EPG-J
Seven grades from 60# to a 300# micro powder, covering 0.20–1.02 mm nozzle bores and plate from over 80 mm down to under 6 mm. Each grade states the recommended bore and thickness band, so selection is a lookup, not trial and error.
| Grade | Mesh | D50 | Suggested bore | Plate thickness | Typical use |
|---|---|---|---|---|---|
| EPG-J-60 | 60# | ~250 μm | 0.76–1.02 mm | > 80 mm | Thick steel plate, concrete, castings (gate removal) |
| EPG-J-80 | 80# | ~180 μm | 0.76–1.02 mm | 30–80 mm | General purpose: carbon and stainless plate, stone |
| EPG-J-100 | 100# | ~150 μm | 0.60–0.90 mm | 15–50 mm | Transition grade for precision cutting, better edge than 80# |
| EPG-J-120 Legacy code EPG-J-1 | 120# | 115 μm class | 0.50–0.76 mm | 5–40 mm | Workhorse: stainless, aluminium, composites |
| EPG-J-140P Legacy code EPG-J-2 | 140# | 106 μm class | 0.40–0.65 mm | 3–25 mm | High-purity grade: rust-critical, medical and thin aerospace parts |
| EPG-J-200 Legacy code EPG-Z-1 | 150–200# | 75–90 μm class | 0.30–0.50 mm | 1–15 mm | Ultra-precision cutting, micro holes, thin-section finishing |
| EPG-W-63 | ~300# | 46.1 μm | 0.20–0.35 mm | < 6 mm | Micro powder: micro holes, electronics, optical deburring |
Grey rows are grades in production whose parameters we have not measured for publication — request the batch TDS and you get measured values.
EPG-W is the waterjet micro-powder sub-range. It carries its own prefix instead of EPG-J so it cannot be mistaken for a standard mesh grade at order entry. The 63 in EPG-W-63 is a legacy internal number, not 63 μm or 63 mesh — select on d50 46 μm.
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.
ENGINEERING NOTES
Coarser grains cut faster, at the cost of faster nozzle wear and a heavier trailback at the lower edge. 80# is the speed grade.
Finer mesh gives a smoother surface and less taper, but you pay for it in traverse speed. 140# / 200# are the quality grades.
Oversize grains and unsifted fines are what clog tubes and wear them out early. Double-sifting is a baseline here, not a selling point.
Fine mesh on thick plate pierces slowly with heavy back-spray; coarse mesh on thin plate wastes abrasive and roughens the edge. Grain size, bore and thickness have to line up.
| Cut level | Grade | Speed | Edge quality | Best for |
|---|---|---|---|---|
| Rough cut | EPG-J-60 / J-80 | Fastest | Visible striations and trailback, secondary machining required | Blanking, part separation |
| Low-medium | EPG-J-80 / J-100 | High | Light striations, acceptable for structural work | Structural parts, decorative blanks |
| Medium | EPG-J-100 / J-120 | Medium | Uniform surface, standard tolerance | Pre-machining blanks |
| High | EPG-J-120 / J-140P | Slow | Fine surface, near-vertical edges | Finished parts, precision thin sections |
| Highest | EPG-J-200 / W-63 | Slowest | Near-mirror, virtually striation-free | Sealing faces, visible surfaces |
ENGINEERING NOTES
| Orifice | Focusing tube ID | Abrasive feed | Pressure | Typical work |
|---|---|---|---|---|
| 0.010" / 0.25 mm | 0.030" / 0.76 mm | 0.2–0.3 kg/min | 3,000–4,000 bar | Thin sheet, glass, small features |
| 0.013" / 0.33 mm | 0.040" / 1.02 mm | 0.3–0.45 kg/min | 3,000–4,000 bar | General sheet metal and blanks |
| 0.014" / 0.36 mm | 0.040" / 1.02 mm | 0.35–0.5 kg/min | 3,000–4,000 bar | Medium plate, long runs |
| 0.016" / 0.41 mm | 0.045" / 1.14 mm | 0.45–0.7 kg/min | 3,500–4,100 bar | Heavy plate, castings |
Two rules worth more than the table: the largest grain should not exceed one third of the tube ID, and past the peak loading ratio extra abrasive only slows the cut. A tube erodes roughly 0.0025 mm of bore per hour, so 100–120 hours is a typical life. The figures above are OEM starting points — your machine builder’s table governs.
| Symptom | Likely cause | Check first |
|---|---|---|
| Periodic marks on the edge | Pulsating abrasive feed | Check for caked, moisture-affected abrasive at the hopper outlet; check the feed line for air ingress |
| Sudden drop in cutting speed | High fracture rate or mixed batch | Compare the current COA PSD; check whether the mixing tube is past its service life |
| Frequent tube clogging | Oversize grains | Confirm mesh-to-bore match; ask your supplier for the residue above 100 mesh |
| Longer piercing time | Mesh too fine or pump pressure low | Step up a grade against the thickness table; verify pump pressure and head squareness |
Typical application: Workhorse: stainless, aluminium, composites
| Garnet content | 92–96% |
|---|---|
| Free silica | < 3% |
| Total chlorides | ≤ 25 ppm |
| Conductivity | 25 μS/cm |
| Mohs hardness | 7.5–8.0 |
| Specific gravity | 3.96 |
| Bulk density | 2.2–2.4 g/cm³ |
| Radioactivity | 0.25 μSv/h |
| Mesh | μm | Cumulative passing |
|---|---|---|
| 100 | 180 | 0.00% |
| 120 | 125 | 33.75% |
| 140 | 106 | 66.68% |
| 170 | 75 | 89.90% |
| 220 | 63 | 91.83% |
| PAN | — | 100.00% |
Typical application: High-purity grade: rust-critical, medical and thin aerospace parts
| Garnet content | 95–98% |
|---|---|
| Free silica | < 2% |
| Total chlorides | ≤ 25 ppm |
| Conductivity | 25 μS/cm |
| Mohs hardness | 7.5–8.0 |
| Specific gravity | 3.96 |
| Bulk density | 2.2–2.4 g/cm³ |
| Radioactivity | 0.25 μSv/h |
| Mesh | μm | Cumulative passing |
|---|---|---|
| 100 | 180 | 0.00% |
| 120 | 125 | 18.20% |
| 140 | 106 | 76.10% |
| 170 | 75 | 87.10% |
| 220 | 63 | 91.90% |
| PAN | — | 100.00% |
Typical application: Ultra-precision cutting, micro holes, thin-section finishing
| 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 |
| Radioactivity | 0.25 μSv/h |
| Mesh | μm | Cumulative passing |
|---|---|---|
| 115 | 125 | 8.70% |
| 150 | 106 | 29.00% |
| 170 | 90 | 48.00% |
| 200 | 75 | 67.70% |
| 230 | 63 | 84.50% |
| 270 | 53 | 91.52% |
63 is a legacy number
Typical application: Micro powder: micro holes, electronics, optical deburring
| 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 |
| Radioactivity | 0.25 μSv/h |
| Percentile | μm |
|---|---|
| D10 | 29.28 |
| D25 | 36.26 |
| D50 | 46.12 |
| D75 | 58.44 |
| D90 | 72.14 |
| D97 | 87.70 |
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 / quoteTogether they cover most industrial plate from 3 to 40 mm and sit in the best balance of nozzle life against cutting speed. If your work spans grades, start at 140# and move up or down against the edge requirement.
A mesh number only tells you the sieve cut. It says nothing about the distribution inside that cut, the grain shape, or how much oversize survived screening — which is why two suppliers can both ship “80 mesh” and cut very differently.
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