SECTION 307 HIGH-HAZARD GROUP
H
[F] 307.1 High-hazard Group
H. High-hazard Group H occupancy includes, among others,
the use of a building or structure, or a portion thereof,
that involves the manufacturing, processing, generation or
storage of materials that constitute a physical or health
hazard in quantities in excess of those allowed in control
areas constructed and located as required in Section
414. Hazardous uses are classified in Groups H-1, H-2,
H-3, H-4 and H-5 and shall be in accordance with this section,
the requirements of Section 415 and
the International Fire Code.
Exceptions: The following
shall not be classified in Group H, but shall be classified
in the occupancy that they most nearly resemble:
1. Buildings and structures
that contain not more than the maximum allowable quantities
per control area of hazardous materials as shown in Tables
307.1(1) and 307.1 (2),
provided that such buildings are maintained in accordance
with the International Fire Code.
2. Buildings utilizing control
areas in accordance with Section 414.2
that contain not more than the maximum allowable quantities
per control area of hazardous materials as shown in Tables
307.1(1) and 307.1(2).
3. Buildings and structures
occupied for the application of flammable finishes, provided
that such buildings or areas conform to the requirements
of Section 416 and the International
Fire Code.
4. Wholesale and retail sales
and storage of flammable and combustible liquids in mercantile
occupancies conforming to the International Fire Code.
5. Closed piping containing
flammable or combustible liquids or gases utilized for
the operation of machinery or equipment.
6. Cleaning establishments
that utilize combustible liquid solvents having a flash
point of 140°F (60°C) or higher in closed systems employing
equipment listed by an approved testing agency, provided
that this occupancy is separated from all other areas
of the building by 1-hour fire barriers or 1-hour horizontal
assemblies or both.
7. Cleaning establishments
that utilize a liquid solvent having a flash point at
or above 200°F (93°C).
8. Liquor stores and distributors
without bulk storage.
9. Refrigeration systems.
10. The storage or utilization
of materials for agricultural purposes on the premises.
11. Stationary batteries
utilized for facility emergency power, uninterrupted power
supply or telecommunication facilities, provided that
the batteries are provided with safety venting caps and
ventilation is provided in accordance with the International
Mechanical Code.
12. Corrosives shall not
include personal or household products in their original
packaging used in retail display or commonly used building
materials.
13 Buildings and structures
occupied for aerosol storage shall be classified as Group
S-1, provided that such buildings conform to the requirements
of the International Fire Code.
14. Display and storage of
nonflammable solid and nonflammable or noncombustible
liquid hazardous materials in quantities not exceeding
the maximum allowable quantity per control area in Group
M or S occupancies complying with Section
414.2.5.
15. The storage of black
powder, smokeless propellant and small arms primers in
Groups M and R-3 and special industrial explosive devices
in Groups B, F, M and S, provided such storage conforms
to the quantity limits and requirements prescribed in
the International Fire Code.
307.1.1 Hazardous materials.
Hazardous materials in any quantity shall conform to the
requirements of this code, including Section
414, and the International Fire Code.
[F] 307.2 Definitions.
The following words and terms shall, for the purposes of this
section and as used elsewhere in this code, have the meanings
shown herein.
AEROSOL. A product that
is dispensed from an aerosol container by a propellant. Aerosol
products shall be classified by means of the calculation of
their chemical heats of combustion and shall be designated
Level 1, 2 or 3.
Level 1 aerosol products.
Those with a total chemical heat of combustion that is less
than or equal to 8,600 British thermal units per pound (Btu/lb)
(20 kJ/g).
Level 2 aerosol products.
Those with a total chemical heat of combustion that is greater
than 8,600 Btu/lb (20 kJ/g), but less than or equal to 13,000
Btu/lb (30 kJ/g).
Level 3 aerosol products.
Those with a total chemical heat combustion that is greater
than 13,000 Btu/lb (30 kJ/g).
AEROSOL CONTAINER. A metal
can or a glass or plastic bottle designed to dispense an aerosol.
