Hazard Considerations.

5. Class V describes formulations that do not sustain combustion and present no reactivity

hazard.

B. The organic peroxides that fall under NFPA classes I, II, and III are required to be labeled

with a DOT "ORGANIC PEROXIDE" label (UN Class 5.2) for transportation purposes, which

also facilitates directing them to type P storage. Classes IV and V may or may not be identified

with the DOT "ORGANIC PEROXIDE" label.

C. Hazard Considerations.

1. Class I organic peroxide formulations present a hazard through easily initiated, rapid,

explosive decomposition. Class I may include formulations that are relatively safe only under

closely controlled temperatures. Excessively high or low temperatures may increase the potential

for severe explosive decomposition.

2. Class II organic peroxide formulations present a severe fire hazard similar to that presented

by NFPA class I flammable liquids; however, the decomposition is not as rapid, violent, or

complete as that produced by class I formulations. As with class I formulations, this class may

include formulations that are relatively safe under controlled temperatures or when diluted.

3. Class III organic peroxide formulations present a fire hazard similar to NFPA class II

combustible liquids. They are characterized by rapid burning and high heat liberation, due to

decomposition.

4. All organic peroxide formulations are incompatible with strong acids, strong alkalis, strong

oxidizers, acetone, transition metal salts, promoters, and reducing agents.

D. Basic Requirements. Detached organic peroxide storage areas within general purpose

warehouses modified for the storage of organic peroxides should include the protective features

for hazardous materials storage identified in the reference cited in paragraph 4.7 with additional

consideration given to:

1. All storage areas containing organic peroxide formulations should be conspicuously

identified by the words "ORGANIC PEROXIDE" (SF 443 or DOT placards are acceptable) and

by class, and if more than one class is stored in the same area, then it should be marked for the

most severe class present.

2. Packages containing organic peroxides requiring temperature control should be marked

with the recommended storage temperature range, and they should be stored in an environment

within that range (i.e., refrigerated).

E. Applicable HCCs. The following HCC should be stored in storage type P:

1. P1, Peroxide, Organic, DOT regulated, NFPA classes I, II, and III.

2. P2, Peroxide, Organic, Low Risk, NFPA classes IV and V.

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