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    Related: Sunscreen Ingredient Homosalate
    • Drometrizole Trisiloxane CAS 155633-54-8

    Drometrizole Trisiloxane CAS 155633-54-8

    Drometrizole Trisiloxane (Mexoryl XL), CAS 155633-54-8, is a photostable oil-soluble benzotriazole UV filter supplied for sunscreens, daily skin care, color cosmetics and hair care. Confirm the required purity and grade, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 155633-54-8
    • Synonyms: Drometrizole trisiloxane, Mexoryl XL, 2-(2H-Benzotriazol-2-yl)-4-methyl-6-(2-methyl-3-(1,3,3,3-tetramethyl-1-(trimethylsilyloxy)disiloxanyl)propyl)phenol, Silatriazole UV absorber
    • Einecs: 417-010-9
    • Molecular Formula: C₂₄H₃₉N₃O₃Si₃
    • Grade: Cosmetic Grade (High Purity)
    • Package: 20kg or 25kg Fiber Drum / Carton
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    Product Description

    Drometrizole Trisiloxane, CAS 155633-54-8, also called Mexoryl XL, is a lipophilic benzotriazole UV filter modified with a silicone chain.

    Synonyms: Drometrizole trisiloxane; Mexoryl XL; 2-(2H-benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-(1,3,3,3-tetramethyl-1-(trimethylsilyloxy)disiloxanyl)propyl]phenol; silatriazole UV absorber.

    CAS: 155633-54-8.

    It is a white to off-white crystalline powder.

    It has a melting point of about 50–55 °C and an assay of not less than 98.0%.

    It is insoluble in water and soluble in oils and esters.

    Its extinction coefficient (E 1%/1 cm) is not less than 360 at 303 nm, with peak absorption in the UVB and short-UVA range.

    The silicone chain improves film formation, substantivity and water resistance.

    It is highly photostable and maintains its protective efficacy under UV exposure.

    It is used in sunscreens, sunblocks and tanning oils to boost SPF and UVA protection factor.

    It is used in anti-aging day creams, moisturizers, foundations, BB creams and lipsticks.

    It can be combined with water-soluble UV filters to build a broad-spectrum defense system in O/W or W/O emulsions.

    It is also used in some hair-care products to reduce UV-related fading and damage.

    Confirm appearance, identification, assay, melting point, loss on drying, extinction coefficient, heavy metals, solubility and absorbance wavelength.

    Store below 30 °C in a cool, dry, dark and well-ventilated area, away from heat and direct sunlight.

    Keep containers tightly sealed; the low melting point can cause the powder to cake or fuse at elevated temperature.

    Confirm packaging with the requested quantity and destination requirements.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required purity and grade, quantity, packaging, destination and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      What is Drometrizole Trisiloxane CAS 155633-54-8?

      A: Drometrizole Trisiloxane CAS 155633-54-8, also called Mexoryl XL, is a lipophilic benzotriazole UV filter modified with a silicone chain. It is used to provide broad-spectrum UVB and short-UVA protection in sunscreens and daily skin care.
    • Q:

      What UV range does Drometrizole Trisiloxane cover?

      A: It absorbs mainly in the UVB and short UVA, or UVA-II, range. This helps protect against sunburn and contributes to broad-spectrum formulations when combined with longer-wavelength UVA filters.
    • Q:

      Why is photostability important for this UV filter?

      A: Drometrizole Trisiloxane remains stable under UV exposure instead of breaking down quickly, so it can maintain its protective effect during use and help stabilize the overall sunscreen formulation.
    • Q:

      What is the solubility of Drometrizole Trisiloxane?

      A: It is insoluble in water and soluble in oils and esters. Its oil-soluble silicone structure supports use in water-resistant sunscreens, oil phases and emulsion systems.
    • Q:

      Why is Drometrizole Trisiloxane suitable for water-resistant sunscreen?

      A: The silicone portion of the molecule improves film formation and substantivity, helping the UV filter remain on the skin during water exposure. It can be combined with water-soluble filters to build a complete broad-spectrum system.
    • Q:

      What cosmetic applications use Drometrizole Trisiloxane?

      A: It is used in sunscreens, sunblocks, tanning oils, anti-aging day creams, moisturizers, foundations, BB creams and lipsticks. It can also be used in some hair products to reduce UV-related fading or damage.
    • Q:

      How should Drometrizole Trisiloxane be stored?

      A: Store below 30 C in a dry, dark, well-ventilated area and keep containers tightly sealed. Because the melting point is about 50-55 C, avoid heat that could cause the powder to cake or fuse.

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