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Ammonium Metatungstate

Molecular Formula: (NH₄) ₆H₂W₁₂O₄₀ • XH₂O

Appearance: White crystallized powder

Application: Mainly used for petroleum industry. It's the basic raw material of W-base catalyzer used in oil refinery.

Grade and Chemical Composition:

Grade AMT-1A
AMT-1B
AMT-1C AMT-2A
AMT-2B
AMT-2C

Purity Min. (%) 99.95 99.90

Main Comp. WO₃ Min. (%) 83.0 83.0

Content of Other Chemical
Element Max. (%) Al 0.001 0.001

As 0.001 0.001

Bi 0.0001 0.0001

Ca 0.001 0.003

Cr 0.001 0.001

Cu 0.001 0.003

Fe 0.002 0.003

K 0.0015 0.002

Mg 0.001 0.002

Mn 0.001 0.001

Mo 0.005 0.01

Na 0.0015 0.002

Ni 0.001 0.001

P 0.001 0.003

Pb 0.0001 0.0001

S 0.0005 0.001

Sb 0.001 0.002

Si 0.001 0.002

Sn 0.0001 0.0003

Ti 0.001 0.002

V 0.001 0.002

Matter Undisolved in Water Max. 0.5 0.5

pH Value 3.0~4.5 3.0~4.5

Grade		AMT-1A AMT-1B AMT-1C	AMT-2A AMT-2B AMT-2C
Purity Min. (%)		99.95	99.90
Main Comp. WO₃ Min. (%)		83.0	83.0
Content of Other Chemical Element Max. (%)	Al	0.001	0.001
	As	0.001	0.001
	Bi	0.0001	0.0001
	Ca	0.001	0.003
	Cr	0.001	0.001
	Cu	0.001	0.003
	Fe	0.002	0.003
	K	0.0015	0.002
	Mg	0.001	0.002
	Mn	0.001	0.001
	Mo	0.005	0.01
	Na	0.0015	0.002
	Ni	0.001	0.001
	P	0.001	0.003
	Pb	0.0001	0.0001
	S	0.0005	0.001
	Sb	0.001	0.002
	Si	0.001	0.002
	Sn	0.0001	0.0003
	Ti	0.001	0.002
	V	0.001	0.002
Matter Undisolved in Water Max.		0.5	0.5
pH Value		3.0~4.5	3.0~4.5