Metal cans shall be limited to a maximum size of 33.8 fluid
ounces (1,000 ml). Glass or plastic bottles shall be limited
to a maximum size of 4 fluid ounces (118 ml).
BALED COTTON. A natural
seed fiber wrapped in and secured with industry accepted materials,
usually consisting of burlap, woven polypropylene, polyethylene
or cotton or sheet polyethylene, and secured with steel, synthetic
or wire bands or wire; also includes linters (lint removed
from the cottonseed) and motes (residual materials from the
ginning process).
BALED COTTON, DENSELY PACKED.
Cotton made into banded bales with a packing density of at
least 22 pounds per cubic foot (360 kg/m3), and
dimensions complying with the following: a length of 55 inches
(1397 ± 20 mm), a width of 21 inches (533.4 ± 20mm)and a height
of 27.6 to 35.4 inches (701 to 899 mm).
BARRICADE. A structure
that consists of a combination of walls, floor and roof, which
is designed to withstand the rapid release of energy in an
explosion and which is fully confined, partially vented or
fully vented; or other effective method of shielding from
explosive materials by a natural or artificial barrier. Artificial
barricade. An artificial mound or revetment a minimum thickness
of 3 feet (914 mm). Natural barricade. Natural features of
the ground, such as hills, or timber of sufficient density
that the surrounding exposures that require protection cannot
be seen from the magazine or building containing explosives
when the trees are bare of leaves.
BOILING POINT. The temperature
at which the vapor pressure of a liquid equals the atmospheric
pressure of 14.7 pounds per square inch (psi) (101 kPa) gage
or 760 mm of mercury. Where an accurate boiling point is unavailable
for the material in question, or for mixtures which do not
have a constant boiling point, for the purposes of this classification,
the 20-percent evaporated point of a distillation performed
in accordance with ASTM D 86 shall be used as the boiling
point of the liquid.
CLOSED SYSTEM. The use
of a solid or liquid hazardous material involving a closed
vessel or system that remains closed during normal operations
where vapors emitted by the product are not liberated outside
of the vessel or system and the product is not exposed to
the atmosphere during normal operations; and all uses of compressed
gases. Examples of closed systems for solids and liquids include
product conveyed through a piping system into a closed vessel,
system or piece of equipment.
COMBUSTIBLE DUST. Finely
divided solid material that is 420 microns or less in diameter
and which, when dispersed in air in the proper proportions,
could be ignited by a flame, spark or other source of ignition.
Combustible dust will pass through a U.S. No. 40 standard
sieve.
COMBUSTIBLE FIBERS. Readily
ignitable and free-burning materials in a fibrous or shredded
form, such as cocoa fiber, cloth, cotton, excelsior, hay,
hemp, henequen, istle, jute, kapok, oakum, rags, sisal, Spanish
moss, straw, tow, wastepaper, certain synthetic fibers or
other like materials. This definition does not include densely
packed baled cotton.
COMBUSTIBLE LIQUID. A
liquid having a closed cup flash point at or above 100°F (38°C).
Combustible liquids shall be subdivided as follows: Class
II. Liquids having a closed cup flash point at or above 100°F
(38°C) and below 140°F (60°C). Class IIIA. Liquids having
a closed cup flash point at or above 140°F (60°C) and below
200°F (93° ). Class IIIB. Liquids having a closed cup flash
point at or above 200°F (93°C). The category of combustible
liquids does not include compressed gases or cryogenic fluids.
COMPRESSED GAS. A material,
or mixture of materials which:
1. Is a gas at 68°F (20°C)
or less at 14.7 pounds per square inch atmosphere (psia)
(101 kPa) of pressure; and
2. Has a boiling point of 68°F
(20°C) or less at 14.7 psia (101 kPa) which is either liquefied,
non liquefied or in solution, except those gases which have
no other health or physical-hazard properties are not considered
to be compressed until the pressure in the packaging exceeds
41 psia (282 kPa) at 68°F (20°C).
The states of a compressed
gas are categorized as follows:
1. Non liquefied compressed
gases are gases, other than those in solution, which are
in a packaging under the charged pressure and are entirely
gaseous at a temperature of 68°F (20°C).
