A recent study has found that smartwatch straps from many popular brands contain high concentrations of toxic chemicals called PFAS.
These chemicals, known as “forever chemicals,” do not break down easily in the environment and can accumulate in the human body over time. PFAS are commonly used in many consumer products such as nonstick cookware, waterproof clothing, carpets, mattresses, and food wraps.
The strap is made from a fluoroelastomer material that is quite popular among major smartwatch manufacturers.
Exposure to PFAS can cause a number of serious health problems, including increased risk of certain cancers, hormone disruption, weakened immune systems, and developmental delays in children. These chemicals can leach into water, soil, and food, creating a growing public health concern globally.
A study published in the journal Environmental Science & Technology Letters found that smartwatch bands made from fluoroelastomers contained high concentrations of perfluorohexanoic acid (PFHxA). The researchers analyzed 22 bands from a range of brands and price points, and the chemical was easily extracted from their surfaces. Notably, most of the bands containing PFHxA were marketed for sports and fitness purposes, meaning users may be exposed to more of the chemical during exercise.
Graham F. Peaslee, a physicist at the University of Notre Dame and lead author of the study, said the team had not been looking for PFAS until they saw an ad for a fluoroelastomer strap. When they analyzed it, they were surprised to find much higher concentrations of PFHxA than would be typically found in consumer products.
The advantage of fluoroelastomer straps is their water and sweat resistance.
Notably, several major smartwatch manufacturers, including Apple, Huawei, Samsung , and Google, have offered fluoroelastomer straps, citing durability concerns. While the extent of potential health risks from these chemicals remains unclear, the researchers urge the scientific community to continue investigating.
While waiting for the results of the study, experts recommend that consumers switch to watch straps made from non-fluoroelastomer alternatives. Most brands publicly disclose the material of their straps on their websites, making it easy for consumers to check before buying. However, fluoroelastomer straps are often designed to be water and sweat resistant, which can make it difficult for some users to find suitable alternatives.
