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Difficulty: MediumHazardous Materials and Disposal

According to standard automotive shop safety regulations, what is the primary reason solvent-soaked wiping rags must be stored in an approved, self-closing metal container rather than an open trash can?

  1. To restrict oxygen supply and contain heat from oxidation, preventing spontaneous combustionAnswer
  2. B
    To prevent solvent evaporation so the saturated rags can be laundered and reused indefinitely
  3. C
    To capture escaping volatile vapors and channel them to extinguish adjacent electrical fires
  4. D
    To maintain a continuous electrical ground pathway that prevents static shocks from power tools

Answer

Storing solvent-soaked rags in an approved, self-closing metal container restricts oxygen and dissipates oxidation heat, preventing spontaneous combustion.
Rags saturated with oils, finishing products, or petroleum solvents undergo natural oxidation when exposed to air. In an open pile or permeable container, this reaction generates heat that cannot dissipate, eventually reaching the flash point and causing spontaneous combustion. Approved self-closing metal containers seal out oxygen and contain any thermal buildup, eliminating the conditions required for a fire.

Step-by-Step Solution

1
Identify the chemical hazard associated with solvent- and oil-soaked shop rags.
Petroleum solvents and oils undergo a slow, exothermic oxidation reaction when exposed to air, releasing heat over time.
Understanding the chemical breakdown process identifies the primary shop hazard as a fire risk.
2
Evaluate how container design mitigates spontaneous ignition.
An airtight, spring-loaded lid cuts off the oxygen supply required for combustion, while the steel construction safely isolates and dissipates internal heat.
Fire requires fuel, heat, and oxygen; eliminating airflow prevents an oxidation reaction from reaching ignition temperature.

Key Concept

Hazardous Waste Containment and Spontaneous Combustion Prevention
Estimated Time:1m 0s
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Topics

Hazardous Materials and Disposal

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