2. Liquefied compressed gases
are gases that, in a packaging under the charged pressure,
are partially liquid at a temperature of 68°F (20°C).
3. Compressed gases in solution
are nonliquefied gases that are dissolved in a solvent.
4. Compressed gas mixtures
consist of a mixture of two or more compressed gases contained
in a packaging, the hazard properties of which are represented
by the properties of the mixture as a whole.
CONTROL AREA. Spaces within
a building where quantities of hazardous materials not exceeding
the maximum allowable quantities per control area are stored,
dispensed, used or handled. See also the definition of Outdoor
control area in the International Fire Code.
CORROSIVE. A chemical
that causes visible destruction of, or irreversible alterations
in, living tissue by chemical action at the point of contact.
A chemical shall be considered corrosive if, when tested on
the intact skin of albino rabbits by the method described
in DOTn 49 CFR, Part 173.137, such a chemical destroys or
changes irreversibly the structure of the tissue at the point
of contact following an exposure period of 4 hours. This term
does not refer to action on inanimate surfaces.
CRYOGENIC FLUID.
A liquid having a boiling point lower than -150°F (-101°C)
at 14.7 pounds per square inch atmosphere (psia) (an absolute
pressure of 101 kPa).
DAY BOX. A portable
magazine designed to hold explosive materials constructed
in accordance with the requirements for a Type 3 magazine
as defined and classified in Chapter 33 of the International
Fire Code.
DEFLAGRATION. An exothermic
reaction, such as the extremely rapid oxidation of a flammable
dust or vapor in air, in which the reaction progresses through
the unburned material at a rate less than the velocity of
sound. A deflagration can have an explosive effect.
DETACHED BUILDING. A separate
single-story building, without a basement or crawl space,
used for the storage or use of hazardous materials and located
an approved distance from all structures.
DETONATION. An exothermic
reaction characterized by the presence of a shock wave in
the material which establishes and maintains the reaction.
The reaction zone progresses through the material at a rate
greater than the velocity of sound. The principal heating
mechanism is one of shock compression. Detonations have an
explosive effect.
DISPENSING. The pouring
or transferring of any material from a container, tank or
similar vessel, whereby vapors, dusts, fumes, mists or gases
are liberated to the atmosphere.
EXPLOSIVE. Any chemical
compound, mixture or device, the primary or common purpose
of which is to function by explosion. The term includes, but
is not limited to, dynamite, black powder, pellet powder,
initiating explosives, detonators, safety fuses, squibs, detonating
cord, igniter cord, igniters and display fireworks, 1.3G (Class
B, Special). The term explosive includes any material
determined to be within the scope of USC Title 18: Chapter
40 and also includes any material classified as an explosive
other than consumer fireworks, 1.4G (Class C, Common) by the
hazardous materials regulations of DOTn 49 CFR.
High explosive. Explosive
material, such as dynamite, which can be caused to detonate
by means of a No. 8 test blasting cap when unconfined.
Low explosive. Explosive
material that will burn or deflagrate when ignited. It is
characterized by a rate of reaction that is less than the
speed of sound. Examples of low explosives include, but are
not limited to, black powder; safety fuse; igniters; igniter
cord; fuse lighters; fireworks, 1.3G (Class B, Special) and
propellants, 1.3C.
Mass-detonating explosives.
Division 1.1, 1.2 and 1.5 explosives alone or in combination,
or loaded into various types of ammunition or containers,
most of which can be expected to explode virtually instantaneously
when a small portion is subjected to fire, severe concussion,
impact, the impulse of an initiating agent or the effect of
a considerable discharge of energy from without. Materials
that react in this manner represent a mass explosion hazard.
Such an explosive will normally cause severe structural damage
to adjacent objects. Explosive propagation could occur immediately
to other items of ammunition and explosives stored sufficiently
close to and not adequately protected from the initially exploding
pile with a time interval short enough so that two or more
quantities must be considered as one for quantity-distance
purposes.
UN/DOTn Class 1 explosives.
