Abstract: Provided is a glass strand that, when mixed with mortar, is less likely to decrease the fluidity of the mortar and can 5 effectively increase the mechanical strength of a cementitious material. A glass strand includes: a plurality of glass filaments containing 12% by mass or more ZrO2 and 10% by mass or more R2O (where R represents at least one selected from Li, Na, and K); and a coating covering surfaces of the glass filaments, 10 wherein the coating contains polyvinyl acetate resin and polyether-based urethane resin, and wherein a content of the polyether-based urethane resin in the coating is, in solid content ratio, not less than 10% by mass and not more than 90% by mass.

Abstract: Provided is a glass strand that, when mixed with mortar, is less likely to decrease the fluidity of the mortar and can effectively increase the mechanical strength of a cementitious material. A glass strand includes: a plurality of glass filaments containing 12% by mass or more ZrO2 and 10% by mass or more R2O (where R represents at least one selected from Li, Na, and K); and a coating covering surfaces of the glass filaments, wherein the coating contains polyvinyl acetate resin and polyether-based urethane resin, and wherein a content of the polyether-based urethane resin in the coating is, in solid content ratio, not less than 10% by mass and not more than 90% by mass.

Abstract: The glass fiber of the present invention is formed of the glass composition including 50 to 60% SiO2, 0.1 to 10% Al2O3, 20 to 45% MgO+CaO+SrO+BaO, 0.5 to 20% TiO2, 0.1 to 10% ZrO2, and 0 to 2% Li2O+Na2O+K2O in terms of mol %, in which a BaO/CaO mol ratio is from 0.3 to 1.6.

Abstract: The glass fiber of the present invention is formed of the glass composition including 50 to 60% SiO2, 0.1 to 10% Al2O3, 20 to 45% MgO+CaO+SrO+BaO, 0.5 to 20% TiO2, 0.1 to 10% ZrO2, and 0 to 2% Li2O+Na2O+K20 in terms of mol %, in which a BaO/CaO mol ratio is from 0.3 to 1.6.