DOT Hazard Classes and Divisions

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Questions and Answers

The DOT has classified hazardous materials/WMD according to their _____

primary danger

What does Class 1 represent?

explosives

What does Class 2 represent?

gases

What does Class 3 represent?

<p>flammable and combustible liquids</p> Signup and view all the answers

What does Class 4 represent?

<p>flammable and combustible solids</p> Signup and view all the answers

What does Class 5 represent?

<p>oxidizers</p> Signup and view all the answers

What does Class 6 represent?

<p>poison</p> Signup and view all the answers

What does Class 7 represent?

<p>radioactive</p> Signup and view all the answers

What does Class 8 represent?

<p>corrosive</p> Signup and view all the answers

What does Class 9 represent?

<p>miscellaneous</p> Signup and view all the answers

Class 1 major hazard is?

<p>explosion</p> Signup and view all the answers

Class 2 major hazard is?

<p>BLEVE (Boiling Liquid Expanding Vapor Explosion)</p> Signup and view all the answers

Class 3 major hazard?

<p>burns readily</p> Signup and view all the answers

Class 4 major hazard?

<p>rapid combustion with a huge smoke</p> Signup and view all the answers

Division 5.1 major hazard?

<p>supports combustion, intensifies fire</p> Signup and view all the answers

Division 5.2 major hazard?

<p>unstable/reactive explosives</p> Signup and view all the answers

Class 6 major hazard?

<p>toxicity, infectious</p> Signup and view all the answers

Class 7 major hazard?

<p>radioactive poisonous burns</p> Signup and view all the answers

Class 8 major hazard?

<p>burns/emulsification skin damage</p> Signup and view all the answers

Class 9 hazards represent?

<p>a material that presents a hazard during transport, but that is not included in another hazard class</p> Signup and view all the answers

Class 1 placard: Color: _____

<p>orange</p> Signup and view all the answers

Class 1 placard: Picture: _____

<p>bursting ball (1.1-1.3), none (1.4-1.6)</p> Signup and view all the answers

Class 1 placard: Words: _____

<p>explosives (1.1-1.4, 1.6), blasting agents (1.5)</p> Signup and view all the answers

What is Division 1.1?

<p>mass explosion hazard</p> Signup and view all the answers

Division 1.1 example?

<p>dynamite, TNT</p> Signup and view all the answers

What is Division 1.2?

<p>projection hazard</p> Signup and view all the answers

Division 1.2 example?

<p>aerial flares, detonation cord, power device cartridges</p> Signup and view all the answers

What is Division 1.3?

<p>fire hazard</p> Signup and view all the answers

Division 1.3 example?

<p>liquid-fueled rocket motors</p> Signup and view all the answers

What is Division 1.4?

<p>minor explosion hazard</p> Signup and view all the answers

Division 1.4 example?

<p>practice ammunition</p> Signup and view all the answers

In Division 1.4, no device may contain more than _____ grams (_____ oz) of a detonating material.

<p>25, 0.9</p> Signup and view all the answers

What is Division 1.5?

<p>very insensitive explosions</p> Signup and view all the answers

Division 1.5 example?

<p>prilled ammonium nitrate fertilizer</p> Signup and view all the answers

What is Division 1.6?

<p>extremely insensitive explosive</p> Signup and view all the answers

Division 1.6 example?

<p>explosive squib devices</p> Signup and view all the answers

What are Class 2 subhazards?

<p>flammable, oxidizer, poisonous</p> Signup and view all the answers

What are the 4 types of placards for Class 2?

<p>flammable, non-flammable, oxidizer, poison gas</p> Signup and view all the answers

What is Division 2.1?

<p>flammable gas</p> Signup and view all the answers

Flammable gas (Division 2.1) means any material that is a gas (boiling point) at _____ deg C (_____ deg F) or less and _____ kPa/_____ psi of pressure.

<p>20, 68, 101.3, 14.7</p> Signup and view all the answers

Also, ignitable at _____ kPa/ _____ psi when in a mixture of _____% or less by volume with air.

<p>101.3, 14.7, 13</p> Signup and view all the answers

OR has a flammable range at _____ kPa/ _____ psi with air of at least _____% regardless of the lower limit.

<p>101.3, 14.7, 12</p> Signup and view all the answers

Division 2.1 example?

<p>propane</p> Signup and view all the answers

What is Division 2.2?