The former classification system used by DOTn included the
terms high and low explosives as defined
herein. The following terms further define explosives under
the current system applied by DOTn for all explosive materials
defined as hazard Class 1 materials. Compatibility group letters
are used in concert with the division to specify further limitations
on each division noted (i.e., the letter G identifies the
material as a pyrotechnic substance or article containing
a pyrotechnic substance and similar materials).
Division 1.1.
Explosives that have a mass explosion hazard. A mass explosion
is one which affects almost the entire load instantaneously.
Division 1.2. Explosives
that have a projection hazard but not a mass explosion hazard.
Division 1.3. Explosives
that have a fire hazard and either a minor blast hazard
or a minor projection hazard or both, but not a mass explosion
hazard.
Division 1.4. Explosives
that pose a minor explosion hazard. The explosive effects
are largely confined to the package and no projection of
fragments of appreciable size or range is to be expected.
An external fire must not cause virtually instantaneous
explosion of almost the entire contents of the package.
Division 1.5.
Very insensitive explosives. This division is comprised
of substances that have a mass explosion hazard, but that
are so insensitive there is very little probability of initiation
or of transition from burning to detonation under normal
conditions of transport.
Division 1.6.
Extremely insensitive articles which do not have a mass
explosion hazard. This division is comprised of articles
that contain only extremely insensitive detonating substances
and which demonstrate a negligible probability of accidental
initiation or propagation.
FIREWORKS. Any composition
or device for the purpose of producing a visible or audible
effect for entertainment purposes by combustion, deflagration
or detonation that meets the definition of 1.4G fireworks
or 1.3G fireworks as set forth herein.
FIREWORKS, 1.3G. (Formerly
Class B, Special Fireworks.) Large fireworks devices, which
are explosive materials, intended for use in fireworks displays
and designed to produce audible or visible effects by combustion,
deflagration or detonation. Such 1.3G fireworks include, but
are not limited to, firecrackers containing more than 130
milligrams (2 grains) of explosive composition, aerial shells
containing more than 40 grams of pyrotechnic composition,
and other display pieces which exceed the limits for classification
as 1.4G fireworks. Such 1.3G fireworks are also described
as fireworks, UN0335 by the DOTn.
FIREWORKS, 1.4G. (Formerly
Class C, Common Fireworks.) Small fireworks devices containing
restricted amounts of pyrotechnic composition designed primarily
to produce visible or audible effects by combustion. Such
1.4G fireworks which comply with the construction, chemical
composition and labeling regulations of the DOTn for fireworks,
UN0336, and the U.S. Consumer Product Safety Commission (CPSC)
as set forth in CPSC 16 CFR: Parts 1500 and 1507, are not
explosive materials for the purpose of this code.
FLAMMABLE GAS. A material
that is a gas at 68°F (20°C) or less at 14.7 pounds per square
inch atmosphere (psia) (101 kPa) of pressure [a material that
has a boiling point of 68°F (20°C) or less at 14.7 psia (101
kPa)] which:
1. Is ignitable at 14.7 psia
(101 kPa) when in a mixture of 13 percent or less by volume
with air; or
2. Has a flammable range at
14.7 psia (101 kPa) with air of at least 12 percent, regardless
of the lower limit. The limits specified shall be determined
at 14.7 psi (101 kPa) of pressure and a temperature of 68°F
(20°C) in accordance with ASTM E 681.
FLAMMABLE LIQUEFIED GAS.
A liquefied compressed gas which, under a charged pressure,
is partially liquid at a temperature of 68°F (20°C) and which
is flammable.
FLAMMABLE LIQUID. A liquid
having a closed cup flash point below 100°F (38°C). Flammable
liquids are further categorized into a group known as Class
I liquids. The Class I category is subdivided as follows:
Class IA. Liquids having a flash point below 73°F (23°C) and
a boiling point below 100°F (38°C). Class IB. Liquids having
a flash point below 73°F (23°C) and a boiling point at or
above 100°F (38°C). Class IC. Liquids having a flash point
at or above 73°F (23°C) and below 100°F (38°C). The category
of flammable liquids does not include compressed gases or
cryogenic fluids.
