General rule of thumb:
Heavy duty (8+ hrs/day, abrasive materials like quartz sand): 1–3 months
Medium duty (4–6 hrs/day, standard mortar): 3–6 months
Light duty (2–3 hrs/day, light materials like putty): 6–12 months
Key Factors Affecting Service Life
Material abrasiveness
High (quartz, emery): 1–2 months
Medium (ordinary mortar): 3–6 months
Low (gypsum, putty): 6–12 months
Blade material
Carbon steel: 1–3 months
High‑manganese steel: 3–6 months
Wear‑resistant alloy: 6–12 months
Operating hours
Continuous (8+ hrs/day): ~100–300 hours
Intermittent: ~300–500 hours
When to Replace (Visual & Operational Checks)
Blade edge worn to <1/3 original thickness
Obvious notches, curling, or deformation
Mixing uniformity declines; more lumps
Increased vibration or noise during operation