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(ACC) meeting has included nanoform of Methylene Bis BenzotriazolylTetramethylbutylphenol (MBBT) in the list of permitted UV Filter amending Annex VII of the ASEAN Cosmetic Directive (ACD).

MBBT will be listed with Reference no. 23a, 2,2’-Methylene-bis(6-(2H-benzotriazol-2-yl)-4-(tetramethyl-butyl)-1,1,3,3‑phenol);2,2’-Methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3‑tetramethylbutyl) phenol) CAS # 103597–45‑1.

ACC has established a maximum concentration limit of 10% when using the said substance. MBBT’s inclusion as a UV filter must also adhere to the following criteria to avoid lung exposure by inhalation:

  • Purity 98.5 %, with 2,2′-methylene-bis-(6(2H-benzotriazol-2-yl)-4-(isooctyl) phenol) isomer fraction not exceeding 1.5 %
  • Solubility 5 ng/L in water at 25 °C
  • Partition coefficient (Log Pow) : 12.7 at 25 °C
  • It must be uncoated

Median particle size D50 (50% of number below this diameter): 120 nm of mass distribution and/or 60 nm of number size distribution.

This change on the ACD will be effective from December 1, 2019.