FLAMMABLE MATERIAL. A
material capable of being readily ignited from common sources
of heat or at a temperature of 600°F (316°C) or less.
FLAMMABLE SOLID. A solid,
other than a blasting agent or explosive, that is capable
of causing fire through friction, absorption or moisture,
spontaneous chemical change, or retained heat from manufacturing
or processing, or which has an ignition temperature below
212°F (100°C) or which burns so vigorously and persistently
when ignited as to create a serious hazard. A chemical shall
be considered a flammable solid as determined in accordance
with the test method of CPSC 16 CFR; Part 1500.44, if it ignites
and burns with a self-sustained flame at a rate greater than
0.1 inch (2.5mm)per second along its major axis.
FLASH POINT. The minimum
temperature in degrees Fahrenheit at which a liquid will give
off sufficient vapors to form an ignitable mixture with air
near the surface or in the container, but will not sustain
combustion. The flash point of a liquid shall be determined
by appropriate test procedure and apparatus as specified in
ASTM D 56, ASTM D 93 or ASTM D 3278.
HANDLING. The deliberate
transport by any means to a point of storage or use.
HAZARDOUS MATERIALS. Those
chemicals or substances that are physical hazards or health
hazards as defined and classified in this section and the
International Fire Code, whether the materials are in usable
or waste condition.
HEALTH HAZARD. A classification
of a chemical for which there is statistically significant
evidence that acute or chronic health effects are capable
of occurring in exposed persons. The term health hazard
includes chemicals that are toxic or highly toxic, and corrosive.
HIGHLY TOXIC. A material
which produces a lethal dose or lethal concentration that
falls with in any of the following categories:
1. A chemical that has a median
lethal dose (LD50) of 50milligrams or less per kilogram
of body weight when admin- istered orally to albino rats
weighing between 200 and 300 grams each.
2. A chemical that has a median
lethal dose (LD50) of 200 milligrams or less per kilogram
of body weight when administered by continuous contact for
24 hours (or less if death occurs within 24 hours) with
the bare skin of albino rabbits weighing between 2 and 3
kilograms each.
3. A chemical that has a median
lethal concentration (LC50) in air of 200 parts per million
by volume or less of gas or vapor, or 2 milligrams per liter
or less of mist, fume or dust, when administered by continuous
inhalation for 1 hour (or less if death occurs within 1
hour) to albino rats weighing between 200 and 300 grams
each. Mixtures of these materials with ordinary materials,
such as water, might not warrant classification as highly
toxic. While this system is basically simple in application,
any hazard evaluation that is required for the precise
categorization of this type of material shall be performed
by experienced, technically competent persons.
INCOMPATIBLE MATERIALS.
Materials that, when mixed, have the potential to react in
a manner that generates heat, fumes, gases or byproducts which
are hazardous to life or property.
OPEN SYSTEM. The use of
a solid or liquid hazardous material involving a vessel or
system that is continuously open to the atmosphere during
normal operations and where vapors are liberated, or the product
is exposed to the atmosphere during normal operations. Examples
of open systems for solids and liquids include dispensing
from or into open beakers or containers, dip tank and plating
tank operations.
OPERATING BUILDING. A
building occupied in conjunction with the manufacture, transportation
or use of explosive materials. Operating buildings are separated
from one another with the use of intraplant or intraline distances.
ORGANIC PEROXIDE. An organic
compound that contains the bivalent -O-O- structure and which
may be considered to be a structural derivative of hydrogen
peroxide where one or both of the hydrogen atoms have been
replaced by an organic radical. Organic peroxides can pose
an explosion hazard (detonation or deflagration) or they can
be shock sensitive. They can also decompose into various unstable
compounds over an extended period of time.
Class I. Those formulations
that are capable of deflagration but not detonation.
Class II. Those formulations
that burn very rapidly and that pose a moderate reactivity
hazard.
Class III. Those formulations
that burn rapidly and that pose a moderate reactivity hazard.
Class IV. Those formulations
that burn in the same manner as ordinary combustibles and
that pose a minimal reactivity hazard.
