Understanding heat stress and its risks
Heat stress refers to the demand placed on the body when it’s exposed to high temperatures, often combined with high humidity and intense physical effort.
Many industries are affected: industry, metallurgy, foundry work, mining, nuclear power, wind power, electricity grid operation… as well as any outdoor work during heatwaves.
The effects of heat are varied: fatigue, heavy sweating, headaches, nausea, cramps, dizziness…
These symptoms, often downplayed, can signal serious conditions such as dehydration or heat stroke—a medical emergency that can cause loss of consciousness and, in 15 to 25 % of cases, death (according to the INRS).
Besides physiological impacts, heat reduces alertness, lengthens reaction times and impairs fine motor skills, thus increasing the risk of workplace accidents.
Aware of these issues, authorities are tightening regulations: in France, the decree of 27 May 2025 now requires employers to systematically assess the risks related to intense heat episodes and implement appropriate measures (work‑organisation, extra breaks, provision of drinking water, etc.).
PENTA Electrical Safety Products: practical solutions against heat
At PENTA Electrical Safety Products, we understand that protecting workers isn’t merely fulfilling a legal duty – it’s about preserving their health, performance and wellbeing.
Here are the best practices to adopt to minimise heat stress:
• Adjust work hours: it’s preferable to operate during the cooler parts of the day.
• Increase break frequency and encourage hydration: according to the INRS, it’s recommended to drink between 0.5 L/h and 1 L/h.
• Provide shaded or ventilated areas: workplace layout adjustments are required for team safety.
• Supply suitable equipment that maintains comfort and reduces heat stress.
Our teams offer innovative equipment to combat heat-related risks, designed to integrate into the most demanding industrial environments.
These solutions don’t replace organisational measures, but effectively complement them by providing a direct response to thermal strain.
Spotlight on the CryoVest®: technology working for safety
The CryoVest® is a thermoregulating vest designed to effectively shield workers exposed to extreme temperatures (above 50 °C).
Tested and certified under real field conditions at ArcelorMittal, this vest has shown its capacity to reduce cardiovascular strain, delay dehydration, improve thermal comfort and protect memory, attention and coordination.
Consequently, the CryoVest® becomes an essential prevention tool against heat stress.
From a physiological standpoint, it helps stabilise heart rate, limit sweating and maintain body hydration levels.
The benefits are significant in terms of thermal comfort, recovery after exertion and preservation of cognitive functions, thereby lowering the incidence of errors and exposure to heat‑related accident risks.
It’s easy to use: the packs, once frozen, are inserted into secured Velcro pockets.
The vest fits easily thanks to elastic straps.
Fully washable, it withstands many usage cycles; the packs may be reused up to 60 times.
Interested in learning more? See the CryoVest® product sheet.
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