Is 10.9 stronger than grade 8?

Could you please clarify for me, in the context of your question, what exactly are you referring to when you ask if "10.9" is stronger than "grade 8"? Are you referring to a specific material's hardness or strength rating, perhaps in a construction or engineering context? Or could this be related to some sort of grading system used in academia or industry? Without more context, it's difficult to give a definitive answer, as the meaning of "10.9" and "grade 8" can vary widely depending on the field and context in which they're used. Could you please provide some additional information to help me better understand your question?