At present, a colorless and transparent UVA glass bottle that can block ultraviolet rays has attracted wide attention.
The most significant feature of glass bottles is the transparency of the contents. Because of this, external light can easily pass through the container, causing the content to change and deteriorate. For example, when beer is exposed to sunlight for a long time, it will produce odor and fading. Foreign experiments confirmed that when the light wavelength is 406 nm to 500 nm, the beer will fade until it stinks.
Recently, a transparent glass that absorbs ultraviolet rays has been developed abroad. It is produced by adding an ultraviolet absorbing metal oxide to the glass on the one hand. At the same time, by using the color-complementary effect, some metals or their oxides are added to discolor the colored glass.
For a UVA glass and normal glass with a thickness of 3.5 mm, a random sampling test of the light transmittance at a wavelength of 330 nm shows that the ordinary glass bottle is 60.6%, while the UVA glass is only 2.5%. Exposure to sunlight in ordinary glass bottles and UVA glass bottles also showed that the former had a much higher degree of discoloration and deterioration than the latter.
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