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2-Phenylbenzimidazole-5-sulfonic acid
Product Introduction 2-Phenylbenzimidazole-5-sulfonic acid (Ensulizole, UV-T, PBSA, CAS No.: 27503-81-7) is a high-purity, water-soluble UVB ultraviolet absorber widely used in sunscreen cosmetics, personal care products, waterborne coatings, and polymer material stabilizers. This product effectivel...
Product Introduction
2-Phenylbenzimidazole-5-sulfonic acid (Ensulizole, UV-T, PBSA, CAS No.: 27503-81-7) is a high-purity, water-soluble UVB ultraviolet absorber widely used in sunscreen cosmetics, personal care products, waterborne coatings, and polymer material stabilizers. This product effectively enhances the SPF value of sunscreen formulations, strengthens UVB protection performance, and offers excellent compatibility with aqueous-phase systems.
Basic Information
Product Name: 2-Phenylbenzimidazole-5-sulfonic acid
CAS No.: 27503-81-7
Molecular Formula: C₁₃H₁₀N₂O₃S
Molecular Weight: 274.3
EINECS No.: 248-502-0
HS Code: 29339990
Synonyms: UV-T, Ensulizole, PBSA, Phenylbenzimidazole Sulfonic Acid
Structural Formula:
Product Advantages
- High-efficiency UVB ultraviolet absorption
- Excellent water solubility, suitable for water-based systems
- Helps increase SPF value of sunscreen products
- Good compatibility with water-based cosmetic formulations
- Can be used for UV stabilization of coatings and polymer materials
- High product purity (≥98%)
- Stable quality, suitable for industrial continuous production
- Strong formulation adaptability, wide application range
Industry Applications
Cosmetics & Personal Care Industry
- Sunscreen creams
- Sunscreen lotions
- Daily sun care products
- Skincare formulations
Waterborne Coatings Industry
- Improved weather resistance
- Reduced UV-induced aging
- Extended coating service life
Polymer Materials Industry
- Plastic stabilizers
- UV-sensitive material protection
- Specialty polymer systems
Scientific Research & Fine Chemicals
- Light stabilizers
- Dye auxiliaries
- Analytical reagents
- R&D experimental raw materials
Technical Specifications
| Appearance | Fine crystalline powder |
| Density | 1.3592 (estimated value) |
| Vapor Pressure | 0 Pa at 20°C |
| Purity | ≥98% |
| Melting Point | >300°C |
| Loss on Drying | ≤2.0% |
| Specific Absorbance | 920–990 (1%, 1cm, 302nm) |
Why Choose Our Product
- Strict quality control system
- Stable and reliable product quality
- Extensive international export experience
- Consistent and reliable supply capacity
- Support for customer product development and technical consultation
- High batch-to-batch consistency
- Meets cosmetic and industrial-grade application requirements
Packaging & Storage
Packaging Specifications: 25 kg/drum
Storage Conditions:
- Keep sealed
- Store in a cool, dry, well-ventilated area
- Avoid direct sunlight
- Protect from moisture
- Keep container tightly closed after use
Technical Indicators
| Solubility | As the sodium salt, it is soluble in water; also soluble in ethanol and water. |
| Hygroscopicity | Hygroscopic. |
| Hazard Statements | R36/37/38 — Irritating to eyes, respiratory system, and skin. |
| Safety Statements | S26, S36. |
| Hazard Symbol | Xi (Irritant). |
Frequently Asked Questions (FAQ)
Q1: What is 2-Phenylbenzimidazole-5-sulfonic acid primarily used for?
A: It is primarily used as a UVB ultraviolet absorber in sunscreen cosmetics.
Q2: Is PBSA water-soluble?
A: Yes, it has good water solubility in its sodium salt form.
Q3: Is this product suitable for sunscreen formulations?
A: Yes, it can effectively increase the SPF value of sunscreen products.
Q4: What purity specifications are available?
A: The standard product purity is not less than 98%.
Q5: How should the product be stored?
A: It is recommended to store in a sealed container in a cool, dry, light-protected environment.
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