Raf posted two charts on that subject in some thread but these aren't working cuz raf's host isn't the same.I post them again.You can check concentration by density or boiling point.Maybe rhodium can put these charts on his web page.
https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000437657-file_k1ca.gif" title="View this image">
https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000437657-file_bslo.gif" title="View this image">
These charts and lot more info about H2O2 physical properties you can find here:

http://www.h2o2.com/intro/properties/physical.html

https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000437657-file_uun2.gif" title="View this image">

https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.bp-mp-conc.chart.gif

https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000437657-file_uun2.gif" title="View this image">

https://www.thevespiary.org/rhodium/Rhodium/chemistry/pictures/h2o2.density-conc.chart.gif

Keywords: Hydrogen Peroxide H2O2 Concentration Charts Density melting point boiling point correlation