Sodium propylparaben is a high-efficiency paraben-based antibacterial preservative with unique solubility characteristics different from sodium methylparaben and sodium ethylparaben. At 25°C, the ingredient is soluble in water with moderate solubility, slightly lower than sodium ethylparaben while maintaining qualified dissolution performance. It can also dissolve in glycerin and propylene glycol, and presents superior solubility in ethanol compared to shorter-chain sodium paraben derivatives, including methyl and ethyl variants, whilst being practically insoluble in grease substances. The raw material delivers stable chemical properties under dry and light-shielded storage environments. Its aqueous solution maintains good stability within a pH range of 3 to 7 (acidic to neutral). Severe acidic conditions will trigger hydrolysis reaction, converting the ingredient into propyl 4-hydroxybenzoate, which tends to precipitate out and disable preservative functions. Under standardized sealed storage environments, the product offers a shelf life of up to 24 months.
Key Advantages
Featuring typical broad-spectrum antimicrobial properties, sodium propylparaben exhibits outstanding inhibitory activity against molds and yeasts.
It achieves antibacterial effects by damaging microbial cell membranes and suppressing the activity of microbial enzyme systems to block microbial reproduction.
Following the industry rule of paraben series, its antibacterial potency increases with carbon chain length, making sodium propylparaben more effective than sodium ethylparaben and sodium methylparaben.
Benefiting from its optimal oil-water partition coefficient, this ingredient shows stronger inhibition performance against Gram-negative bacteria than short-chain paraben sodium salts.
It boasts stable formula adaptability and mild properties, supporting long-term antibacterial protection for cosmetic and pharmaceutical formulations without causing adverse impacts on finished product quality.
Specifications
| Chemical Name | Sodium Propyl 4-hydroxybenzoate |
| Molecular Formula | C10H11NaO₃ |
| CAS No. | 35285-69-9 |
| Appearance | White or almost white crystalline powder |
| Content | 98.5%～101.5% |
| PH Value(0.1% H2O Solution) | 9.5～10.5 |
| H2O | ≤5.0% |
| (Pb)mg/kg | ≤2.0 |
| Sulfate Content (as SO₄²⁻) | ≤0.030% |
| Chloride (as Cl) | ≤0.035% |
Applications
This stable and high-activity preservative is widely applicable in personal care and pharmaceutical manufacturing industries. In cosmetics and daily personal care fields, it is perfectly suitable for emulsified formulations such as creams, lotions and shampoos, providing reliable microbial protection for emulsion-based finished products. In the pharmaceutical industry, it serves as a professional preservative for pharmaceutical liquid preparations and external topical formulations, complying with pharmaceutical production specifications and effectively preventing microbial contamination during product storage and application.
Packaging & Storage
The standard packaging specification is 25kg per paper drum equipped with double-layer food-grade moisture-proof plastic inner bags to ensure excellent sealing performance, and customized packaging solutions are available according to client requirements.
For storage management, the product must be kept in cool, dry, clean and well-ventilated warehouses. Direct intense light exposure and high-temperature environments are strictly prohibited, and mixed storage with strong acid, strong alkali and oxidizing chemical raw materials is forbidden. Due to its strong moisture absorption property, the product requires full sealing during storage to prevent moisture absorption and quality deterioration.
Quality & Service
Manufactured in an ISO-certified facility, each batch comes with a Certificate of Analysis (COA). We offer reliable supply, technical support, and competitive pricing for bulk orders.
FAQ
Q: What are your payment terms?
A: T/T, L/C or other payment methods agreed by both parties are acceptable.
Q: What are the storage conditions of the product?
A: It should be kept in a tightly sealed container and stored in a cool, dry and well-ventilated warehouse. Keep it away from moisture and direct sunlight.
Q: What is the application scope of the product?
A: It can be used in cosmetics and personal care products such as creams, lotions and shampoos. In the pharmaceutical field, it is applied to liquid preparations and external preparations.
Request a Quote/Sample
Sourcing high-grade Sodium Propyl 4-hydroxybenzoate 35285-69-9 for your formulation requirements? Reach out to us promptly to obtain full datasheet details, free sample assistance and cost-competitive business pricing.
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