Glass filler and method for producing the same, and resin composition including glass filler

A glass filler comprising a glass composition,

• the glass filler being in a form of at least one selected from the group consisting of a glass flake, a chopped strand, a glass powder, a glass bead, and a flaky glass, wherein
• the glass composition comprises, in wt %:
• 53≤SiO2≤58;
• 26≤B2O3≤29.9;
• 7.5≤Al2O3≤18;
• 0≤CaO≤3.5;
• 0≤ZnO≤1;
• and
• 0.01≤T-Fe2O3≤0.5,
• where T-Fe2O3 is total iron oxide calculated as Fe2O3 in the glass composition, wherein
• the glass composition satisfies, in wt %, SiO2+B2O3≥80,
• wherein
• a permittivity at a frequency of 1 GHz is 4.4 or less,
• a dielectric loss tangent at a frequency of 1 GHz is 0.007 or less, and
• a temperature T2 at which a viscosity is 102 dPas is 1700° C. or less.

A glass filler comprising a glass composition, the glass filler being in a form of at least one selected from the group consisting of a glass flake, a chopped strand, a glass powder, a glass bead, and a flaky glass, wherein

• the glass composition comprises, in wt %:
• 53≤SiO2≤58;
• 26≤B2O3≤29.9;
• 10≤Al2O3<15;
• 0≤CaO≤3.5;
• 0≤ZnO≤1;
• and
• 0.01≤T-Fe2O3≤0.5,
• wherein
• the glass composition satisfies:
• SiO2+B2O3≥82;
• SiO2+B2O3+Al2O3≤98;
• 0<R2O≤5;
• and
• 0<RO<15,
• where R2O is at least one oxide selected from Li2O, Na2O, and K2O;
• RO is at least one oxide selected from MgO, CaO, and SrO;
• and T-Fe2O3 is total iron oxide calculated as Fe2O3 in the glass composition.