Newspaper, A4 paper, office paper, and cardboard boxes (shoe and supermarket boxes) will decompose and release acidic vapors over the years? If I store an electronic device inside such a box with these papers, will it release acidic vapors and corrode the electronic boards and metal connections of the device? If the cardboard box and these papers come into physical contact with any electronic part of the device, will they corrode it because they contain acid in their composition?

1 hour ago, aranbadan said:

will decompose and release acidic vapors over the years? If I store an electronic device inside such a box with these papers, will it release acidic vapors and corrode the electronic boards and metal connections of the device? If the cardboard box and these papers come into physical contact with any electronic part of the device, will they corrode it because they contain acid in their composition?

Not a problem. The acidity of such wood pulp processing is low, and is only a residue sufficient to oxidize the paper/cardboard very slowly. That said, it never hurts to just put the electronics in a plastic sealed bag. This reduces dust, invasive humidity and/or urban air pollutants.

what acid type used in this material mentioned? and vapor generates?

When you buy pc components, they often come in gaseously-impervious, metallized plastic bags. That's what you need for archival storage.

1 hour ago, aranbadan said:

what acid type used in this material mentioned? and vapor generates?

Formic, acetic, sulphuric, sulphurous, nitric, and others. The only paper material I now that is finished acid-free are museum-quality art papers, boards, and probably boxes,

Edited December 7Dec 7 by StringJunky