Sinosorb® UV Absorber Benzophenone-4 CAS 4065-45-6

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Sinosorb® UV-284 (BP-4)

Sinosorb® UV Absorber, Benzophenone-4

Sinosorb UV-284 (BP-4 / Benzophenone-4) is a highly efficient broad-spectrum, water-soluble UV absorber that provides strong, simultaneous protection against both UVA (280–320 nm) and UVB (320–360 nm) radiation. Because of its sulfonic acid group, it is readily soluble in water and polar organic solvents without co-solvents, offering excellent photostability, thermal stability, and light stabilization in aqueous formulations.


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Chemical Name: 2-Hydroxy-4-methoxybenzophenone-5-sulfonic acid

CAS No.: 4065-45-6    

INCI: Benzophenone-4

MF / MW: C14H12O6S (MW: 308.31)

Chemical Structure:


Standard :
Parameter / ItemStandard Specification
Appearance (25°C)Off-white to light yellow powder
Assay (HPLC / Titration, dry basis)97.0 – 103.0 % (Min 99.0 %)
Melting Point145–150°C
Loss on Drying / Water Content≤ 2.0 % (or ≤ 5.0 % hydrate)
pH Value (1% aqueous solution, 25°C)1.5 – 2.5 (Acidic sulfonic acid)
Clarity / Appearance of SolutionClear, transparent solution in water
Color of Solution (Gardner, 100g/L)≤ 4.0 Gardner
Heavy Metals (as Pb)≤ 5 ppm (≤ 0.0005 %)
Specific Extinction E(1%, 1cm) at 286 nm≥ 460


Application :

• Cosmetics & Sun Care: Water-based sunscreens, sunblock gels, daily skin creams, moisturizers, lotions, and anti-aging cosmetics.


• Hair Care & Daily Toiletries: Shampoos, hair conditioners, styling gels, body washes, soaps, and fragrance stabilization.


• Waterborne Coatings & Polymers: Photostabilizer for waterborne paints, acrylic emulsions, clear varnishes, inks, and textile finishing.


Packaging and Shipping :

Packing: 25 kgs / Fiber Drum with inner PE liner; or 20 kgs


Storage :

Store in a tightly closed original container in a cool, dry, and well-ventilated area. Protect from direct sunlight, moisture, and high temperatures. Shelf life is 24 months under recommended storage conditions.


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