Those factors include but are not limited to the presence of moisture that degrades the ammonium nitrate, a source wishing to remain anonymous revealed to AP.
The exploding Takata airbags hurl shrapnel into drivers and passengers and have so far been responsible for 139 injuries globally and at least 10 deaths.
The results of the scientific investigation, initiated by 10 of Takata's customers, Toyota, BMW, Fiat Chrysler, Ford, General Motors, Honda, Mazda, Mitsubishi, Nissan and Subaru, will be revealed this week. The investigation was done in February, 2015, by Orbital ATK, a Virginia-based rocket science company that makes rocket propulsion systems, small arms ammunition, warhead fuses and missile controls.
David Kelly, a former acting administrator of the National Highway Traffic Safety Administration, was appointed as project manager for the investigation by the automakers.
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According to analysists, some 50 million or more Takata inflators remain to be recalled in US cars and trucks. Takata must prove to the National Highway Traffic Safety Administration that the inflators are safe or all of them will be recalled starting in 2018, AP reports.
According to a report by CNN, engineers at Takata first noticed problems with the chemical mix used in its airbags over a decade ago. The problem has to do with aspirin-sized Ammonium nitrate tablets that are put in a metal canister inside the airbag, and are designed to produce a gas that inflates the bag. However, extreme temperature can destabilize the ammonium nitrate causing the metal canister to explode, according to patent application documents filed by Takata.