Disodium Phenyl Dibenzimidazole Tetrasulfonate is a very effective and photostable UV-A II filter. The water-soluble UV-A absorber has a strong absorbance from 320 – 370 nm with an extinction of 800 at max. λ335 nm.
Disodium Phenyl Dibenzimidazole Tetrasulfonate exhibits synergies with other UV-attenuating materials and can be incorporated into various suncare formulations. Thanks to its water solubility effective water-based sprays and gels with UV-A protection can be formulated.
In Europe, Brazil, and South Africa Disodium Phenyl Dibenzimidazole Tetrasulfonate has been approved for use as a UV filter since 2000 with a maximum concentration of 10%. From 2004, it is approved in South Korea. South Korean authorities do not define an upper limit for UV filters but manufacturers have to register the finished formulation with the Korean Food and Drug Administration (KDFA).
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