We sell brand new uninflated balloons. The air pump pumps in air, which cannot make the balloons float. To make them float, you must inflate them with hydrogen/helium.
Aluminum foil balloons with a diameter of 18 inches or larger can float when inflated with hydrogen or helium, and they can usually stay aloft for 1-3 days.
Aluminum foil balloons are not recommended to be inflated with a powerful electric air pump.

The aluminum foil material has no shrinkage, and it is very important to control the amount of air when inflated. If it is inflated by human error and ruptures, it does not fall within the scope of quality, so it cannot be solved after-sales.

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Avoid direct exposure to wind, sunlight, high temperatures, sharp objects, and beating or squeezing. Properly controlling the air pressure and operating correctly will help extend the lifespan of your balloons.
Because gases expand when heated and contract when cooled, when the temperature rises, such as moving from indoor to outdoor in summer or from outdoor to a heated room in winter, it is necessary to release air from the balloon in time to prevent it from bursting.