Now with more explosions

Volatile chemicals now have a chance to self-ignite if stored above safe temperatures or let deteriorate to 20% and below. Maximum safe temperature currently is 45°C. While they can be stored at 1 or 2 degrees above this for extended periods of time, perhaps even days, 3 degrees too much will ignite them rather quickly. Exponential growth, yay! This is governed by RNG, so even a single degree can make the canister go boom with an unlucky draw.

Similarly they don't just ignite when arriving at 4 durability points (20% of 20). They have a 75% chance to do so every time they deteriorate. So there's the slim chance of them just rotting away. Don't count on it though.