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When Brazilian Keratin Treatment (BKT) solution is added to the hair and sealed with a flatiron, it releases fumes- in many cases, these fumes contain Formaldehyde.
Formaldehyde is a well-known chemical that is considered a carcinogen by the International Agency for Research on Cancer and a “probable human carcinogen” by the Environmental Protection Agency:
"Formaldehyde, a colorless, pungent-smelling gas, can cause watery eyes, burning sensations in the eyes and throat, nausea, and difficulty in breathing in some humans exposed at elevated levels (above 0.1 parts per million). High concentrations may trigger attacks in people with asthma. There is evidence that some people can develop a sensitivity to formaldehyde. It has also been shown to cause cancer in animals and may cause cancer in humans. Health effects include eye, nose, and throat irritation; wheezing and coughing; fatigue; skin rash; severe allergic reactions. May cause cancer." – EPA
Even if you’re using a Formaldehyde-free BKT solution, it is important to check the ingredients, as other toxic fumes may be released when combined with a hot flatiron.
One of the best precautionary measures you can take to help reduce exposure to formaldehyde fumes and other dangerous fumes is ventilation and purification.
Sentry Air System’s Model 300 BKT Fume Extractor will help capture toxic fumes while drawing them away from client’s and stylist’s respiratory zone. After passing through the unit’s filtration system, the air will be exhausted back into the room. This helps reduce fume exposure to the customer, the stylist, and other patrons in the salon.
This portable unit utilizes heavy-duty carbon filtration and features a self-supportive flex hose that the stylist can place in the most effective capture area. The base of the unit is equipped with wheels for easy maneuvering and placement.
Hazards of Formaldehyde/OSHA Regulations

For more information on these and other products call the number below.
**Please note that it is the individual's responsibility to use multiple safety controls while performing Brazilian Keratin Treatment. Sentry Air Systems and its equipment is not deemed a determining source of whether or not your facility or operation is “safe” or meets any federal, state, or any additional authority’s guidelines concerning formaldehyde control in correlation with Brazilian Keratin Treatment. According to the National Cancer Institute, Formaldehyde is a known human carcinogen and is associated with lung disease and other serious illnesses. It is the individual’s sole responsibility to confirm the suitability of the equipment for their particular application. Proper maintenance, which entails changing the carbon filter on a frequent basis, is essential to ensure the equipment is functioning correctly. There is no guarantee that containment with this system will be 100% effective. If you are allergic or sensitive to formaldehyde and/or other chemicals used in Brazilian Keratin Treatment, please consult a health professional.**