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Prosecutors have since highlighted the role of the Korean company that made polyhexamethylene guanidine phosphate, or PHMG, the ingredient found to be toxic.

Most other airbag makers use guanidine nitrate, which is less volatile.

A small number of its inflater models contain a different compound, guanidine nitrate, and Takata said on Friday that it planned to expand production of those.

Takata will continue its air-bag operations by either offering air bags with inflaters made by other companies, or its own inflaters with a different type of propellant based on guanidine nitrate, Mr. Takada said.

But guanidine itself proved too toxic to humans, so chemists began to synthesize less toxic analogs known as biguanides, including metformin.