You can take electric powered hair curlers, they are not restricted, but hydrocarbon gas powered hair curlers are restricted.
All cylinders containing pressurised gas present a risk of exploding. It is not safe to take larger cylinders onto the plane.
You will be asked to relinquish all dangerous or prohibited items found in your carry-on luggage. If you refuse:
AvSec x-ray bags going onto aircraft to ensure there is nothing dangerous in them. If something comes up on the x-ray that needs checking, the bag will be opened, searched and any dangerous good or prohibited item will be removed, with a bag search notification form left within the bag.