Grinding wheel grade identification: Letters I to P on a wheel indicate it is of hard grade. Is this statement correct?

Introduction / Context:
Grinding wheel grade indicates the bond's holding strength of abrasive grains, not the abrasive hardness. Manufacturers encode grade with letters from “A” (very soft) to “Z” (very hard). Understanding this scale helps select a wheel that self-sharpens properly for the job.

Given Data / Assumptions:

• Letter range A–Z increases with grade hardness.
• Typical convention used in most standards.
• Statement claims I–P equals “hard grade”.

Concept / Approach:
Grades I through P correspond to roughly the medium range. Hard grades are typically toward the upper end (e.g., R, S, T … Z). Therefore, stating that I–P is “hard grade” is inaccurate; it is more appropriate to call it “medium”.

Step-by-Step Solution:

Verification / Alternative check:
Wheel markings (e.g., 38A 60 K 5 V) show K as a medium grade letter, reinforcing the mid-range classification.

Why Other Options Are Wrong:
“True” would mislead users into selecting a wheel that may not shed dull grains, causing glazing.

Common Pitfalls:
Confusing abrasive grit hardness with grade; grit hardness relates to abrasive type (Al2O3, SiC), while grade refers to bond holding strength.

Final Answer:
False