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Yellow Tungsten Oxide National Standard

1. Range
This standard stipulates the types, technical requirement, test method, test rules of tungsten oxide. It is suitable for tungsten trioxide and blue tungsten oxide which is used to producing tungsten powder.

Product specification

Specification	Abbreviation	Chemical Formula	Class	Grade
Yellow Tungsten Oxide	YTO	WO₃	Special Grade	WO₃-0
			First Grade	WO₃-1
			Second Grade	WO₃-2
Blue Tungsten Oxide	BTO	W20O58	Special Grade	WOX-0
			First Grade	WOX-1
			Second Grade	WOX-2
PS: Blue tungsten oxide is the mix tungsten oxide of W20O58.

3. Technical requirement
3.1 Yellow tungsten oxide is light yellow crystalline powder , blue tungsten oxide is dark blue or black blue crystalline powder. The color is uniform. 3.2 There is no visible inclusion or crumb.
3.3 Tungsten oxide of all grades should go through 250um (60 mesh) sieve pore.
3.4 In the phase composition of blue tungsten oxide, W20O58 should be less than 70%.
3.5 Apparent density and average particle size should be negotiated by supplier and demander.
3.6 Tungsten oxide chemical content should meet the below stipulation:

Grade		WO₃-0 WOX-0	WO₃-1 WOX-1	WO₃-2 WOX-2
Impurity Content Impurity Content Less Than Max.	Al	0.0005	0.001	0.001
	As	0.001	0.001	0.003
	Bi	0.0001	0.0001	0.0005
	Ca	0.001	0.001	0.003
	Co	0.001	0.001	0.002
	Cr	0.001	0.001	0.001
	Cu	0.0003	0.0005	0.001
	Fe	0.001	0.001	0.003
	K	0.001	0.0015	0.002
	Mg	0.0007	0.001	0.002
	Mn	0.001	0.001	0.001
	Mo	0.002	0.005	0.02
	Na	0.001	0.0015	0.003
	Ni	0.0007	0.0007	0.001
	P	0.0007	0.001	0.002
	Pb	0.0001	0.0001	0.0005
	S	0.0007	0.001	0.001
	Sb	0.0005	0.001	0.002
	Si	0.001	0.001	0.003
	Sn	0.0002	0.0005	0.001
	Ti	0.001	0.001	0.002
	V	0.001	0.001	0.002
	WO₃ Calcination Loss	0.5	0.5	0.5

4.Test method
4.1 Appearance quality is tested by visual contact.
4.2 Test of grain size is processed under provision GB/T 3249.
4.3 Test of apparent density is processed under provision GB/T 1479.
4.4 Test of product chemical composition is processed under provision GB/T 4324.

5. Test rule
5.1 Product is checked by supplier to ensure the product is up to the standard, the product quality certificate is required.
5.2 After received the product, demander check the product according to the national standard. If the test result is not match to the stipulation, demander should inform the supplier within 3 monthes from the date of receive.
5.3 Product should be tested in batch, every batch should be consisted of the same blender.
5.4 Sample test of product is processed under provision GB/T 5314.
5.5 When the testing result is unqualified, then check this item repeated, if the repeated trials is still unqualified, then the product is below the standard.

6. Sign, packing, transportation, storage
6.1 Product is packed by barrel with polyethylene plastic bag inside, if there is special requirement for packing and the weight for per package, it should be negotiated by both demander and supplier.
6.2 Transportation and storage. During the transportation process, the product should be away from moisture, and avoid violent collision. Product should be installed under dry, ventilated, no acid-based atmosphere.
6.3 Quality certificate should be included in every batch of product.
1) Supplier name, address, postcode;
2) Product name, grade;
3) Batch number;
4) Weight (net weight and gross weight);
5) Standard number GB/T 26033-2010;
6) Test result and seal of quality inspection department;
7) Inspector ID;
8) Inspecting date.

If you have any other question or inquiry of tungsten oxide/trioxide, please feel free to contact us through the following methods:
Email:sales@chinatungsten.com
Tel.: +86 592 5129696/86 592 5129595
Fax: +86 592 5129797

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