Convolute abrasive wheel and method of making

A method of making a convolute abrasive wheel comprising the steps of:

• applying a make coat to a first major surface of a nonwoven web, wherein the nonwoven web comprises a plurality of fibers, and further wherein the step of applying the make coat to the first major surface of the nonwoven web includes the make coat coating at least some of the fibers;
• applying abrasive particles to the make coat, the abrasive particles comprising a Vickers indentation hardness of at least 16 Gpa and a toughness of at least 3.0 Mpa m1/2;
• applying a first size coat comprising a phenolic resin over the make coat and abrasive particles;
• partially curing at least the first size coat to make a nonwoven abrasive web;
• applying a second size coat comprising a polyurethane prepolymer resin over the cured first size coat;
• spirally winding the nonwoven abrasive web with the second size coat into a roll;
• and
• curing the first size coat and the second size coat to form the convolute abrasive wheel.