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Heat Warning Stickers with Hydration reminder– Pack of 10
The heat warning sticker changes colour at temperatures of approximately 28 °C and above, revealing a warning message. As it cools down, it automatically returns to its original state and is ready for the next use.
Please avoid direct sunlight, as this may trigger the warning prematurely. During storage, keep the stickers flat under a weight, as the laminated material tends to curl. Do not bend the sticker when cold, as this may crack the black thermochromic coating.
Please avoid direct sunlight, as this may trigger the warning prematurely. During storage, keep the stickers flat under a weight, as the laminated material tends to curl. Do not bend the sticker when cold, as this may crack the black thermochromic coating.
Size: approximately 9 cm in diameter
One sticker – two states
The warning appears when it gets hot
In its normal state, the centre stays dark. When the temperature rises above approximately 28 °C, the display changes and the red warning text becomes visible. As the sticker cools down, it automatically returns to its original state, ready for the next temperature rise.
Temperature animation
Animated temperature cycle
The thermometer shows temperatures from 22 °C to 31 °C. The sticker changes accordingly but is not connected to the thermometer.
Current temperature 22 °C
Sticker response
How the warning appears
From approximately 28 °C, the red warning becomes visible. As the sticker cools down, the centre automatically turns dark again.
Warning fromapprox. 28 °C
Initial state
Centre stays dark
Below the activation temperature, the centre stays dark. The warning only becomes visible as the temperature rises.
This product is compatible with (for example):
This product was added to our catalog on Tuesday, September 1, 2026.