Questions and Answers
What are DOT Hazard Class 4 materials?
What materials does Class 4.1 consist of?
What are pyrophoric materials?
Liquids or solids that can ignite within five minutes after coming in contact with air.
What do Class 4.3 materials release when they come into contact with water?
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What are organic peroxides classified as?
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What do oxidizers do?
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What substances does Class 6.1 consist of?
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What does Class 6.2 include?
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What must small packages of radioactive materials have?
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What are Class 8 materials?
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What does DOT Hazard Class 9 consist of?
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What is one type of container used for radioactive materials?
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What are indicators of possible criminal or terrorist activity involving radiological agents?
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What is OSHA responsible for?
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What is polymerization?
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What should you do if you suspect a hazardous material is present at an incident?
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Match the following classes with their definitions:
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Study Notes
Hazardous Materials Overview
- DOT Hazard Class 4 includes solids divided into three categories: flammable, spontaneously combustible, and water-reactive materials.
Class 4.1 — Flammable Solids
- Flammable solids can be wetted explosives, self-reactive materials, or readily combustible solids.
Class 4.2 — Spontaneously Combustible Materials
- Characterized by pyrophoric materials igniting quickly upon contact with air and self-heating materials that heat up without an energy source.
Class 4.3 — Water-Reactive Materials
- These solids release flammable or toxic gas when in contact with water, with a release rate exceeding 1 liter per kilogram per hour.
Class 5.2 — Organic Peroxides
- Organic peroxides are unstable and may spontaneously combust; eight types exist, detailed in the Emergency Response Guidebook (ERG).
Class 5.1 — Oxidizers
- Oxidizers facilitate combustion by yielding oxygen; ammonium nitrate is a common example.
Class 6.1 — Toxic Poisons
- This class includes any non-gas toxic materials posing health hazards during transportation.
Class 6.2 — Infectious Substances
- Contains pathogens or substances suspected of containing them, which can cause disease in humans or animals.
Class 7 — Radioactive Materials
- Radioactive materials require distinctive labeling for small packages that cannot be detected by senses.
Class 8 — Corrosives
- Corrosive materials can cause visible or irreversible damage to skin or materials upon contact.
Class 9 — Miscellaneous Hazardous Materials
- Covers materials posing transport hazards and can cause discomfort, especially during air travel.
Container Types for Radioactive Materials
- Various containers include bags, carboys, cylinders, drums, and dewars.
Types of Tank Trucks
- Tank trucks for hazardous materials include high pressure, cryogenic, low pressure chemical, and dry bulk cargo trailers.
Pesticide Container Labels
- Pesticide and agricultural chemical containers may be marked with CAUTION, WARNING, or DANGER.
Shipping Papers for Transportation
- Shipping papers vary by mode: highway, rail, water, and air, and include UN/NA numbers for hazardous materials.
Emergency Procedures
- If UN/NA numbers are unavailable, contact CHEMTREC (U.S.) or CANUTEC (Canada) for assistance.
NFPA's Standard 704 Marking System
- A color-coded system used by responders to identify hazards and necessary safety measures during incidents.
NFPA Marking Colors
- Blue indicates health hazards, red indicates flammability hazards, yellow denotes reactivity, and white provides special hazard information.
Explosives Classification
- Division 1 (mass detonation), Division 2 (fragmentation risk), Division 3 (mass fire hazard), Division 4 (moderate fire hazard).
Military Chemical Warning Signs
- Colors indicate toxicity levels (red for highly toxic, yellow for harassing agents, etc.), with specific markings for water-reactive materials.
Pipeline Indicators
- Markers on pipelines provide product information, ownership details, and emergency contact numbers.
Indicators of Terrorism or Criminal Activity
- Signs include suspicious packages, radiation detection activation, and casualties with similar symptoms.
Identification of Hazardous Substances
- Use ERG, shipping papers, or contact responsible parties to identify hazardous materials at incidents.
Factors Affecting Response to Hazardous Materials
- Three key factors: timing of release, dispersion area size, and material lethality.
Emergency Response Guidebook (ERG) Sections
- The ERG is divided into colors for specific information: yellow for UN numbers, blue for material names, orange for hazards, and green for isolation distances.
Polymerization Hazards
- A chemical reaction that can lead to explosions or ruptures due to heat and pressure.
Responsibilities at the Awareness Level
- Responsibilities include calling for trained personnel, recognizing hazardous materials, protecting oneself, and securing the area.
Identifying an Oxidizer
- An oxidizer is defined as a material that yields oxygen and enhances combustion.
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Description
Test your knowledge about DOT Hazard Class 4 materials, which include flammable solids, spontaneously combustible items, and water-reactive substances. Use these flashcards to familiarize yourself with the definitions and classifications under this category of hazardous materials.
