Aluminum oxide is a very hard mineral that maintains sharp points on the grains much longer than natural abrasives such as emery or garnet. The abrasive grains are adhered to the sandpaper with some space between them, known as open-coat construction, to minimize the buildup of dust on the surface of the paper, which would otherwise load the abrasive points. Loading often results from sanding soft materials and can clog the abrasive, shortening the usable life of the sandpaper sheet.
3M 02145, Paper Sheet 346U, 80 D-weight, 3 in x 8 in, 7010359609
$0.36
Factory Stock, 7-10 Day Leadtime
3M Paper Sheet 346U is constructed of aluminum oxide and comes in a range of grades and sizes to accommodate many different projects. The paper backing is durable for coarse sanding, yet flexible enough to be used on curved surfaces. Its cut-rate and durability make this an excellent choice for blending the joints of connecting pieces in wood- and metal-working.

3M 45714, Cubitron II Hookit Cloth Disc 947A, 120+ X-weight, 3 in x NH, D/F 3HL, Die 300BE, 7100113113
3M 22394, Roloc Disc 361F, 50 YF-weight, TR, 3 in, Die R300V, 7000045096
3M 86992, Diamond Disc, 3" Roloc, 674W, 120 Mesh, TR, 7100143477, Box of 5
3M 01335, PSA Cloth Disc 348D, 40 X-weight, 3 in x NH, Die 300V, 7000118878
3M 45710, Cubitron II Hookit Cloth Disc 947A, 120+ X-weight, 6 in x NH, Die 600Z, 7100113139
3M 15289, 663FC, 2-3/4" X 160", 40u, Diamond Trizact Belts 7010508900
3M 21543, Scotch-Brite Roloc Clean and Strip XT Pro Extra Cut Disc, TR, 2 in x NH, A XCS, 7100179815, 60/box
Dynabrade 14010 Dynafile Abrasive Belt Tool Versatility Kit
3M 05741, Hookit Hand Block, 2-3/4 in x 7-3/4 in, 7000045716
3M 26103, PPS Series 2.0 Adapter, Type S19, 3/8 Female, 19 Thread BSP, 7100135928
3M 05530, Stikit Soft Hand Pad, 2-3/4 in x 5-1/2 in x 3/8 in, 7000028351
Dynabrade 13509 Dynastraight Finishing Tool, Rear Exhaust, 6,000 RPM, 5/8" (16 mm) or 1" (25 mm) Dia. Arbor
3M 26137, PPS Series 2.0 Adapter, Type S41, Trapezoidal Thread - QCC, 7100135947
3M 45708, Cubitron II Hookit Cloth Disc 947A, 60+ X-weight, 6 in x NH, Die 600Z, 7100113142
ACS Diamond Cloth Belt, CX1250 3" X 30" 45U
Standard Abrasives 713638, Cartridge RoII Mandrel, 3/32 in x 3/4 in x 1/8 in x 1 in x 2-3/4 in CM-2B, 7010294964
3M 77559, Cubitron II Hookit Cloth Disc 784F, 77559, 36+ to 120+, 5 in x NH, Die 500X, 7100232738 
