ISO 8501 defines four preparation grades: SA 1, SA 2, SA 2.5, and SA 3.
## SA 2.5 — Industry Standard
Most common grade. Surface free from visible oil, grease, mill scale, rust. Remaining traces only as slight stains.
## SA 3.0 — Highest Grade
Surface free from ALL visible contamination, uniform metallic color. Significantly higher cost.
Industry Standards7 min read2025-04-28
Surface Preparation Standards: SA 2.5 vs SA 3.0 Explained
A comprehensive guide to ISO 8501 surface preparation grades. Learn when to specify SA 2.5 vs SA 3.0 and how to verify results.
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