High-purity violet tungsten oxide, high-purity VTO for short, is a kind of violet powder with very high main content and very low impurity content. Its chemical formula is WO2.72 or W18O49.
High-purity material refers to a new type of material with high chemical purity, low impurity content, and excellent physical and chemical properties compared with conventional materials. It is obtained by modern metallurgy technology under a super-clean environment. With the continuous improvement of material purity, it will further reveal the potential performance of materials.
Purity
Generally, the purity of high-purity violet tungsten oxide can reach to 99.95% (3.5N), 99.99% (4N). And its purity can even reach 99.9995% (5.5N) if the production conditions, raw materials and other factors are getting better controlled.
There are various labellings in different industries, and the general labelling is by number 9, for example, the purity is 4.5N, representing the purity of 99.995%. And purity is 5N, which represents the purity of 99.999%.
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http://www.tungsten-powder.com/violet-tungsten-oxide.html
