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AssigneeNitto Boseki Co., Ltd.
InventorsYosuke Nukui, Masaru Urushizaki
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A glass fiber including a plurality of flat-cross-section glass filaments each having a cross-section in flat shape, the cross-section having a major axis in the range of 15.0 to 25.0 μm, a minor axis in the range of 8.0 to 12.0 μm, and an irregular shape ratio R, being the ratio of the major axis to the minor axis (major axis/minor axis), in the range of 1.5 to 3.0. The flat-cross-section glass fiber has a packing rate P, being the ratio of the cross-sectional area of each flat-cross-section glass filament to the area of a rectangle circumscribing the cross-section of the flat-cross-section glass filament, in the range of 80.1 to 89.9%, and the irregular shape ratio R and the packing rate P satisfy the following formula (1): 337.6≤P3/2/R≤421.2 . . . (1).
Flat-cross-section glass fiber comprising a plurality of flat-cross-section glass filaments each having a cross-section in flat shape, the cross-section having a major axis in a range of 15.0 to 25.0 μm, a minor axis in a range of 8.0 to 12.0 μm, and an irregular shape ratio R, being a ratio of the major axis to the minor axis (major axis/minor axis), in a range of 1.5 to 3.0, wherein
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