ASTTBC RFPT — Portable Fire Extinguishers (EX) · Question
When recharging a dry chemical extinguisher, which of the following is true regarding the use of different brands of dry chemical agents?
NFPA 10, Section 7.8.3.2 specifies that mixing different types or brands of dry chemical can lead to chemical reactions or result in poor discharge performance
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Question: When recharging a dry chemical extinguisher, which of the following is true regarding the use of different brands of dry chemical agents?
Answer options:
- Different brands can be mixed if they share the same base chemical (e.g., Monoammonium Phosphate). ✅ Mixing different brands of dry chemical is prohibited as it can cause a chemical reaction or change physical properties.
- Multi-purpose dry chemical can be mixed with regular dry chemical in BC provided the label is updated.
- Only chemicals from the same manufacturer and batch number are permitted for the life of the cylinder.
Correct answer: Mixing different brands of dry chemical is prohibited as it can cause a chemical reaction or change physical properties.
Explanation: NFPA 10, Section 7.8.3.2 specifies that mixing different types or brands of dry chemical can lead to chemical reactions or result in poor discharge performance due to different particle sizes or additives.
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