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The main source of this kind of insulation is  : sorted newsprint is shredded and  and  agents such as boric acid are added. Cellulose is used either as  or as  .

Cellulose can also be used for  insulation. The manufacturer's instructions must be complied with. After use, cellulose can be  . Because it contains boric acid, it must not be disposed of at a  .

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