Drometrizole trisiloxane

Drometrizole trisiloxane
Drometrizole trisiloxane
CAS number 155633-54-8 YesY
PubChem 9848888
ChemSpider 8024601 YesY
Jmol-3D images Image 1
Image 2
Molecular formula C24H39N3O3Si3
Molar mass 501.84 g mol−1
Exact mass 501.229921728 g mol-1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Drometrizole trisiloxane (INCI) is a lipophilic benzotriazole derivative marketed as Mexoryl XL by L'Oréal and is used in sunscreens to absorb UV radiation. It is a broad-spectrum UV absorber with two absorption peaks, one at 303 nm (UVB) and one at 344 nm (UVA). Just like Mexoryl SX (ecamsule), it is used exclusively in products by L'Oréal owned brands. Drometrizole trisiloxane and ecamsule are often used together, because they show a synergistic effect in protection.[1]


Sunscreens with drometrizole trisiloxane are approved within the EU,[2] Canada,[3] Australia,[4] Japan,[5] and other countries, but not in the United States.


  1. ^ Moyal D. (October 2004). "Prevention of ultraviolet-induced skin pigmentation". Photodermatol Photoimmunol Photomed 20 (5): 243–7. doi:10.1111/j.1600-0781.2004.00111.x. PMID 15379874. 
  2. ^ COUNCIL DIRECTIVE of 27 July 1976 on the approximation of the laws of the Member States relating to cosmetic products
  3. ^ Sunburn Protectants, Health Canada
  4. ^ Australian Regulatory Guidelines for OTC Medicines - Chapter 10
  5. ^ Forestier, S.; Ortiz, S,; Jitsukawa Setsuko (2004). "Mexoryl XL: A new UV protective agent". Fragr J 32 (4): 59–64. http://sciencelinks.jp/j-east/article/200411/000020041104A0360702.php. 

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