Oxygen Canister

what’s the difference between an oxygen canister and oxygen generating cylinder, as in qf30 vs value jet592?

i have read that the qantas flight 30 incident was the first aviation incident involving an oxygen canister or bottle. however, in 1996 in the US, valuejet flight 592 plunged into the everglades due to a fire caused by an oxygen generating cylinder. what’s the difference between these two oxygen tanks?
thanks to all of the answers so far, this is great information to me, i’m a bit of a commercial aircraft fan. how will i ever choose which one’s best?! lol….:)

A bottle holds pressurized gas, just as you would see a mechanic take an airbottle out to a car/plane/trailer and fill up the tire with compressed air.

The o2 generators utilize a chemical reaction that is initiated when the 3 chemicals are mixed… which occurs when you pull down on the mask. The resultant chemical reaction generates about 15-20 minutes of o2 for your mask. The problem with Valujet 592 was the generators when they fire off, exotherm up to around 500 degrees F and they were improperly rigged/packed/shipped… so the chain reaction created a fire that incredibly intense and brought down the aircraft.

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