Proprietary Engineering Asset
Official BLAST APEX Anchor Pattern Guide for NACE/SSPC inspectors.
Download Field ReferenceMicron Profile Matrix (at 100 PSI)
| Abrasive Mesh | Almandine Garnet | Steel Grit (G40/50) | Aluminum Oxide |
|---|---|---|---|
| 16 - 20 Mesh | 100 - 125µm | 125 - 150µm | 110 - 140µm |
| 30 - 40 Mesh | 75 - 90µm | 90 - 110µm | 80 - 100µm |
| 30/60 Multi-Mesh | 50 - 75µm | 60 - 85µm | 55 - 80µm |
| 60 - 80 Mesh | 35 - 50µm | 40 - 60µm | 30 - 55µm |
| 100+ Mesh | 15 - 25µm | N/A | 10 - 30µm |
Profile Logic
Coarse mesh sizes (16-30) possess higher individual particle mass, creating deeper peaks and valleys for high-build marine coatings. Fine mesh (60-100) creates a dense, shallow profile ideal for thin-film precision coatings and restoration where finish quality is paramount.
Sector Requirements
- Shipyards: 75-100µm (30/60 Garnet)
- Refineries: 100µm+ (Coarse Steel Grit)
- Restoration: 25-40µm (Fine Alox/Bead)
Frequently Asked Questions
What mesh size abrasive produces Sa2.5 surface profile?
Sa2.5 (Near-White Metal, 45-75µm Rz): Use 16-40 mesh copper slag or 30-60 mesh almandine garnet at 6-8 bar. This mesh range provides the optimal balance between particle mass and particle count for consistent, uniform coverage. Finer mesh (60-100) produces shallow profile (25-45µm Rz) — acceptable for thin-film coatings but below Sa2.5 standard.
What is the difference between mesh size and profile depth?
Mesh size = particle diameter classification (mesh count = openings per linear inch of sieve). Profile depth (Rz/Ra) = surface roughness measurement after blasting. Coarser mesh = larger particles = deeper profile, BUT profile also depends on: particle hardness, impact velocity, substrate hardness, and angle of blast.
Can I use the same abrasive mesh for both steel and concrete?
No. Steel requires angular particles for cutting action — copper slag, garnet, steel grit. Concrete requires less aggressive media — aluminum oxide or fine garnet (60-100 mesh) at lower pressure (2-4 bar). Using steel-blasting media on concrete causes substrate damage and excessive dust.