High expansion foam, since its expansion ratio being high and its density being low, will be blown off by air if we use it on the deck .
High expansion foam is used in engine room because the engine room being a closed compartment, the foam can completely fill the same
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Note: In cargo holds, usage of high / low expansion foam depends purely on the type of cargo carried
The mixing ratio of foam can be of three types
- Low expansion ( mixing ratio – 20:1)
- Medium expansion (20:1 to 200:1)
- High expansion (200:1 to 1000:1)