Making AirCrete requires good quality foam. The best foam is long lasting and firm. If the foam dissolves too quickly the AirCrete will collapse. The density of the foam is also critical. If it is too light, with too much air, the AirCrete will collapse. Use a postal or kitchen scale to check the weight of your foam. It should weigh between 80 - 100 gr/lt or about 3 oz / qt.
Many commercial foaming agents are detergent based and they produce very similar foam as good quality dish detergent. We tested Seventh Generation Natural Dish Liquid, Dawn Ultra, Safeway Home and Axion dish detergents. Seventh Generation Natural Dish Liquid and Axion out performed the other dish detergents. Dilute the detergent 40 parts water to 1 part detergent (5 gallons water / 2 cups detergent).
Commercial protein based foaming agents produced slightly better quality foam then the detergents in our tests. Drexel Foam Concentrate works very well diluted 160/1 - 4 oz / 5 gallons water, but it is toxic so we no longer use it.
Here's a list of commercial foaming agents for making foamed concrete (AirCrete):