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Blasting Media

Pumice

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
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
Oil Absorption (ASTM D281)		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.

Packaged in 50, 45 or 60 lb boxes (depending on grit size).

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