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

    Drometrizole Trisiloxane CAS 155633-54-8

    Drometrizole Trisiloxane (CAS 155633-54-8) is a photostable UV absorber utilized as a broad-spectrum protective agent in high-performance cosmetic formulations and sunscreens. Chemically identified as 2-(2H-Benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]disiloxanyl]propyl]phenol, this viscous lipophilic liquid functions to filter both UVA and UVB radiation, preventing photodegradation of skin and product ingredients. As a specialized Benzotriazole silicone derivative, it is extensively integrated into anti-aging creams, hair care products, and color cosmetics to enhance solar protection factors (SPF) and photostability. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific purity and solubility requirements. Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

    • 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 is a benzotriazole derivative integrated with a silicone chain. This unique molecular structure gives it dual advantages: the potent UV-absorbing capability of the benzotriazole group and the excellent solubility and film-forming properties of the silicone group.

    Unlike some traditional UV filters that degrade under sunlight, Drometrizole Trisiloxane is highly photostable, maintaining its protective efficacy over time. It is oil-soluble, making it ideal for formulating water-resistant sunscreens. It works synergistically with other water-soluble UV filters to create a complete broad-spectrum defense system in emulsion systems (O/W or W/O).

    1 Physicochemical Properties
    2 Applications
    3 Storage Conditions
    4 Safety Precautions

    Physicochemical Properties

    Test ItemSpecification (Standard)
    AppearanceWhite to off-white crystalline powder
    IdentificationConsistent with standard spectrum
    Assay (Purity)≥ 98.0%
    Melting Point50.0°C – 55.0°C
    Loss on Drying (Volatile Matter)≤ 0.5%
    Extinction Coefficient (E 1%/1cm)≥ 360 (at 303nm)
    Heavy Metals≤ 10 ppm
    SolubilityInsoluble in water; Soluble in oil and esters
    Absorbance WavelengthPeak absorption in both UVB and short UVA range

    Applications

    1. Sun Care: A primary active ingredient in sunscreens, sunblocks, and tanning oils. It boosts the SPF value and UVA protection factor (PFA).
    2. Daily Skincare: Used in anti-aging day creams and moisturizers to prevent photo-aging caused by daily UV exposure.
    3. Color Cosmetics: Added to foundations, BB creams, and lipsticks to provide sun protection benefits.
    4. Hair Care: Occasionally used in hair products to protect hair fibers and color from fading due to UV radiation.

    For other UV-filter raw materials, subject to the target market’s regulatory status, see Octyl 4-Methoxycinnamate and Benzophenone-3.

    Storage Conditions

    • Temperature Control: Critical. The melting point is relatively low (approx. 50-55°C). Store in a cool place, strictly below 30°C, to prevent the powder from fusing or caking into a solid block.
    • Environment: Store in a dry, dark, and well-ventilated area.
    • Packaging: Keep containers tightly sealed to avoid contamination.
    • Shelf Life: 24 months from the production date when stored properly.

    Safety Precautions

    • Handling: Wear protective gloves, safety glasses, and a dust mask when handling the powder to avoid inhalation or contact with mucous membranes.
    • Skin/Eye Contact: Although it is a cosmetic ingredient, pure concentrated powder should be washed off with soap and water if it comes into contact with skin. For eyes, rinse thoroughly with water.
    • Combustibility: Keep away from open flames and heat sources.
    • Disposal: Dispose of contents/container in accordance with local regulations.

    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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