Table 2.

BG composition ranges (wt %). Data reported are related to melt-derived BGs. Data from [42].

	Class A Bioactivity (wt %)	Class B Bioactivity (wt %)
SiO2	42–50	52–58
Na2O	14–28	3–20
CaO	12–26	8–20
P2O5	3–9	3–12
Al2O3	0–1	0–3
MgO	0–3	0–12
K2O	0–6	0–12
CaF2	0–12	0–18