CAS‑No：35285‑68‑8
EC No：252‑487‑6
Formula：C9H9NaO3
Molecular Weight：188.16 g/mol1.
Synonyms: Ethylparaben sodium salt; E215; Ethyl 4‑hydroxybenzoate sodium salt
Physical‑Chemical Properties
Melting point: 115‑118 °C (free acid ester)
Flash point: 121 °C
pH (1% aqueous solution): 9.5‑10.5
Solubility in water: Freely soluble, ~1000 g/L @20℃
Solubility: Soluble in ethanol; practically insoluble in dichloromethane
Bulk density: ~600 kg/m³
Decomposition temperature: >270℃
LogP: ‑0.14
Quality specification
| Test Item | Unit | Specification | Typical Result | Test Method |
|---|---|---|---|---|
| Appearance | — | White to off‑white hygroscopic crystalline powder | White crystalline powder | Visual |
| Identification | — | Positive | Complies | IR / Chemical test |
| Assay (on dry basis, HPLC) | % | 99.0‑103.0 | 100.2 | HPLC |
| pH (1 g/L aqueous solution) | — | 9.5‑10.5 | 10.1 | Potentiometry |
| Water Content | % | ≤5.0 | 2.15 | Karl‑Fischer |
| Chloride (Cl⁻) | % | ≤0.035 | 0.012 | EP‑221 |
| Sulphate (SO₄²⁻) | % | ≤0.030 | 0.010 | EP‑221 |
| 4‑Hydroxybenzoic acid | % | ≤4.0 | 0.22 | HPLC |
| Any single related impurity | % | ≤0.5 | 0.11 | HPLC |
| Total related impurities | % | ≤1.0 | 0.35 | HPLC |
| Heavy metals (as Pb) | ppm | ≤10 | <5 | AAS |
| Arsenic (As) | ppm | ≤1 | <1 | AAS |
| Solution clarity (10 % water solution) | — | Clear & colourless | Complies | Visual |
Main Applications
- Water‑soluble broad‑spectrum preservative & antimicrobial agent for cosmetics, personal‑care products
- Pharmaceutical formulations (oral & topical preparations) preservative E215
- Water‑based coating, lotion, liquid detergent biocide
- Compatible with other parabens for synergistic anti‑microbial effect
Packing, Storage & Handling
Packing: 25kg/fiber drum or paper bag, or as per request.
Store in cool, dry, well‑ventilated warehouse, 15‑25 °C, tightly sealed. Hygroscopic, protect from moisture
Keep away from strong acids, oxidizing agents
Avoid dust inhalation; wear dust mask, safety goggles, chemical resistant gloves
Prevent dust‑air mixture accumulation
Transport Information
Not classified as dangerous goods for international transport
Shipping name: Sodium ethyl‑4‑hydroxybenzoate
Packing group: N/AH315 Causes skin irritation
H318 Causes serious eye damage
Not PFAS / Not CMR substance.
WGK‑1 (slightly hazardous to water)
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