Borax is added to the papercrete recipe to prevent fire, mold, bacteria, and bugs.


According to 'slurryguy' from the papercreters yahoo group:

do not know of any scientific testing data to offer as a difinitive

Common practice among people using borax in papercrete has been to
add borax at a ratio of about 3% to 5% compared to the amount of dry
paper being used (by weight).

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