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

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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Description

Explore the various classes and divisions of hazardous materials as classified by the DOT. This quiz covers key definitions, major hazards, and examples for each class, including explosives, gases, and flammable liquids. Test your knowledge on the important distinctions between these hazardous materials.

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