4.5.3 Incompatible materials and flammable liquids shall not be stored
NFPA 432, 22.214.171.124
within 25 ft. of organic peroxide formulations in chemical storage
[NOTE: Organic peroxide formulations that are also classified
as flammable liquids may be stored with other organic peroxide
126.96.36.199 If a 25-foot separation cannot be maintained, then a 1-
NFPA 432, 188.8.131.52
hour, liquid-tight fire barrier shall be permitted.
4.5.4 Only closed containers shall be permitted in an organic peroxide
NFPA 432, 4.11.4
4.5.5 Fifty-five-gallon drums of organic peroxide formulations shall
NFPA 432, 4.11.6
not be stacked.
4.5.6 Storage temperatures in chemical storage areas shall be
NFPA 432, 4.4.1
maintained within the recommended storage temperature range
184.108.40.206 High and low temperature switches, as applicable, shall
NFPA 432, 4.4.2
be provided in addition to normal temperature controls.
These switches shall actuate an alarm to ensure prompt
220.127.116.11 Heating systems shall use low-pressure steam, hot water,
NFPA 432, 4.4.3
or indirectly heated air; cooling systems shall not use
direct expansion of a flammable gas.
18.104.22.168 Heating or cooling pipes and other heat transfer devices
NFPA 432, 4.4.4
shall not come into contact with organic peroxide
containers to cause their overheating or cooling.
Refrigerators used for storing organic peroxide formulations
NFPA 432, 4.5.2
shall be Class I, Group D, and Division I (i.e., "explosion-
proof", as defined in Article 500 of NFPA 70.
Unventilated, unrefrigerated storage cabinets used for the
NFPA 432, 4.5.3
storage of organic peroxides shall be considered Class I,
Division I as defined in Article 500 of NFPA 70.
Ventilated storage cabinets shall be considered Class I, Division
NFPA 432, 4.5.4
II as defined in Article 500 of NFPA 70. Ventilation must be a
minimum of 1 cubic foot/minute/square foot of floor area.
Attention should be used to ensure that organic peroxides stored in direct sunlight are not heated above allowed temperatures
by radiant heating.