Treating

Protecting OSB from fungal or insect attack

We recommend a 3-minute dip cycle with a solvent-based system
An adequate amount of preservative will be absorbed in this way
Avoid double-vacuum systems and water-based chemicals, as these can cause damage

OSB and fire retardants

Some fire retardant impregnation systems use double-vacuum and water-based systems
For safety, always get the structural performance characteristics from the treatment company and follow their recommendations
Alternatively, use fire retardant paints and finishes as these can be used on OSB