Researchers have discovered that many smartwatches and fitness tracker bands contain synthetic rubber made with PFAS (per- and polyfluoroalkyl substances), commonly referred to as “forever chemicals.” These chemicals are of concern because they are persistent in both the environment and the human body, and they can potentially be absorbed through the skin. A study conducted by the University of Notre Dame tested 22 different bands available for purchase in the U.S., revealing alarming levels of these chemicals in the products.
High Concentrations in Expensive Bands
The study revealed that the most expensive bands, those priced over $15, contained the highest concentrations of PFAS. Some of the tested bands contained PFHxA, a specific type of PFAS, at levels exceeding 1,000 parts per billion. This concentration is notably higher than what is typically found in other consumer products, making these bands a significant source of concern regarding chemical exposure.
The PFAS chemicals in these bands are linked to a synthetic polymer called fluoroelastomer, which is used to make the bands resistant to sweat and oil. While this material enhances the durability and functionality of the bands, it also raises health concerns. Fluoroelastomer is the key ingredient that allows these bands to be sweat- and oil-resistant, a quality desirable for those engaging in physical activities.
Fluorine Concentrations and PFAS Exposure
The study found that 15 out of the 22 tested bands contained high fluorine concentrations, a marker of PFAS presence. Of these, 9 bands were identified as containing PFHxA, a type of PFAS that has been linked to adverse health effects. Researchers are particularly concerned because sweat, often produced during exercise, can increase the rate at which these chemicals are absorbed through the skin, leading to higher exposure levels.
Exposure to PFAS has been associated with several serious health issues, including an increased risk of cancer, childhood obesity, metabolic disruptions, and weakened immune systems. The National Institute of Environmental Health Sciences has highlighted these risks, especially as research suggests that up to 60% of PFAS may be absorbed through the skin. Given the common use of fitness trackers and smartwatches during physical activities, this poses a significant concern for users.