EPG-B-150
Typical application: Ultra-fine finish, matte on precision parts, aerospace surface prep
| Garnet content | 98% |
|---|---|
| Free silica | < 2% |
| Total chlorides | ≤ 3 ppm |
| Conductivity | 100 μS/cm |
| Mohs hardness | 7.5–8.0 |
| Specific gravity | 4.0 |
| Bulk density | 2.2 g/cm³ |
EPG-B
Five grades from 30/36# to 150–200#. Selection runs backwards from the acceptance criteria: fix the cleanliness grade and the target profile Rz first, then choose the mesh. The other way round, rework is waiting for you.
| Grade | Mesh | D50 | Achievable Rz | Typical use |
|---|
Grey rows are grades in production whose parameters we have not measured for publication — request the batch TDS and you get measured values.
Every figure on this page comes from the COA and TDS shipped with the goods. Grades that are not measured are listed by code only.
| Grade | Meaning | Typical Rz | Where it is specified |
|---|---|---|---|
| Sa 1 | Light blast | 15–35 μm | Secondary structures, non-coated surfaces |
| Sa 2 | Thorough blast | 30–55 μm | General industrial coating |
| Sa 2½ | Very thorough, near-white | 40–75 μm | Heavy-duty, offshore, tank interiors |
| Sa 3 | White metal | 60–100 μm | High-performance coatings, before passivation |
ENGINEERING NOTES
| Parameter | Usual starting point | Note |
|---|---|---|
| Nozzle pressure | 6.9–8.3 bar (100–120 psi) | Drop to 4–5 bar for thin or sensitive substrates |
| Blast angle | 75–90° | A shallower angle cuts faster but drives abrasive into the substrate |
| Stand-off | 300–500 mm | Too close gives an uneven profile, too far kills productivity |
| Consumption | 7–15 kg/m² (1.5–3.0 lb/ft²) | Varies with coating thickness, rust grade and recovery rate |
| Coverage | 100%, two crossing passes | Accept against the Sa grade, not the number of passes |
Coarser is not better. Where dry-film thickness is too low, profile peaks stand proud of the coating and the first rust spots start there. The working rule is a DFT at least three times the Rz — that is the real constraint behind "which mesh".
| Aspect | EPOWDER® garnet | Copper slag / coal slag | Silica sand |
|---|---|---|---|
| Free silica | < 2% | depends on slag source | high — crystalline silica is a regulated occupational-health hazard |
| Dust generation | low, dense grains | moderate to high | high |
| Soluble salts | tested per batch to ASTM D4940 | typically higher | typically lower |
| Reuse cycles | 6–8 (depending on recovery and dedusting) | 2–4 | single use |
| Magnetic separation | high SG separates cleanly from steel debris | moderate | — |
Garnet is tough and stays angular after fracturing; typically 6–8 reuse cycles depending on blast pressure, recovery method and dust extraction. Aggressive recovery and poor dedusting cut that number quickly — and because soluble salts accumulate over cycles, chlorides and free silica are controlled batch by batch.
ACCEPTANCE
| Standard | Requirement | Note |
|---|---|---|
| ISO 8501-1 | Sa 2.5 – Sa 3 | Up to Sa 3 (white metal), the highest grade |
| NORSOK M-501 / ISO 8502-6 | < 20 mg/m² | Mandatory for offshore and bridge projects |
| ASTM D4940 | ≤ 100 μS/cm by grade (≤ 90 by agreement) | Industry threshold is 90. Standard grades ship to ≤100 by contract; NORSOK and offshore orders can specify ≤90. Each COA states the measured value rather than the threshold. |
| ISO 8502-3 | ≤ class 2 | Tape method; backed by free silica <2% |
| ISO 11126 / 11127 | Non-metallic blast abrasive | Product standard for non-metallic blast-cleaning abrasives; use it to cross-check batch consistency at acceptance. |
Typical application: Ultra-fine finish, matte on precision parts, aerospace surface prep
| Garnet content | 98% |
|---|---|
| Free silica | < 2% |
| Total chlorides | ≤ 3 ppm |
| Conductivity | 100 μS/cm |
| Mohs hardness | 7.5–8.0 |
| Specific gravity | 4.0 |
| Bulk density | 2.2 g/cm³ |
These grades are in production, but we do not publish numbers we have not measured. Request the TDS and you get the real batch data.
The batch TDS and COA come back within 24–48 hours. Standard-grade samples ship in 3–5 working days; minimum one pallet.
Request TDS / quoteThe scenario that hurts: this batch profiles differently from the last, so the same coating parameters no longer achieve adhesion. That is why batch-to-batch PSD variation is written into our specification instead of a single mesh number. Tonnage figures look alike everywhere; batch consistency is where suppliers separate.
Coating adhesion depends on two things the abrasive controls: cleanliness and profile. They are set by different parts of the specification, and pushing one usually costs you the other.
Read the note →Material, machine, target result: three lines are enough. Grade recommendation within 48 hours; standard grades in stock, samples in 3–5 working days.
Get a grade recommendation peter@ef-global.cn