CAS 27503-81-7 corresponds to 2-phenylbenzimidazole-5-sulfonic acid (Ensulizole/UV-T), which is a water-soluble chemical sunscreen that mainly absorbs UVB band and absorbs a small amount of UVA. It is widely used in sunscreen cosmetics and water-based systems.

Core Information
-Chinese name: 2-phenylbenzimidazole-5-sulfonic acid
-English name: 2-Phenylbenzimidazole-5-sulfonic acid
-Common aliases: UV absorbers UV-T, Ensulazole Ensulizole、PBSA
-Molecular formula: C ₁∝ H ₁₀ N ₂ O ∝ S
-Molecular weight: 274.3
-Appearance: White or off white fine crystalline powder
-Melting point: approximately 300 ° C
-Solubility: soluble in ethanol and isopropanol; Partially soluble in water (often in the form of sodium salts to enhance water solubility); Insoluble in oils and fats (such as Vaseline, olive oil)

Function and Application
-Main function: Efficient UVB absorber (peak at around 302 nm), improves SPF value, suitable for water-based formulations
-Application fields: sunscreen and skin care products, water-based lotion, some water-based coatings and high molecular light stabilizing additives
-Safety precautions: Free radicals may damage DNA under light exposure, and regulations in various countries usually limit the maximum amount of additives (such as the 8% limit for cosmetics in China); Store in a dark and sealed manner.

Additional notes
This substance is water-soluble due to its sulfonic acid groups, which distinguishes it from oil soluble sunscreen agents. It often needs to be neutralized into salts (such as sodium salts) to improve formula compatibility. Although low in irritation, there is a risk of photodegradation, and modern formulations are often used in combination with other stable sunscreen agents.

Products :

Ultraviolet absorbent UV-T CAS 27503-81-7
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