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Tungsten Trioxide(YTO)
	Grade and chemical composition

Grade		B2	B3
	WO3 Content (%min)	99.5	99.5
Impurities (% max)	Element	Max	Max
	A1	0.0010	0.00
	As	0.0080	0.01
	Bi	0.0010	0.0010
	Ca	0.0040	0.0050
	Cu	0.0010	0.0010
	Fe	0.0030	0.0050
	Mg	0.0010	0.0010
	K	0.0010	0.0010
	Mn	0.0020	0.0020
	Mo	0.010	0.015
	Na	0.0040	0.0040
	Ni	0.0020	0.0020
	P	0.0040	0.0040
	Pb	0.0010	0.0010
	S	0.0040	0.0040
	Sb	0.0010	0.0010
	Si	0.0040	0.0080
	Sn	0.0010	0.0010

Grade		A
	WO3 Content (%min)	99.8
Impurities (%max)	Element	Max	Element	Max
	A1	0.0005	Na	0.0007
	As	0.0009	Ni	0.0005
	Bi	0.0001	P	0.0007
	Ca	0.0005	Pb	0.0001
	Cd	0.0001	S	0.0007
	Cr	0.0005	Sb	0.0003
	Co	0.0005	Si	0.001
	Cu	0.0001	Sn	0.0001
	Fe	0.001	Ti	0.0005
	Mg	0.0005	V	0.0005
	Mn	0.0005	K	0.001
	Mo	0.002

Physical properties:apparent density: 2.4-30g/cm³FSSS:12-20um

Physical properties:Loss on ignition:0.5g/cm³ FSSS:0.6-1.5um
Apparent density:B2:0.6-1.0g/cm³;B3:0.6-1.0g/cm³
Packing:in iron drum with inner cloth bag or plastic bag of 50kgs,100kgs or 200kgs net each