Why AvSax fire containment bags?

Every passenger plane should have an AvSax fireproof bag on board to deal with overheating electronic devices


More than 15,373 AvSax fire containment bags are now on aircraft operated by 80 airline companies across the world ... and here's why.

On every flight there may well be hundreds of mobile phones, tablets and laptops all powered by rechargeable lithium-ion batteries … but there is always a possibility that poor quality or damaged batteries can overheat, causing the device to catch fire.

This is known as thermal runaway, a rapid, uncontrolled chemical reaction within the battery that causes the internal temperature to rise.

When one cell in a battery overheats it can produce enough heat - up to 900°C (1652°F) - to make adjacent cells to overheat. This can cause a lithium battery fire to flare repeatedly which is why AvSax fire and smoke mitigation bags are needed.

Federal Aviation Administration data in the USA reveals that in just nine years battery-powered devices were involved in 113 incidents with "smoke, fire, extreme heat or explosion" on passenger and cargo planes and people may well remember a spate involving Samsung Note 7 mobile phones which were recalled after it was discovered they had potentially faulty batteries.

The AvSax fire, smoke and heat mitigation and containment bags can minimise the danger in seconds. They have been deployed in action 32 times between January 2017 and July 2020. 

Simply pour at least two litres of water into an AvSax fireproof bag and then drop the overheating device into it. The water activates the polymer gel inside the bag causing it to expand around the device. Should the device keep on venting then the AvSax fire mitigation bag is tough enough to absorb the force.

In short, the AvSax cools the batteries in the device, reducing the likelihood of the battery catching fire but if it does go into thermal runaway it is all contained within the bag.

AvSax managing director Richard Bailey said: “AvSax is the result of many years of development, drawing on experience from the production of a similar device designed for military applications such as suppressing explosions.

 “Carrying an AvSax is a ‘one-size-fits-all', easy-to-use method of dealing with an incident involving a portable electronic device that has caught or is showing signs of catching fire in the cabin or on the flight deck.

“With so many poor quality and fake batteries around there’s no doubt that incidents will continue to happen.”


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