UV400 txhais li cas?
Apr 06, 2022
UV400 txhais tau tias 100 feem pua UV-resistant. Ultraviolet rays xa mus rau lub hnub ci nrog wavelengths ntawm 200nm thiab 380nm, suav nrog peb hom: UVA wavelengths ntawm 315nm txog 380nm, UVB wavelengths ntawm 280nm txog 315nm, thiab UVC wavelengths ntawm 2080nm rau 2. Ultraviolet rays suav txog li 13 feem pua ntawm cov hnub ci rays (290nm-2000}nm) ncav cuag lub ntiaj teb saum npoo.
