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What is the range of medium expansion foam?

What is the range of medium expansion foam? Correct Answer 20 ∶ 1 to 200 ∶ 1

Explanation:

Foam:

  • A fire fighting foam is simply a stable mass of small air-filled bubbles, which have a lower density than oil, gasoline or water.
  • Foam is made up of three ingredients
    1. water
    2. foam concentrate
    3. air
  • When mixed in the correct  proportions, these three ingredients form a homogeneous foam blanket. 

Foam Solution:

  • This is a solution of water  and foam concentrate after they have been mixed together in the correct proportions. 

Foam Concentrate:

  • This liquid concentrate is supplied from the manufacturer which when mixed with water in the correct proportion forms a  foam solution.

Expansion rate:

  • Volume of finished foam divided by the volume of foam solution used to create the finished foam; i.e., a ratio of 5 to 1 would mean that one gallon of foam solution after aeration would fill an empty 5-gallon container with the expanded foam mass.
  1. Low expansion foam: Foam aerated to an expansion ratio of between 2 to 1 and 20 to 1.
  2. Medium expansion foam: Expansion ratio between 20 to 1 and 200 to 1.
  3. High expansion foam: Expansion ratio above 200 to 1.

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