Although alcohol-based hand sanitisers can help prevent the transmission of COVID-19, the liquid solutions – most of which contain isopropyl alcohol – are flammable and can cause burn injuries, the Mechanical Contractors Association of America is warning workers.
In a May 1 safety memo, the association describes an incident in which a worker suffered first- and second-degree burns to the hands after using an alcohol-based hand sanitiser and then touching a metal surface before the liquid evaporated. “Due to static electricity, the vapour from the hand sanitiser ignited with an almost invisible flame on both hands,” the memo states.
The Virginia Department of Labour and Industry issued a similar warning, saying workers should act with caution when using these products.
A best practice to protect employees from this hazard includes waiting to let the sanitiser fully absorb into the skin or evaporate prior to returning to work. Isopropyl alcohol is highly flammable and can easily ignite. Vapours may form explosive mixtures with air, travelling to a source of ignition and flash back. It is not really the liquid burning – it is the vapours that catch fire.
The Centers for Disease Control and Prevention recommends the use of hand sanitisers with at least 60% alcohol against SARS-CoV-2 – the coronavirus that causes COVID-19 – particularly on job sites where soap and water aren’t readily available. MCAA identifies construction worksites and mechanical service areas as high risk for burn injuries related to hand sanitisers.
Potential causes of ignition on a job site, Rose said, include:
Sparks from electrical tools and equipment
Sparks, arcs and hot metal surfaces from welding and cutting
Smoking tobacco products
Open flames from portable torches and heating units as well as boilers, pilot lights, ovens and driers
Sparks from grinding and crushing operations
Sparks caused by static electricity
“Isopropyl alcohol should be kept away from heat, sparks, flames and other sources of ignition, as well as strong oxidizers, acetaldehyde, chlorine, ethylene oxide, acids and isocyanates,” Rose said. “Isopropyl alcohol should be stored in a tightly closed container in a cool, dry, well-ventilated area. Hand sanitiser in quantities above 5 gallons should be stored in a flammable liquids cabinet or in areas protected by an automatic sprinkler system.”
June 10, 2020 - Safety & Health