Benzoic Acid
ELPROTECTTM – BZA
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Benzoic acid is a versatile aromatic carboxylic acid found naturally in many plants, valued for its antimicrobial, preservative, and pH-adjusting properties, widely utilized in personal care, food,…
CAS Number
65-85-0
HS Code
2916.31.10
INCI Name
Benzoic Acid
Molecular Formula
C₇H₆O₂
Benzoic Acid
ELPROTECTTM – BZA
Benzoic acid is a versatile aromatic carboxylic acid found naturally in many plants, valued for its antimicrobial, preservative, and pH-adjusting properties, widely utilized in personal care, food, and pharmaceutical applications due to its broad-spectrum efficacy, stability…
CAS Number
65-85-0
INCI Name
Benzoic Acid
HS Code
2916.31.10
Molecular Formula
C₇H₆O₂
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Product Specification
Physical Properties
| Property | Specification |
|---|---|
| Appearance | White to yellow-beige to orange solid; powder; needles |
| Molecular Weight (G/Mol) | 122.12 |
| Density | 1.08 |
| Refractive Index | 1.504 |
| Ph | 3.66(1 mM solution);3.12(10 mM solution);2.6(100 mM solution) |
Chemical Properties
| Property | Specification |
|---|---|
| Pka | 4.19(at 25℃) |
| Water Solubility | Slightly soluble. 0.34 g/100 mL |
Thermal Properties
| Property | Specification |
|---|---|
| Boiling Point | 249 °C(lit.) |
| Melting Point | 121-125 °C(lit.) |
| Flash Point | 250 °F |
Processing Methods & Reference Formulations
A. Hair Anti-Dandruff Shampoo
Add benzoic acid during the cooling phase to avoid degradation and maintain stability.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| Sulphur | 0.75% |
| Salicylic acid | 0.5–1.75% |
| Benzoic acid | 1.0–2.0 % |
| Sodium lauryl sulphate | 20% |
| Urea | 0.75% |
| Citric acid | 0.5% |
| Sodium EDTA | 0.5% |
| Guar gum | 1.5% |
| Tween 80 | 0.5% |
| Distilled water | 65-75% |
B. Cosmetic Ointment
Use benzoic acid in combination with emulsifiers to improve its distribution in semi-solid bases. Always verify the final pH of the ointment to ensure it remains within the effective antimicrobial range.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| 10–12% | |
| Salicylic acid | 0.5% |
| White vaseline | 62% |
| Stearic acid | 10% |
| Castor oil | 4% |
| Camphor | 1% |
| Sodium dodecyl benzene sulfonate | 0.9% |
| Ethylparaben | 0.1% |
C. Facial cleansers
Add Benzoic Acid to the water phase of facial cleanser formulations. Dissolve it fully with gentle heating if needed, and pair with other preservatives for broad-spectrum protection.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| 65% | |
| 3% | |
| Sodium Lauroyl Sarcosinate (30% in water) | 4.4% |
| Benzoic Acid | 0.2% |
| Disodium EDTA | 0.1% |
| PEG-200 Hydrogenated Glyceryl Palmate | 0.3% |
| PEG-7 Glyceryl Cocoate | 0.3% |
| PEG-75 | 2% |
| Fragrance | 0.25% |
| Citric Acid | 0.8% |
D. Moisturizering lotion
Add Benzoic Acid to the water phase of the moisturizer. Dissolve it with gentle heating if necessary, and consider combining it with other preservatives to broaden antimicrobial coverage.
| Key Ingredients | Indicative Dosage (% w/w) |
|---|---|
| 5% | |
| Stearic Acid | 3% |
| Cetyl Alcohol | 2% |
| Dimethicone | 2% |
| Propylene Glycol | 3% |
| Benzoic Acid | 0.2% |
| Phenoxyethanol | 0.5% |
| Tocopherol (Vitamin E) | 0.1% |
| Fragrance | 0.2% |
| Citric Acid | 0.1% |
| Aqua | 80-90% |
Dosing Guidelines
A. Dosing by Application
| Products | Authorized dosage % |
|---|---|
| Ointments/Creams | 0.5-2.5% |
| Sunscreen | 0.2-0.5% |
| Hair Shampoo | 0.2-2.5% |
About Benzoic Acid
About Benzoic Acid
Regulatory Compliance
| Region | Max Allowed Level | Notes | Certification Body |
|---|---|---|---|
| China | - | China Regulation | - |
| Japan | - | MHLW – Ministry of Health, Labour and Welfare | - |
| New Zealand | - | States that benzoic acid is safe for use for preservative and non-preservative purposes in cosmetic rinse-off products at a maximum concentration of 2.5 % and in cosmetic oral-care products upto 1.7 %, and in leave-on products up to 0.5 %. | - |
| United States | 5% | The CIR considers the chemical (benzoic acid and its salts) to be safe for use at a maximum allowed concentrations of 5 % (as acid) | FDA |
| European Union | - | States that benzoic acid is safe for use for preservative and non-preservative purposes in cosmetic rinse-off products at a maximum concentration of 2.5 % and in cosmetic oral-care products upto 1.7 %, and in leave-on products up to 0.5 %. | - |
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