Shaped abrasive particles with low roundness factor

Shaped abrasive particles comprising alpha alumina, comprising a first face and a second face connected to each other by a sidewall, the first face and the second face being separated by a thickness t ranging between 25 micrometers to 500 micrometers;

• and a draft angle α between the second face and the sidewall, and having a cross-sectional shape along a longitudinal axis of the shaped abrasive particles, the cross-sectional shape comprising a polygonal cross-sectional plane, wherein the shaped abrasive particles comprise an Average Roundness Factor of between about 15% to 0%,
• wherein the Average Roundness Factor is determined by averaging the Roundness Factors of 10 individual shaped abrasive particles,
• wherein the Roundness Factor expressed as a percentage is calculated by dividing the Missing Area by the Actual Area and multiplying by 100, that is
• Roundness
• ⁢
• Factor
• ⁢
• %
• =
• Missing
• ⁢
• Area
• /
• Actual
• ⁢
• Area
• *
• 100
• ,
• wherein the Actual Area represents the cross-sectional plane of a transverse cut located as close as possible to the midpoint of the longitudinal axis of the shaped abrasive particle,
• wherein each face of sidewalls, first face and second face of the cross-sectional plane is bounded by a line drawn tangent to the two highest points located anywhere along that face, thereby enclosing a Maximum Area having a polygonal shape, and
• wherein the Missing Area represents the amount of area present due to rounded corners and uneven edges of the shaped abrasive particle, wherein the Actual Area of the cross-sectional plane is subtracted from the Maximum Area bounded by the polygon to determine the Missing Area,
• wherein Actual Area, Maximum Area and Missing Area are determined by the Roundness Factor Determination.