Standard Reference Materials (NIST SRMs) Group

From the standards library of the SPI Supplies and the C. M. Taylor Company

# AS9010-AB	SRM93a Borosilicate Glass
National Bureau of Standards origin with Certificate of Analysis Now the National Institute of Standards and Technology, NIST, Gaithersburg, MD USA

Element	Wt %	Oxide	Wt %
B	3.90	B₂O₃	12.56
O	53.8
Na	2.95	Na₂O	3.98
Mg	0.003	MgO	0.005
Al	1.21	Al₂O₃	2.28
Si	37.8	SiO₂	80.8
Cl	0.060	Cl	0.060
K	0.012	K₂O	0.014
Ca	0.01	CaO	0.01
Ti	0.008	TiO₂	0.014
Fe	0.020	Fe₂O₃	0.028
Zr	0.031	ZrO₂	0.042

Sum	99.8	Sum	99.8

2 x 2 x 1.2mm prisms and uncut slices
National Bureau of Standards

Name	Description	SPI #	Each
SRM93a Borosilicate Glass	SPI Supplies® Individual Mounted Microanalysis Standard Item	AS9010-AB	$
SRM93a Borosilicate Glass	SPI Supplies® Individual Loose Microanalysis Standard Item	AS9015-AB	$

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# AS9010-AB