Pumice Powder Media for Abrasive Blasting and Tumbling
Pumice is a natural mineral - volcanic ash formed by the solidification of lava that is permeated with gas bubbles. Pumice powder is used chiefly as an abrasive and is among the softest of all media. Use pumice powder for less aggressive operations where the protection of the surface is of supreme importance. Pumice is the best media choice for tumbling plastics.
FFF, 01/2 and 3 grades are most popular and are standard stock items.Typical Screen Analyses of Grades
US Standard Mesh |
Percentages on each Mesh - note T = Trace (less than 0.5 grams) Grades |
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|---|---|---|---|---|---|---|---|---|---|---|
| Size No | Inches Opening | Microns | FFFF | FFF | FF | 0 | 01/2 | 1/2 | 3 | 4 |
| 10 | 0.0787 | 2000 | ||||||||
| 14 | 0.0555 | 1400 | 1-40 | |||||||
| 20 | 0.0331 | 850 | 25-55 | |||||||
| 30 | 0.0234 | 600 | T-5 | 5-30 | ||||||
| 40 | 0.0165 | 425 | 20-60 | 5-30 | ||||||
| 50 | 0.0117 | 300 | T-10 | 40-60 | 1-20 | |||||
| 60 | 0.0098 | 250 | 1-10 | 10-30 | T-5 | |||||
| 80 | 0.0070 | 180 | T-5 | T-10 | 30-60 | 1-10 | ||||
| 100 | 0.0059 | 150 | T-5 | 1-10 | 20-35 | T-5 | ||||
| 120 | 0.0049 | 125 | 1-10 | 1-15 | 10-25 | |||||
| 140 | 0.0041 | 106 | 1-15 | 10-30 | 1-10 | |||||
| 170 | 0.0035 | 90 | T-10 | 1-15 | 10-30 | |||||
| 200 | 0.0029 | 75 | T | T-2 | 5-10 | 1-15 | 10-35 | |||
| 325 | 0.0017 | 45 | 10-20 | 10-25 | 10-25 | 10-25 | 20-40 | |||
| Pan | 80-90 | 75-90 | 70-80 | 40-70 | 1-10 | T-5 | T-10 | |||
| Totals | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | ||
| Oil Absorption (ASTM D281) |
Actual | 45 | 45 | 45 | 45 | 45 | 45 | 45 | N/A | |
| Saturation | 45 | 45 | 45 | 45 | 45 | 75 | 105 | N/A | ||
| Apparent Bulk Density lbs/ft³ poured loose and leveled per ASTM C29 as dry powder | 48 | 47 | 45 | 44 | 37 | 34 | 29 | 28 | ||
Actual Oil Absorption is the number of pounds of oil per 100 pounds of pumice to completely coat the particle surface. Saturation Oil Absorption is the number of pounds of oil per 100 pounds of pumice to completely fill the voids between particles. |
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Pumice blasting media is packaged in 50 lb, 25 lb, 10 lb, 5 lb, 3 lb & 1 lb packages.
























