Description 18″ 40th Birthday foil balloon. These number balloons are ideal for all those special ocassions especially for those birthday parties. Balloon Care Foil balloons are sensitive to extreme temperature changes. In cold air they may appear deflated. In warm air they usually expand. again. Extreme heat can cause the helium to expand and burst the balloon. Foil balloons may conduct electricity. Do not release helium filled foil balloons outdoors or use near overhead power lines. Use only non-metallic ribbon and attach the balloon to a weight to keep it from floating away. Inflate with helium, this balloon will float for 3 – 5 days and can be refilled. You should never deliberately inhale helium as it may cause you to asphyxiate leading to suffocation and serious harm. Please note images are for illustrative purposes only and actual products may vary. Please note helium cylinders, balloon ribbon and weights can be purchased seperately. Balloons are sold in packet, not inflated.
