Ammonium Paratungstate

Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, raw material of Sodium Tungstate and Tungsten Trioxide production.

Formula: 5(NH4)2O.12WO3.5H2O.
Appearance: Free flowing white crystalline powder with no any other cast or foreign matter.
Ignition Loss: 11.5%max
Fsss: 35-46 micron.
Packing: In iron drums with inside plastic bags of 100kg or 200kg net each.

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Grade properties

Grade	APT-0
WO3（%min）	88.5
Impurities（%max）	Al	Fe	S	As	P	Mo	Ca	Mg	K	Na	Si
	0.0005	0.001	0.0007	0.001	0.0007	0.002	0.001	0.0007	0.001	0.001	0.001
	Cu	Mn	Ni	Pb	Bi	Sn	Sb	V	Ti	Cr	Co
	0.0003	0.001	0.0007	0.0001	0.0001	0.0008	0.001	0.001	0.001	0.001	0.001

Remarks:
1) APT-0 is high purity material for special uses.
2) Material of 40-46 micron is mainly used for producing tungsten bar for drawing wire
3) Any special requirement to the products can be discussed.”