<p>nonflammable, nonpoisonous gas</p> Signup and view all the answers

A nonflammable, nonpoisonous compressed gas means any material that exerts in the packaging an absolute pressure of _____ kPa/_____ psi at _____ deg C/_____ deg F.

<p>280, 41, 20, 68</p> Signup and view all the answers

A cryogenic liquid means a refrigerated, liquefied gas having a boiling point colder than _____ deg C/ _____ deg F.

<p>-90, -130</p> Signup and view all the answers

Division 2.2 examples?

<p>anhydrous ammonia, cryogenic argon, carbon dioxide, compressed nitrogen</p> Signup and view all the answers

What is Division 2.3?

<p>poisonous gas</p> Signup and view all the answers

Flammable liquid: any liquid having a flash point of not more than _____ deg F.

<p>140</p> Signup and view all the answers

Flammable liquid examples?

<p>acetone, gasoline, methyl alcohol, toluene</p> Signup and view all the answers

Combustible liquid: any liquid that does not meet the definition of any other hazard class and has a flash point above _____ deg C/ _____ deg F and below _____ deg C/ _____ deg F.

<p>60, 140, 93, 200</p> Signup and view all the answers

Combustible liquid example?

<p>fuel oil</p> Signup and view all the answers

What is Division 4.1?

<p>flammable solid</p> Signup and view all the answers

What is Division 4.2?

<p>spontaneously combustible</p> Signup and view all the answers

What is Division 4.3?

<p>dangerous when wet</p> Signup and view all the answers

Explosives wetted with sufficient water, alcohol or plasticizer to suppress explosive properties are called?

<p>desensitized explosives</p> Signup and view all the answers

What are self-reactive materials?

<p>Materials that are liable to undergo exothermic decomposition</p> Signup and view all the answers

What are readily combustible solids?

<p>Solids that may cause a fire through friction and any metal powders that can be ignited</p> Signup and view all the answers

Division 4.1 example?

<p>magnesium, nitrocellulose</p> Signup and view all the answers

Division 4.2 consists of _____ and _____.

<p>pyrophoric material, self-heating material</p> Signup and view all the answers

Division 4.1 consists of _____, _____ and _____.

<p>desensitized explosives, self-reactive materials, readily combustible solids</p> Signup and view all the answers

A liquid or solid that, even in small quantities and without an external ignition source, can ignite within five minutes after coming in contact with air is called?

<p>pyrophoric material</p> Signup and view all the answers

What is a self-heating material?

<p>A material that, when in contact with air and without an energy supply, is liable to self-heat</p> Signup and view all the answers

What are dangerous when wet materials?

<p>A material that, by contact with water, is liable to become spontaneously flammable or to give off flammable or toxic gas.</p> Signup and view all the answers

What does Division 5.1 represent?

<p>oxidizer</p> Signup and view all the answers

What does Division 5.2 represent?

<p>organic peroxide</p> Signup and view all the answers

What is an oxidizer?

<p>A material that may, generally by yielding oxygen, cause or enhance the combustion of other materials.</p> Signup and view all the answers

Division 5.1 example?

<p>ammonium nitrate</p> Signup and view all the answers

What is organic peroxide?

<p>An organic compound containing oxygen in the bivalent [O-O] structure</p> Signup and view all the answers

What are the types of Division 5.2?

<p>A, B, C, D, E, F, G</p> Signup and view all the answers

Transportation of which is forbidden?

<p>Type A organic peroxides</p> Signup and view all the answers

What does Division 5.2 types B represent?

<p>Neither detonates nor deflagrates rapidly, but can undergo a thermal explosion</p> Signup and view all the answers

What does Division 5.2 types C represent?

<p>Neither detonates nor deflagrates rapidly and cannot undergo thermal explosion</p> Signup and view all the answers

What does Division 5.2 types D represent?

<p>Detonates only partially or deflagrates slowly</p> Signup and view all the answers

What does Division 5.2 types E represent?

<p>Will not detonate, does not deflagrate, and shows low, or no, effect when heated under confinement</p> Signup and view all the answers

What does Division 5.2 types F represent?

<p>Will not detonate, does not deflagrate, and shows only a low, or no, effect if heated when confined</p> Signup and view all the answers

What does Division 5.2 types G represent?