Class V. Those formulations
that burn with less intensity than ordinary combustibles
or do not sustain combustion and that pose no reactivity hazard.
Unclassified detonable. Organic peroxides that are capable
of detonation. These peroxides pose an extremely high explosion
hazard through rapid explosive decomposition.
OXIDIZER. A material that
readily yields oxygen or other oxidizing gas, or that readily
reacts to promote or initiate combustion of combustible materials.
Examples of other oxidizing gases include bromine, chlorine
and fluorine.
Class 4. An oxidizer
that can undergo an explosive reaction due to contamination
or exposure to thermal or physical shock. Additionally,
the oxidizer will enhance the burning rate and can cause
spontaneous ignition of combustibles.
Class 3. An oxidizer
that will cause a severe increase in the burning rate of
combustible materials with which it comes in contact or
that will undergo vigorous self-sustained decomposition
due to contamination or exposure to heat.
Class 2. An oxidizer
that will cause a moderate increase in the burning rate
or that causes spontaneous ignition of combustible materials
with which it comes in contact.
Class 1. An oxidizer
whose primary hazard is that it slightly increases the burning
rate but which does not cause spontaneous ignition when
it comes in contact with combustible materials.
OXIDIZING GAS. A gas that
can support and accelerate combustion of other materials.
PHYSICAL HAZARD. A chemical
for which there is evidence that it is a combustible liquid,
compressed gas, cryogenic, explosive, flammable gas, flammable
liquid, flammable solid, organic peroxide, oxidizer, pyrophoric
or unstable (reactive) or water-reactive material.
PYROPHORIC. A chemical
with an autoignition temperature in air, at or below a temperature
of 130°F (54.4°C). PYROTECHNIC COMPOSITION. A chemical mixture
that produces visible light displays or sounds through a self-propagating,
heat-releasing chemical reaction which is initiated by ignition.
TOXIC. A chemical falling
within any of the following categories:
1. A chemical that has a median
lethal dose (LD50) of more than 50 milligrams per kilogram,
but not more than 500 milligrams per kilogram of body weight
when administered orally to albino rats weighing between
200 and 300 grams each.
2. A chemical that has a median
lethal dose (LD50) of more than 200 milligrams per kilogram
but not more than 1,000 milligrams per kilogram of body
weight when administered by continuous contact for 24 hours
(or less if death occurs within 24 hours) with the bare
skin of albino rabbits weighing between 2 and 3 kilograms
each.
3. A chemical that has a median
lethal concentration (LC50) in air of more than 200 parts
per million but not more than 2,000 parts per million by
volume of gas or vapor, or more than 2 milligrams per liter
but not more than 20 milligrams per liter of mist, fume
or dust, when administered by continuous inhalation for
1 hour (or less if death occurs within 1 hour) to albino
rats weighing between 200 and 300 grams each.
UNSTABLE (REACTIVE) MATERIAL.
A material, other than an explosive, which in the pure state
or as commercially produced, will vigorously polymerize, decompose,
condense or become self-reactive and undergo other violent
chemical changes, including explosion, when exposed to heat,
friction or shock, or in the absence of an inhibitor, or in
the presence of contaminants, or in contact with incompatible
materials. Unstable (reactive) materials are subdivided as
follows:
Class 4. Materials that
in themselves are readily capable of detonation or explosive
decomposition or explosive reaction at normal temperatures
and pressures. This class includes materials that are sensitive
to mechanical or localized thermal shock at normal temperatures
and pressures.
Class 3. Materials that
in themselves are capable of detonation or of explosive
decomposition or explosive reaction but which require a
strong initiating source or which must be heated under confinement
before initiation. This class includes materials that are
sensitive to thermal or mechanical shock at elevated temperatures
and pressures.
Class 2. Materials that
in themselves are normally unstable and readily undergo
violent chemical change but do not detonate. This class
includes materials that can undergo chemical change with
rapid release of energy at normal temperatures and pressures,
and that can undergo violent chemical change at elevated
temperatures and pressures.
Class 1. Materials that
in themselves are normally stable but which can become unstable
at elevated temperatures and pressure.
