Sorry Albert, no clue as to the breakdown/interaction characteristics of Sodium Azide... or, for that matter, whether MB even uses it... many car companies do. My comments were meant to be general.
If your air bag covers are broken open, why not put your mind at ease and replace them?
Personally, I would replace any part of the car's restraint system that I suspected of being faulty.
KenP

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KenP

1996 S500 W140 Coupe