First respondersSensor Detects When Firefighters’ Protective Clothing No Longer Safe

Published 10 August 2021

Firefighters risk their lives battling blazes, and aging protective gear can put them at even greater risk. Textiles scientist works with industry to develop a faster, easier way to detect damage from heat, moisture and UV light.

Firefighters risk their lives battling blazes, and aging protective gear can put them at even greater risk. 

A University of Alberta researcher is working with industry to reduce that risk with a sensor that can detect the gradual breakdown in garments from exposure to heat, moisture and ultraviolet (UV) light. 

“These fibers age silently and lose their performance, so this sensor technology is a breakthrough in terms of safety for workers exposed to heat and flame,” said clothing and textiles scientist Patricia Dolez, the project’s lead researcher and an assistant professor in the U of A Faculty of Agricultural, Life & Environmental Sciences (ALES). 

Damage to the garments may not be visible to the naked eye before performance is reduced considerably, said Dolez, a researcher in the Department of Human Ecology

“Firefighters have no good way to know how safe their clothing really is—you can’t tell just by looking at it.”

Once fully developed, the sensor patch would provide a way to assess the garment without destructive testing—for example, having to cut out samples to test the fabric’s condition through conventional methods such as strength testing. 

Developed in partnership with Edmonton-based company Davey Textile Solutions and other industry partners, the sensor patch uses graphene, a flaky substance composed of carbon atoms, to form conductive tracks on the patch’s surface. When exposure to heat, moisture or UV light exceeds a certain level, the graphene track is disrupted and loses its electrical conductivity. 

Firefighters would use a simple voltmeter to check the safety levels of their clothing on the sensor patch—a result that comes within seconds.

The sensor has been provisionally patented and is still under development. It comes at an optimal time, Dolez said, as the National Fire Protection Association (NFPA) prepares to upgrade its recommendations on garment maintenance because of an underlying threat of diseases such as cancer, which can be caused by fire-associated harmful substances leaching into the fabric. 

“The current recommendation is to wash firefighting garments twice a year, but the problem is all the existing data that determines when the clothing needs to be replaced is based on that once- or twice-a-year washing,” she said.

New NFPA recommendations are expected to bump up the laundering frequency to after each exposure to a firefighting incident, which means the monitoring technology also needs to be amped up. “The sensor is important to be able to gauge what the garment is going through with each washing.”

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