Ultrasonic & Ozone Content Cleaning Flashcards

What is the OSHA permissible exposure limit (PEL) for ozone as an 8-hour time-weighted average?

Answer: 0.1 ppm

OSHA sets the PEL for ozone at 0.1 ppm (8-hr TWA) because even low concentrations can cause respiratory damage.

At approximately what ozone concentration can most people first detect its characteristic odor?

Answer: 0.01–0.05 ppm

Most people detect ozone's sharp, electrical smell at 0.01–0.05 ppm, which is at or below the OSHA PEL.

How does ozone chemically eliminate malodors in restoration applications?

Answer: It oxidizes odor-causing compounds, breaking their chemical bonds

Ozone's extra oxygen atom oxidizes odor-causing molecules, breaking their bonds and converting them into odorless or less offensive byproducts.

Which material is most resistant to ozone degradation and therefore safe for constructing ozone treatment chambers?

Answer: Stainless steel

Stainless steel resists ozone oxidation, making it the preferred material for ozone-contact vessels and chamber construction.

What respiratory protection is required when working in an area where ozone exceeds safe concentration limits?

Answer: Supplied-air respirator or SCBA

Ozone is a gas that passes through particulate filters, so only supplied-air respirators or SCBA provide adequate protection at elevated concentrations.

What happens to ozone naturally in a sealed, treated space at typical room temperature over time?

Answer: It decomposes back into oxygen (O₂)

Ozone is thermodynamically unstable with a half-life of roughly 20–30 minutes at room temperature, reverting to O₂ without any intervention.

Which scenario correctly describes an appropriate use of ozone in a residential content restoration project?

Answer: Treating a sealed, unoccupied room for several hours after source materials have been removed and surfaces cleaned

Ozone treatment is effective when applied to an unoccupied, sealed space after physical cleaning has removed bulk contamination, maximizing contact with residual odor sources.