HelenFilter® OTZ is a very effective oil soluble UVB absorber. The absorbance of UVB at 314nm is as high as 1500. So only small dosage of HelenFil…
HelenFilter® OTZ is a very effective oil soluble UVB absorber. The absorbance of UVB at 314nm is as high as 1500. So only small dosage of HelenFilter® OTZ can achieve a very high SPF value. The highest recommend dosage is 5%.
HelenFilter® OTZ is very stable to sunlight. Its structure remains the same even if it is exposed to strong sunlight.
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