Patent ID: 7422513

Claim:
A bonded abrasive tool, having a structure permeable to fluid flow, the tool comprising: a) about 34-56 volume % non-elongated abrasive grain; b) about 3-25 volume % bond; and c) about 35-80 volume % total porosity, including at least 30 volume % interconnected porosity, wherein pores included in the total porosity are irregularly and randomly shaped and sized; the bonded abrasive tool being substantially free of porosity inducing media and elongated shaped materials having a length to cross-sectional width aspect ratio of at least 5:1; wherein 5-100 volume % of the abrasive grain comprises abrasive grain held within sintered agglomerates, and the sintered agglomerates comprise a plurality of abrasive grains with a binding material, and the sintered agglomerates have an average diameter that is no greater than an average dimension of the interconnected porosity when the interconnected porosity is measured at a point of a maximum opening.