What is the typical water content in most foam mixes?

• A. 94 To 99.9 Percent Water
• B. 100 Percent Water
• C. 0 Percent Water
• D. 50 Percent Water

Answer: (A)

Foam solution is created by mixing a foam concentrate with a large amount of water, so the finished solution is predominantly water. The concentrate is only a small fraction—often on the order of 1% to 6% depending on the product—while the rest is water. That’s why the typical water content falls in a high range, about 94% to 99.9% water. Pure water isn’t typical because you need that small amount of concentrate to give the foam its spreading and film-forming properties. A 50/50 mix or 100% water would not provide the necessary foam characteristics.