Since they have only been in use in the restoration industry since 2008, it is still a science completely new to some restoration contractors. This May 2017 article breaks down a lot of the myths and misconceptions about hydroxyl generators. 2,000,000 per cubic centimeter), a 13-week toxicity study performed on rats under strict FDA GLP guidelines (no adverse effects), the amount of ozone produced so contractors comply with OSHA standards, and testing performed by the FDA which now classifies Odorox as a Class II medical device for use in occupied areas.” – Tom McArdle, Odorox Hydroxyl Group Examples of tests performed by independent parties include measuring the amount of hydroxyls produced (approx. “….Odorox has invested significant time and expenses in safety testing. If a homeowner cannot leave or a store cannot shut down, hydroxyl generators are the way to go.” – Russ McCubbin, International Ozone Ozone can bleach wet materials and damage natural rubber. “Ozone is only to be used in unoccupied areas with return to the area at least one hour after the machine has turned off. One topic was addressing client concerns about ozone or hydroxyls. In early 2017, three industry experts weighed in on a number of things related to odor removal. In this study, it was proven that the hydroxy generators significantly reduced the overall levels of contaminants in less the 8 hours, and it was determined that hydroxyl generators make these environments safer for occupancy and remediation work. This study also points out that some environments, specifically post-fire ones, can contain very high levels of VOCs and are not safe to occupy without proper personal protective equipment. In this study, the quantities of all byproducts were significantly below OSHA standards, and were in the very low parts per billion range.” That breakdown creates byproducts, which confirms the science of the cascade effect. “The sample results clearly demonstrated hydroxyl radicals have a positive effect on the safety of an environment by dramatically reducing VOC levels after a fire. The technology allows contractors to run the generators while they’re performing their normal physical cleaning instead of afterwards, and enables clients to stay in their home or business when possible. This means hydroxyls are able to eliminate a much broader range of odors and VOCs as compared to ozone. The two primary differences, however, are that hydroxyls are scientifically confirmed to be far more reactive than ozone, and they’re safe to use with sensitive materials. Hydroxyl generators work in a way that is most similar to ozone in the sense that they produce oxidizing gasses that break apart odor molecules. The half-life of a hydroxyl radical is less than one second. Hydroxyl radicals, in essence, dismantle the molecular structure of odors and volatile organic compounds (VOCs), and react so quickly that indoor environments have few natural hydroxyls present because they are consumed the moment they enter the space. They rapidly decompose chemicals in the air and play a crucial role in keeping the earth’s atmosphere clear of harmful organic and inorganic compounds. Hydroxyl radicals (-OH) are created naturally in the atmosphere when the sun’s ultraviolent rays react with water vapor (H 2O) and oxygen (O 2).
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