Epoxy resin composition particle, tablet, and method for producing columnar tablet

An epoxy resin composition particle used for magnet fixing, the epoxy resin composition particle comprising:

• an epoxy resin;
• and
• a fibrous or acicular filler,
• wherein a fracture toughness value (KIc) measured by the following procedure i is equal to or more than 3.0 MPa·m1/2,
• (procedure i)
• using a transfer molding machine, a molded body is molded from the epoxy resin composition particles under molding conditions of a mold temperature of 175° C., an injection pressure of 9.8 MPa, and a curing time of 120 seconds,
• according to a KIc method standardized in ASTM D5045-14, the obtained molded body is adjusted to a size of a length of 50 mm, a width B of 5 mm, and a thickness W of 10 mm, a notch having a depth of 3.5 mm in a thickness direction is formed in a central part in a length direction, and the obtained molded body is cured at 175° C. for 4 hours to obtain a cured product, a scratch having a depth of 0.1 mm in the thickness direction is made with a razor on a notch tip portion of the cured product, and a test piece having a total crack length a=3.6 mm is produced,
• subsequently, the obtained test piece is subjected to a three-point bending test using a tensile compression tester at a measurement temperature of 25° C., a speed of 10 mm/min, and a distance S between fulcrums of 40 mm, and a fracture toughness value (KIc (MPa·m1/2)) is calculated based on the following expression, and in the following expression, PQ is a maximum load (N):
• K
• ⁢
• I
• C
• =
• (
• (
• P
• Q
• ×
• S
• )
• /
• (
• B
• ×
• W
• 3
• /
• 2
• )
• )
• ×
• f
• ⁡
• (
• a
• /
• W
• )
• provided that f(a/W)=(3(a/W)1/2[1.99−(a/W)(1−a/W){2.15-3.9 (a/W)+2.7(a/W)2]})/(2{1+2(a/W)}{1−(a/W)}3/2).