<p>Will not detonate, does not deflagrate, shows no effect if heated when confined, and has low or no explosive power</p> Signup and view all the answers

Division 5.2 example?

<p>methyl ethyl ketone peroxide</p> Signup and view all the answers

What does Division 6.1 represent?

<p>poisonous materials</p> Signup and view all the answers

Division 6.1 examples?

<p>arsenic, tear gas</p> Signup and view all the answers

What does Division 6.2 represent?

<p>infectious substance</p> Signup and view all the answers

Division 6.2 examples?

<p>anthrax, botulism</p> Signup and view all the answers

Class 7 example?

<p>uranium</p> Signup and view all the answers

What is the dose per gram of Class 7?

<p>0.002 uCi/g</p> Signup and view all the answers

Class 8 examples?

<p>nitric acid, sulfuric acid</p> Signup and view all the answers

What does Class 9 represent?

<p>A material that presents a hazard during transport, but that is not included in another hazard class.</p> Signup and view all the answers

What does ORM-D stand for?

<p>A material that presents a limited hazard during transportation due to its form, quantity, and packaging.</p> Signup and view all the answers

ORM-D is a material that presents a limited hazard during transportation due to its _____, _____, and _____.

<p>form, quantity, packaging</p> Signup and view all the answers

ORM-D examples?

<p>consumer commodities, small arms ammunition, polishes</p> Signup and view all the answers

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Study Notes

DOT Hazard Classes and Divisions

  • Hazardous materials are classified by the DOT based on their primary danger.

Class 1: Explosives

  • Includes substances that can cause explosions.
  • Major hazard: explosion.
  • Examples: dynamite, TNT.

Class 2: Gases

  • Subcategories based on properties: flammable, non-flammable, oxidizer, poisonous.
  • Major hazard includes BLEVE (Boiling Liquid Expanding Vapor Explosion).
  • Example of flammable gas: propane.

Class 3: Flammable and Combustible Liquids

  • Defined by a flash point of not more than 140°F.
  • Major hazard: burns readily.
  • Examples: acetone, gasoline.

Class 4: Flammable and Combustible Solids

  • Includes solids that ignite easily or combust spontaneously.
  • Subdivisions: flammable solids, spontaneously combustible, dangerous when wet.
  • Examples: magnesium, nitrocellulose.

Class 5: Oxidizers

  • Subdivided into Division 5.1 (oxidizers) and Division 5.2 (organic peroxides).
  • Major hazard: supports combustion.
  • Example of an oxidizer: ammonium nitrate.

Class 6: Poisonous Materials

  • Division 6.1: poisonous substances (e.g., arsenic, tear gas).
  • Division 6.2: infectious substances (e.g., anthrax, botulism).

Class 7: Radioactive Materials

  • Major hazard includes radiation exposure.
  • Example: uranium.

Class 8: Corrosive Materials

  • Substances that can cause severe damage upon contact with tissue.
  • Major hazard: burns and skin damage.
  • Examples: nitric acid, sulfuric acid.

Class 9: Miscellaneous

  • Materials that pose transportation hazards not covered in other classes.
  • Limited hazard based on form, quantity, packaging (ORM-D).

Placards and Labels

  • Class 1: Orange with a bursting ball symbol indicating explosives.

Division Characteristics

  • Division 1.1: mass explosion hazard.
  • Division 1.4: minor explosion hazard, limited to 25 grams of detonating material.
  • Division 5.2: Types range from A (forbidden transportation) to G (stable and desensitized).

Flash Points

  • Flammable liquid flash point: not more than 140°F.
  • Combustible liquid flash point: between 140°F and 200°F.

Gas Characteristics

  • Flammable gas: gas with low boiling points and able to ignite at specified pressures.
  • Nonflammable, nonpoisonous gas: exerting specific pressures at defined temperatures.

Additional Materials

  • Desensitized explosives: explosives that have been treated to suppress explosive properties.
  • Self-reactive materials: may decompose exothermically due to temperature or contamination exposure.

Specifics on Oxidizers and Organic Peroxides

  • Oxidizers enhance combustion and can support fire.
  • Organic peroxides can include hazardous types and are categorized based on their stability and behavior under transport conditions.

Other Notable Points

  • ORM-D indicates materials presenting a limited hazard due to form, quantity, and packaging.
  • Examples of ORM-D: consumer commodities, small arms ammunition.

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