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Old 06-14-2019, 06:50 PM
browningv308 browningv308 is offline
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Default Fire extinguisher in a hot car



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Black truck that sits almost every day in the hot sun during the summer windows rolled up, will it explode? Also in same truck sitting outside all winter, will it freeze. This is the chemical kind advertised for gasoline fires, not sure if it's liquid foam or powder.
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Old 06-14-2019, 07:01 PM
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Good to go - we kept them in each vehicle in 125 deg F weather in Africa .

I wondered the same - will it explode in that heat? Nope.
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Old 06-14-2019, 07:02 PM
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Our work trucks have chemical type fire extinguishers in them. They are always parked outside, whether July sun or January ice. Granted, this is the Southeast, so while July can be 90-100F, winter usually only gets down around 30-40F, with a couple of weeks in the 20s. Occasionally a day or two in the teens.

I'd still Google your extinguishers make and model and find more info to be sure.
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Old 06-14-2019, 07:43 PM
neiowa neiowa is offline
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NO. Fire extingusher required 5yr hydrotest is to ensure the integrity of the cylinder.
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Old 06-14-2019, 07:43 PM
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I think what you need to be more concerned with is making sure it stays charged and the needle stays in the green zone on your gauge. The heat won't bother it.
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Old 06-14-2019, 08:06 PM
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As others have said, not a problem. They are designed with this in mind.
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Old 06-14-2019, 10:52 PM
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Kept one next to a 600 degree oven for years. Would be a 100 degrees for 12 hours a day every day at the distance from the stove. Just check it monthly to ensure its in the green.
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Old 06-15-2019, 12:52 AM
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I had one of those disposable Halon types in my big E350 van for a few years, when I went to remove it I found it had a leaked out.

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Old 06-15-2019, 11:11 AM
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The standard fire extinguishers in non emergency vehicles are dry chemical ( Iíve only seen a few exception with clean agent on some vehicles filled with electronics ( ie satellite uplink trucks), and CO2 or water on work trucks in arid areas, where welding or grinding might start a fire. Hay bailers and sometimes truckers use water also.

Dry chem extinguishers are pressurized with nitrogen, which follows the ideal gas law roughly. In other words, pressure is proportional to absolute temp. Since absolute zero is about -460 degrees F a fire extinguisher heated from 80 degF to say 150 degF sees on a 13% increase in pressure. The cylinders are designed for at least double the rated pressure, and are hydro tested at at least 125% of the rated pressure.
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Old 06-15-2019, 11:38 AM
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I keep one in my company work truck. Check it every Monday. Has never lost charge in cold or heat in three years. Inspection by fire extinguisher company every May. Need to go check the one in my camper right now. The wife will be cooking on the coleman stove tonight. Thanks for the reminder.


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