YS/T 692-2009 “National Standard of the People’s Republic of China Nonferrous Metal Standard Tungstic Acid”

Table of chemical composition requirements for tungstic acid standards (%).

Grade		T.A-special	T.A-1	T.A-2
WO3≥		91.0	90.0	85.0
Impurity（≤）	Al	0.0005	0.001	0.001
	As	0.010	0.012	0.015
	Bi	0.0005	0.0005	0.0005
	Ca	0.005	0.008	0.010
	Co	0.001	0.001	0.001
	Cr	0.001	0.001	0.001
	Cu	0.0005	0.0005	0.0005
	Fe	0.003	0.004	0.004
	K	0.0005	0.0005	0.0005
	Mg	0.0005	0.0005	0.0005
	Mn	0.0005	0.0005	0.0005
	Mo	0.015	0.020	0.025
	Na	0.004	0.004	0.004
	Ni	0.0005	0.0005	0.0005
	P	0.005	0.005	0.005
	Pb	0.0005	0.0005	0.0005
	S	0.005	0.005	0.005
	Sb	0.0005	0.0005	0.0005
	Si	0.004	0.005	0.010
	Sn	0.0005	0.0005	0.0005
	Ti	0.001	0.001	0.001
	V	0.001	0.001	0.001
Other Requirement	Tungstic acid powder should pass through a 420μm sieve; bulk density is 0.65g/cm3～1.0g/cm3; appearance The tungstic acid powder is light yellow, and the color should be uniform without visible inclusions.
Note	Reference standards for inspection methods: Elemental chemical composition analysis is carried out in accordance with GB/T4324, particle size detection is in accordance with GB/T1480, bulk density measurement method is in accordance with GB/T1479, and product appearance quality is inspected visually.

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