Besides the grits and grades sandpaper is made out of materials that vary chemically.
What grade of sandpaper for hardwood floors.
Can take out the scratch from 120 grit or 100 grit sandpaper if necessary.
Be sure the paper is properly installed and be prepared to change it regularly.
It can be made from the grains of a natural mineral called garnet or from synthetic ones like aluminum oxide alumina zirconia or silicone.
Takes out 60 or 80 grit scratch.
This is usually the final grit for maple birch or other particularly hard woods and for any floor that you would like to stain.
As you begin sanding remember never to turn the sander on while the sandpaper and drum are touching the floor.
Use a coarse grade in the beginning unless the floor is in very good condition.
More facts on sandpaper types.
A higher number means a finer softer sandpaper grit.
Protect yourself from the dust by wearing a dust mask and safety goggles.
The lower the grade the rougher the sandpaper.
Sandpaper for power sanding is sold in.
Use it for extremely rough surfaces when wood has dips gouges.
A lower number means coarser and more abrasive.
Decide on the grade of sandpaper that you are going to need.
The heat will melt the old finish and this clogs the sandpaper.
Initial efforts in hardwood floor sanding.
For example 60 grit sandpaper is the roughest sandpaper typically used on wood.