I've had anti-fire bottles in 2 cars, one of which had no tint and regularly got left in full perth summer sun. Nothing happened.
Considering that the anti-fire powder is stored at 1000kpa inside the bottle, the actual bottle itself is ridiculously strong. I imagine at some point it would explode if heated up enough, but nothings happend in either of my cars in over 3 years.
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