WATER-REACTIVE MATERIAL.
A material that explodes; violently reacts; produces flammable,
toxic or other hazardous gases; or evolves enough heat to
cause autoignition or ignition of combustibles upon exposure
to water or moisture.
Water-reactive materials are
subdivided as follows:
Class 3. Materials that
react explosively with water without requiring heat or confinement.
Class 2. Materials that
react violently with water or have the ability to boil water.
Materials that produce flammable, toxic or other hazardous
gases or evolve enough heat to cause autoignition or ignition
of combustibles upon exposure to water or moisture.
Class 1. Materials that
react with water with some release of energy, but not violently.
[F] 307.3 High-hazard Group
H-1. Buildings and structures containing materials that
pose a detonation hazard shall be classified as Group H-1.
Such materials shall include, but not be limited to, the following:
Explosives:
Division 1.1
Division 1.2
Division 1.3
Exception: Materials that
are used and maintained in a form where either confinement
or configuration will not elevate the hazard from a mass fire
to mass explosion hazard shall be allowed in H-2 occupancies.
Division 1.4
Exception: Articles, including
articles packaged for shipment, that are not regulated as
an explosive under Bureau of Alcohol, Tobacco and Firearms
regulations, or unpackaged articles used in process operations
that do not propagate a detonation or deflagration between
articles shall be allowed in H-3 occupancies.
Division 1.5
Division 1.6
Organic peroxides, unclassified
detonable Oxidizers, Class 4 Unstable (reactive) materials,
Class 3 detonable and Class 4 Detonable pyrophoric materials
[F] 307.4 High-hazard Group
H-2. Buildings and structures containing materials that
pose a deflagration hazard or a hazard from accelerated burning
shall be classified as Group H-2. Such materials shall include,
but not be limited to, the following:
Class I, II or IIIA flammable
or combustible liquids which are used or stored in normally
open containers or systems, or in closed containers or systems
pressurized at more than 15 psi (103.4 kPa) gage.
Combustible dusts Cryogenic fluids,
flammable Flammable gases Organic peroxides, Class I Oxidizers,
Class 3, that are used or stored in normally open containers
or systems, or in closed containers or systems pressurized
at more than 15 psi (103 kPa) gage Pyrophoric liquids, solids
and gases, non detonable Unstable (reactive) materials, Class
3, non detonable Water-reactive materials, Class 3
[F] 307.5 High-hazard Group
H-3. Buildings and structures containing materials that
readily support combustion or that pose a physical hazard
shall be classified as Group H-3. Such materials shall include,
but not be limited to, the following:
Class I, II or IIIA flammable
or combustible liquids that are used or stored in normally
closed containers or systems pressurized at 15 pounds per
square inch gauge (103.4 kPa) or less Combustible fibers,
other than densely packed baled cotton Consumer fireworks,
1.4G (Class C, Common) Cryogenic fluids, oxidizing Flammable
solids Organic peroxides, Class II and III Oxidizers, Class
2 Oxidizers, Class 3, that are used or stored in normally
closed containers or systems pressurized at 15 pounds per
square inch gauge (103 kPa) or less Oxidizing gases Unstable
(reactive) materials, Class 2 Water-reactive materials, Class
2
[F] 307.6 High-hazard Group
H-4. Buildings and structures which contain materials
that are health hazards shall be classified as Group H-4.
Such materials shall include, but not be limited to, the following:
Corrosives Highly toxic materials Toxic materials
[F] 307.7 High-hazard Group
H-5 structures. Semiconductor fabrication facilities and
comparable research and development areas in which hazardous
production materials (HPM) are used and the aggregate quantity
of materials is in excess of those listed in Tables
307.1(1) and 307.1(2)
shall be classified as Group H-5. Such facilities and areas
shall be designed and constructed in accordance with Section
415.8.
[F] 307.8 Multiple hazards.
Buildings and structures containing a material or materials
representing hazards that are classified in one or more of
Groups H-1, H-2, H-3 and H-4 shall conform to the code requirements
for each of the occupancies so classified.
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