Uva series is a type of quartz glass tube added with titanium . its surface is colorless and its section is very light purple . this product can basically block the 220nm ultraviolet rays in the spectrum , and the transmittance of ultraviolet rays at 253 . 7nm is above 87 % . it can prevent dense ultraviolet radiation without generating ozone and is used in ozone-free lights and other illuminant lights.
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