Regarding the safety of 90%-98% HTP on the Bloodhound project, I am certain that with the expertise of that organization it will not be a problem.
The safety aspects of storage and handling HTP are well documented by the suppliers of HTP. BECCO Chemical Division of FMC Corporation in Buffalo, NY was a supplier of propellant grade HTP for many years. James C. McCormick published a number of reports concerning HTP and its uses.
Both 90% and 98% HTP are highly energetic oxidizers. I have, in the past, used both in various high performance rocket-propelled vehicles without any safety issues. Understanding the proper materials and handling techniques is essential, however.
Solvay Interox, FMC Corporation, and Degussa currently supply propellant (rocket) grade HTP and can supply safe handling documentation.
FMC had supplied HTP for years in 300-pound specially constructed aluminum drums without any major issues.
Rule number 1 - HTP continually decomposes, liberating gasses that will build up high pressures in confined spaces.
Rule number 2 - any contaminant in containers or plumbing systems will accelerate decomposition
Rule number 3 - HTP is a very strong oxidizer and will ignite, with gusto, organic materials (cotton clothing, grease, etc.)
Again, I have handled HTP in the field for many years at drag strips and other unsanitary venues without issues. Bloodhound will have no problems doing the same.
