No. of Glasses	Range of composition (percent)						Source
	SiO2	Na2O	K2O	CaO	MgO	Al2O3
Two-Component	Glasses:
3	79.4–64.8	20.6–35.2					[12]
3	84.3–66.3		15.7–33.7				[12]
Three·Component	Glasses:
6	80.7–64.4	4.6–31.3	3.8–14.3				[12]
7	77.2–61.5	14.2–24.7		3.8–14.3			[5]
8	79.1–62.6	15.0–27.8			3.1–11.7		[5]
4	72.5–65.0	19.8–24.5				5.1–10.2	[5]
Four Component	Glasses:
1	76.1	16.0		4.9	3.0		[5]
10	73.8–64.0	13.8–20.2		4.5–14.4		3.4–10.6	[5]
Five-Component	Glasses:
5	77.4–66.6	12.1–14.6	0.1– 4.4	10.2–12.1		0.2–7.2	[8]
4	70.2–67.5	11.9–15.3		9.8–13.3	0.6– 2.3	4.1– 7.3	[8]
1	69.2	12.7	8.7	9.6	1.7		[8]
Six-Component	asses:
20	72.0–59.5	10.5–15.0	0.1– 8.3	8.2–13.0	0.5–6.7	0.2– 6.7	[8]
Mean Composition (percent)	69.4	16.03	3.89	6.46	1.38	2.73
	Summary of Glasses Used to Calculate 700–1300 °c Factors of Table 1
Two-Component	Glasses:
12	80.0–66.2	20.0–33.8					[10,21]
5	76.1–63.4		23.9–36.6				[21]
Three-Component	Glasses:
2	72.0–70.1	26.8–21.1		6.8–8.8			[9, 29]
Four-Component	Glasses:
1	71.6	19.3		8.9		0.2	[9]
Five-Component	Glasses:
5	77.4–66.6	12.1–14.0	0.1– 4.4	10.2–12.1		0.2– 7.2	[8]
23	73.8–67.5	11.9–18.0		0.3–13.3	0.1–11.9	0.1–7.3	[8,11,30,31,32]
1	67.2	12.7	8.7	9.6	1.7		[8]
Six-Component	Glasses:
28	73.4–69.7	10.0–15.9	0.1– 8.3	5.9–13.0	0.5– 6.7	0.1– 6.7	[8,31,32]
Mean Composition (percent)	70.4	15.06	3.93	6.63	2.36	1.46
Other Glasses:			BaO
8	73.7–69.1	11.1–13.9	1.0– 5.0 B2O3   1.0– 5.0 Li2O  2.1–6.4 19.4–20.0   F2  1.1– 2.0	4.2– 7.2	2.9– 4.9	0.1– 0.2	[33]
16	74.0–68.6	10.7–16.0		2.9– 7.2	2.1– 4.9	0.1– 0.3	[30]
6	73.6–73.2	8.0–14.0		6.1– 7.3	4.2– 5.0	0.2	[31]
2	80.6–80.0						[21]
3	73.3–71.7	14.4–16.5		6.0– 7.0	4.2– 5.0	0.1– 0.2	[32]