SPI Supplies

6. Glass K-489 (SRM 30)

National Bureau of Standards original origin
Now the National Institute of Standards and Technology, NIST, Washington, DC USA
Si-Zn-Ba base composition doped with B, Ti, Fe, Zn, Zr, Ba, Ce, Ta and Pb

	Element	%		Oxide	%
	Li	0.001		Li₂O	0.002
	B	0.06		B₂O₃	0.20
	O	31.50
	Al	0.15		Al₂O₃	0.29
	Si	21.86		SiO₂	46.76
	Ti	0.28		TiO₂	0.46
	Fe	0.32		Fe₂O₃	0.46
	Zn	2.99		ZnO	3.72
	Zr	0.52		ZrO₂	0.70
	Ba	39.30		BaO	43.88
	Ta	1.03		Ta₂O₅	1.26
	Pb	1.19		PbO	1.28
	Ce	0.80		CeO₂	0.98

	Sum	100.0		Sum	100.0

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