 - Not regulated as Hazardous. Any material, which does not meet the definition of any other HCC, is not
regulated as hazardous by any regulatory organization, and through technical evaluation is generally regarded as
nonhazardous for storage. Supporting documentation regarding the lack of storage hazards must be available
through documents such as the MSDS, product labels, manufacturer's literature, and the advisory sources listed in
known listings of hazardous materials, while not conclusive of the lack of storage hazards, may be considered in
the decision process and relies heavily on the professional judgment and experience of the evaluator. Note:
Hazards associated with the actual use of the item should be made by qualified Industrial Hygiene Personnel.
P1 - Peroxide, Organic, DOT Regulated. A product classed as a UN Class 5.2 (Organic Peroxide) by the US
DOT as defined in 49 CFR 173.128 and listed in the Organic Peroxides Table in 49 CFR 173.225 and is defined
in NFPA Code 43B as NFPA Classes I, II, or III organic peroxides based on information provided by the supplier
or manufacturer.
NFPA Class I organic peroxides present a deflagration hazard through easily ignited, rapid explosive
decomposition. NFPA Class I includes some formulations that are relatively safe only under closely controlled
temperatures. Either excessively high or low temperatures may increase the potential for severe explosive
decomposition.
NFPA Class II organic peroxides present a severe fire hazard similar to NFPA Class I flammable liquids. The
decomposition is not as rapid, violent, or complete as that produced by Class I formulations. As with Class I
formulations, this class includes some formulations that are relatively safe when under controlled temperatures or
when diluted.
NFPA Class III organic peroxides present a fire hazard similar to NFPA Class II combustible liquids. They are
characterized by rapid burning and high heat liberation, due to decomposition.
Typical Class I, II, and III organic peroxides are listed in Volume 2, Appendix 43B of the National Fire Protection
Association (NFPA) National Fire Codes Subscription Service.
P2 - Peroxide, Organic, Low Risk. A product that is an Organic Peroxide that is not regulated by the US DOT
and meets the definition of NFPA Code 43B, Class IV organic peroxides that burn as ordinary combustibles and
present minimal reactivity hazard. Class IV formulations present fire hazards that are easily controlled.
Reactivity has little effect on fire intensity. Also included are Organic Peroxides that are not regulated by the US
DOT and meet the definition of NFPA Code 43B, Class V organic peroxides. Class V formulations do not
themselves burn and do not present a decomposition hazard. This definition includes Organic Peroxides
regulated by the FDA. Typical Class IV and V organic peroxides are listed in Volume 2, Appendix 43B of the
NFPA National Fire Codes Subscription Service.
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