Phenylbenzimidazole Sulfonic Acid 100 g

Phenylbenzimidazole Sulfonic Acid: Advanced Water-Soluble UV Protection for Modern Cosmetics

Phenylbenzimidazole Sulfonic Acid, commonly known as Ensulizole, is a highly effective, water-soluble chemical filter used extensively in the global cosmetic industry to provide robust protection against UVB radiation. Unlike many traditional UV filters that are oil-soluble and can leave a heavy or greasy residue, this component allows for the creation of lightweight, non-comedogenic, and transparent sun care formulations. It is a crystalline powder that, when neutralized with a base, becomes highly soluble in the water phase of an emulsion, making it an ideal choice for daily moisturizers, sunscreens for oily skin, and weightless sun protection gels. By absorbing ultraviolet rays and converting them into less harmful energy, it prevents sunburn and long-term DNA damage, ensuring the highest standards of skin safety and photostability.

Chemical Properties and Performance Benefits

The primary advantage of Phenylbenzimidazole Sulfonic Acid lies in its unique physical profile. It selectively absorbs UVB rays (280-320 nm), which are primarily responsible for erythema and immediate skin damage.

Key benefits and properties include:

• Excellent Water Solubility: Once neutralized with an alkali (such as Triethanolamine or Sodium Hydroxide), it integrates seamlessly into the water phase, allowing for "oil-free" claims.

• Lightweight Sensory Profile: It provides a fresh, cooling sensation upon application, making it perfect for sports sunscreens and clear sprays.

• Synergistic Effects: When combined with UVA filters like Avobenzone, it significantly boosts the overall SPF (Sun Protection Factor) of the final product.

• Photostability: It remains effective under prolonged sun exposure, maintaining its protective capabilities without rapid degradation.

• Non-Greasy Finish: Eliminates the "white cast" and heavy shine often associated with mineral or oil-soluble chemical filters.

Versatile Applications and Fields of Use

Phenylbenzimidazole Sulfonic Acid is a multi-functional ingredient used across various segments of the beauty and personal care industry.

Daily Face Creams and Lotions: It is the gold standard for daytime moisturizers where a light, invisible finish is required for wear under makeup.

Sunscreen Gels and Sprays: Its water solubility makes it the primary filter for transparent sun protection gels and aerosol sprays that do not require shaking before use.

Sports and Outdoor Sun Care: Because it can be formulated into "water-in-silicone" or lightweight aqueous systems, it is ideal for sweat-resistant sunscreens that do not feel sticky during physical activity.

Anti-Aging Skin Care: Integrated into anti-wrinkle serums to provide secondary protection against the UVB-induced photoaging that leads to fine lines and loss of elasticity.

Hair Care and Scalp Protection: Used in UV-protective hair sprays and leave-in conditioners to prevent color fading and protect the scalp from sun-induced irritation without weighing down the hair.

After-Sun and Recovery Products: Occasionally used in low concentrations in protective mists to shield sensitized skin from further UVB exposure during the healing process.

Recipe: Ultra-Lightweight Daily SPF 15 Hydrating Face Gel

This formulation demonstrates how to use Phenylbenzimidazole Sulfonic Acid to create a refreshing, non-greasy protective gel for daily use.

Ingredients:

• Eighty milliliters Distilled Water (Solvent base)

• Two grams Phenylbenzimidazole Sulfonic Acid (UVB Filter)

• One point five milliliters Triethanolamine (Neutralizing agent to achieve pH 7.0)

• Ten milliliters Aloe Vera Gel (Soothing agent)

• Five milliliters Glycerin (Humectant)

• One gram Carbomer (Thickener)

• One milliliter Broad Spectrum Preservative (Stability agent)

Instructions for Preparation:

First Step — Dispersing the UV Filter: Add the Phenylbenzimidazole Sulfonic Acid powder to the Distilled Water. Stir continuously; the mixture will initially appear cloudy as the acid is not yet dissolved.

Second Step — Neutralization: Slowly add the Triethanolamine drop by drop while stirring. You will observe the liquid turning completely clear as the acid is neutralized into a salt. Use a pH meter or strips to ensure the final pH is between 7.0 and 7.5.

Third Step — Creating the Gel Structure: Sift the Carbomer over the surface of the water-filter solution and allow it to hydrate for fifteen minutes. Stir gently until a smooth, viscous gel forms.

Fourth Step — Adding Conditioners: Integrate the Glycerin, Aloe Vera Gel, and the Preservative into the mixture. Stir for three minutes to ensure total homogeneity.

Fifth Step — Final Homogenization: Use a high-shear mixer or whisk to ensure all components are perfectly blended and the gel is crystal clear.

Usage and Storage Recommendations:

• pH Sensitivity: It is critical to maintain the pH above 6.8 to 7.0. If the pH drops, the Phenylbenzimidazole Sulfonic Acid may recrystallize, causing the gel to become gritty and lose its protective efficacy.

• Storage: Store the finished product in an opaque or UV-protected container. While the filter itself is stable, the botanical extracts like Aloe Vera can degrade in direct sunlight.

• Application: Apply evenly to the face twenty minutes before sun exposure. This gel is particularly suited for oily or combination skin types.

• Regulatory Compliance: Always check local regulations for maximum usage levels (typically up to 8% in the EU and 4% in the USA) to ensure safety and label compliance.