Phenylbenzimidazole Sulfonic Acid 10 g

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

Phenylbenzimidazole Sulfonic Acid, often referred to as Ensulizole, is a highly efficient, water-soluble chemical sunscreen agent that provides exceptional protection against ultraviolet B (UVB) radiation. Unlike many other organic UV filters that are oil-soluble and can leave a heavy or greasy residue, this component is prized for its ability to create lightweight, non-greasy, and transparent sun care formulations. It appears as a white to off-white crystalline powder and must be neutralized with a base, such as triethanolamine or sodium hydroxide, to become soluble and active within a cosmetic formula. This unique characteristic makes it an indispensable asset for formulators aiming to develop daily wear sunscreens, mattifying day creams, and high-performance sports lotions that feel invisible on the skin.

Technical Properties and Performance Benefits

The primary function of Phenylbenzimidazole Sulfonic Acid is to absorb UVB rays, which are the main cause of sunburn and DNA damage in the skin. When properly neutralized to a pH between 7.0 and 8.0, it transforms into a highly stable salt that offers excellent photostability and a smooth skin feel.

Key advantages include:

• High UVB Absorption: It features a high extinction coefficient, making it very effective at low concentrations for boosting the overall Sun Protection Factor (SPF) of a product.

• Water Solubility: Ideal for oil-in-water (O/W) emulsions, allowing for the creation of "dry-touch" formulas that are perfect for oily or acne-prone skin.

• Synergistic Effects: It works exceptionally well in combination with oil-soluble filters like Avobenzone, helping to stabilize them and increasing the broad-spectrum efficacy of the final product.

• Lightweight Sensory Profile: It provides a fresh, cooling sensation upon application and does not contribute to the "white cast" often associated with mineral sunscreens.

• Water Resistance: Because it is neutralized into a salt, it can be formulated into water-resistant products when combined with appropriate film-formers.

Detailed Applications and Usage Areas

Phenylbenzimidazole Sulfonic Acid is utilized across various segments of the personal care industry, supporting global shipping needs for high-quality cosmetic raw materials.

Daily Facial Moisturizers: It is a staple ingredient in day creams with SPF, providing essential protection against incidental sun exposure without ruining the aesthetic feel of the moisturizer or interfering with makeup application.

Oil-Free Sunscreen Gels: Due to its water-soluble nature, it is the preferred choice for transparent or translucent sunscreen gels and aqueous sprays designed for consumers who dislike traditional creamy lotions.

Sports and Outdoor Sunscreens: It is frequently used in high-SPF sports formulas because it does not feel heavy during physical activity and helps maintain a non-greasy grip.

Mattifying Sun Care: Perfect for products targeting oily and combination skin, as it helps maintain a matte finish while providing robust UVB defense.

After-Sun and Protective Hair Care: Sometimes incorporated into hair serums or leave-in conditioners to protect the hair shaft from UV-induced color fading and structural damage.

Anti-Aging Formulations: Used as a preventative active in anti-aging serums to stop the formation of sunspots and fine lines caused by chronic UVB exposure.

Recipe: Ultra-Light Daily UV Protection Essence

This recipe demonstrates how to properly neutralize and incorporate Phenylbenzimidazole Sulfonic Acid into a refreshing, lightweight essence for daily use.

Ingredients:

• Seventy-six milliliters Distilled Water (Aqueous Base)

• Four grams Phenylbenzimidazole Sulfonic Acid (UVB Filter)

• One point five milliliters Triethanolamine (Neutralizing Agent to achieve pH 7.0-7.5)

• Ten milliliters Aloe Vera Gel (Soothing Agent)

• Five milliliters Glycerin (Humectant)

• Two grams Panthenol (Provitamin B5)

• One point five milliliters Preservative (e.g., Phenoxyethanol)

Instructions for Preparation:

First Step — Acid Dispersion: In a heat-resistant glass beaker, add the Distilled Water and sprinkle the Phenylbenzimidazole Sulfonic Acid powder onto the surface. Stir manually until the powder is dispersed, though it will not be dissolved yet.

Second Step — Neutralization: Gradually add the Triethanolamine while stirring continuously. You will observe the cloudy mixture turning clear as the acid is neutralized and becomes soluble. Use a pH meter to ensure the solution reaches a pH of approximately 7.2. The solution must be clear before proceeding.

Third Step — Adding Humectants: Add the Glycerin, Aloe Vera Gel, and Panthenol to the clear aqueous phase. Stir for several minutes until the mixture is completely uniform and smooth.

Fourth Step — Preservation: Add the Preservative to the mixture. Stir thoroughly to ensure even distribution throughout the essence.

Fifth Step — Final Check and Bottling: Verify the final pH once more. If it remains within the 7.0 to 8.0 range, transfer the liquid to a dark glass bottle or a specialized pump dispenser to protect the actives from light.

Recommendations for Application and Storage:

• Neutralization Requirement: Never use this ingredient without neutralizing it first. The solubility and UV-absorbing capacity are only activated when the pH is adjusted to a neutral or slightly alkaline state.

• Usage Levels: The recommended usage level is typically between 2% and 4% for standard cosmetic products, depending on regional regulations.

• Storage Conditions: Store the raw powder and the finished essence in a cool, dry place. Avoid direct sunlight and extreme temperatures to prevent crystallization or degradation.

• Skin Compatibility: While generally well-tolerated, formulations with this ingredient should be tested for skin sensitivity due to the required neutral pH levels.