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 02116, Paper Sheet 346U, 60 D-weight, 9 in x 11 in, 7000120221
$1.11
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 30709, Cloth Belt 577F, 120 YF-weight, 1/2 in x 12 in, Fabri-lok, Single-flex, 7010363107, 200 per case
3M 26120, PPS Series 2.0 Adapter, Type S28, 17.5 mm Female, 19 TPI
Thread, 7100135956
3M 34675, 641WY, 1" X 30", 400 Mesh, Diamond Cloth Belts, 7100111369
3M 81356, Venture Tape White Aluminum Foil Tape 1558HT, 72 mm a 45.7 m, 5.4 mil, 7010335933
3M 88901, PSA Cloth Disc 348D, P100 X-weight, 12 in x NH, Die 1200B, 7000118894
Dynabrade 11477 Dynabelter Abrasive Belt Tool, Heavy-Duty
Standard Abrasives 708751, PSA A/O Disc, 12 in x NH, 60, 7010370081 
