S P E C I F I C A T I O N S

SODIUM TETRABORATE CRYSTALS ACS

Synonyms:				Sodium borate decahydrate; borax; sodium 							pyroborate

CAS No:				1303-96-4

Formula:				Na2B4O7 * 10H2O

F.W.:					381.37

Assay:					99.5 - 105.0 %

pH of a 0.01 M solution:		9.15 - 9.20 @ 25°C

Insoluble matter:			0.005 % maximum

Chloride (Cl):			0.001 % maximum

Phosphate (PO4):			0.001 % maximum

Sulfate (SO4):			0.005 % maximum

Calcium (Ca):			0.005 % maximum

Heavy Metals (as Pb):		0.001 % maximum

Iron (Fe):				5 ppm maximum

Effective: 12/16/08