For outdoor exposures, the cut-on for short wavelength UV radiation is generally considered to be about 300nm.
在户外辐照，紫外线波长射线简写通常约为300 海哩。
Optical grade with UV cut-off up to 400 nm, greater optical purity than standard grades.
光学级紫外截止到400纳米，大于标准等级的光学纯度。
Optical grade with UV cut-off up to 400 nm, greater optical purity than standard grades.
光学级紫外截止到400纳米，大于标准等级的光学纯度。
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