Which of the following statements about foam proportioning is MOST accurate?
A) Most Class A foams are mixed in proportions of 3 to 6 percent.
B) Most Class B foams are mixed in proportions of 1 percent or less.
C) Mixing Class A foam at a higher recommended percentage results in a thick, dry foam.
D) The percentage rate for proportioning foam is determined by the authority having jurisdiction.

Question

Quizplus · Accepted Answer

Class A foam, when mixed at higher than recommended percentages, tends to produce a thicker, drier foam. This is because the concentration of the foam solution increases, leading to a foam structure that is less fluid and more viscous, which is characteristic of a thick, dry foam.

Which of the Following Statements About Foam Proportioning Is MOST