Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Information
Name: Methylparaben
Alias: Methyl 4-hydroxybenzoate, Methyl p-hydroxybenzoate
CAS No.: 99-76-3
Molecular Formula: C8H8O3
Letter-number format formula: C8H8O3
Molecular Weight: 152.15
2. Physical and Chemical Properties
Physical Properties
- Appearance: White crystalline powder
- Odor: Faint characteristic mild phenolic odor
- Solubility: Slightly soluble in cold water, soluble in hot water, ethanol, methanol, propylene glycol, acetone; insoluble in mineral oil
- Melting Point: 125–128 °C
- Hygroscopicity: Non-hygroscopic under normal humidity
Chemical Properties
- Molecular Structure: Benzene ring with para hydroxyl group and methyl ester functional group
- Antiseptic mechanism: Inhibits microbial cell membrane synthesis and enzyme activity, effective against bacteria, yeast and mold
- Ester hydrolysis: Stable under weak acid and neutral conditions; hydrolyzes under strong alkaline heating to generate 4-hydroxybenzoic acid and methanol
- Thermal stability: Stable below 100 °C; slight decomposition above 150 °C
- Photostability: Stable under indoor light; long-term intense UV exposure causes slight discoloration
- Compatibility: Compatible with most cosmetic, food and pharmaceutical raw materials; incompatible with strong alkalis, iron ions, nonionic surfactants in high concentration
3. Main Application Fields
1. Cosmetic Preservative (Core Application)
- Broad-spectrum antiseptic raw material for lotion, cream, mask, shampoo, essence and sunscreen
- Often compounded with ethylparaben, propylparaben to enhance antibacterial spectrum
2. Food Additive
Preservative for soy sauce, vinegar, beverage, jam, pastry and food seasoning, suitable for acidic food systems
3. Pharmaceutical Excipient
Antimicrobial preservative for oral syrups, external ointments, eye drops and liquid preparations
4. Analytical Reference Standard
HPLC standard substance for detecting parabens residues in cosmetics and food inspection laboratories
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 99-76-3 |
| Molecular Formula | C8H8O3 |
| Appearance | White crystalline powder |
| HPLC Purity | Cosmetic/Food Grade ≥99.0%; Reference Standard ≥99.5% |
| Melting Point | 125–128 °C |
| Loss on Drying | ≤0.50% |
| Residue on Ignition | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Arsenic (As) | ≤2 ppm |
| Packaging | 25kg PE-lined fiber drum |
| Storage Condition | Hermetic cool dry warehouse below 25 °C; segregated from alkaline and metal ion raw materials |
| Transportation Requirement | Non-dangerous goods, dust-proof sealed packaging |
| Shelf Life | 36 months under intact sealed packaging |
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