Fire extinguishers were invented in the 1800s. The ones we use today are much different from the original extinguishers. Soda-acid extinguishers were phased out due to safety and maintenance concerns.
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Soda-acid fire extinguishers used a combination of baking soda and sulphuric acid as part of a chain reaction to force a high-pressure stream of water out of the extinguisher. The two were often mixed by turning the extinguisher upside down so that a plug blocking the sulphuric acid would drop out, letting the acid mix with the soda. Other models had a plunger you had to push down to open the acid container.
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Soda-acid extinguishers had an unfortunate tendency to explode. Their effectiveness and readiness for use also faded quite quickly, and finding maintenance and replacement parts became so difficult that by 1969, companies had stopped making the soda-acid extinguisher.
You might still see soda-acid extinguishers mentioned as suitable models for extinguishing Class A fires, or those involving materials like paper and wood. The Occupational Safety and Health Administration says these are old lists of what can be used, not necessarily what is approved for use.
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