Violet tungsten oxide powder may be applied for producing thermal insulating glass, such as building, car, cruise, aircraft, and the like.
The quality of the violet tungsten oxide was initially determined in accordance with the blue tungsten oxide and yellow tungsten oxide projects, except for the oxygen index, the specific surface, and the pseudo-specific gravity. Later, the researchers proposed to use phase composition or scanning electron microscopy to detect and control, that is, WO2.72 phase is greater than or equal to 98% or electron microscopic detection to control the number of non-acicular particles (particles without needles), but these detection methods are cumbersome and costly. And sometimes it is not easy to control quality.
Recently, some researchers have introduced a method for directly controlling and detecting the quality of violet tungsten oxide - the colorimetric method, using the unique color of violet tungsten oxide to make several types of violet tungsten oxide standards, refer to it. Color determines its quality. The color of the violet tungsten oxide standard can be divided into violet, violet red, violet black, blue black, and blue.
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