Stearic acid polyoxyethylene ether SG-9 (PEG-9 stearate) is a nonionic surfactant, not listed under GHS hazardous chemical classification, and is not considered a dangerous good. From an acute toxicity perspective, its oral LD50 in rats is greater than 2000 mg/kg, indicating low toxicity. The Ames test is negative, showing no mutagenicity, and under normal use conditions, it does not cause severe systemic poisoning hazards to the human body.
The main potential impact on human health centers on local irritation. According to risk phrases R36/37/38, this product is irritating to the eyes, respiratory system, and skin. Animal experimental data show: skin contact in rabbits for 4 hours results in mild irritation, and eye contact in rabbits results in moderate irritation. Therefore, during industrial operations or formulation use, accidental eye contact may cause significant discomfort and requires immediate flushing; it may also cause mild erythema or dryness in sensitive individuals. However, due to significant dilution in the final product (e.g., cosmetic formulations), this irritation is usually markedly reduced.
From an environmental perspective, the LC50 (96h for fish) of this product for aquatic organisms is 10–100 mg/L, indicating some hazard to aquatic organisms, and large direct discharges into water bodies could affect aquatic ecosystems. However, it is commendable that this product is readily biodegradable (biodegradation rate >60% under OECD 301B method), does not accumulate long-term in the natural environment, and the overall environmental risk is manageable. The key is to properly collect and treat industrial wastewater and spillage to avoid direct discharge untreated into soil, drains, sewers, and natural water bodies.
| Assessment Dimension | Indicator | Data |
|---|---|---|
| Human Health | Acute Toxicity (Rat Oral LD50) | >2000 mg/kg, low toxicity |
| Skin Irritation (Rabbit, 4h) | Mild irritation | |
| Eye Irritation (Rabbit) | Moderate irritation | |
| Mutagenicity (Ames Test) | Negative, no mutagenicity | |
| Environmental Impact | Ecotoxicity LC50 (Fish, 96h) | >10–100 mg/L, harmful to aquatic organisms |
| Biodegradability (OECD 301B) | >60%, readily biodegradable | |
| Heavy Metal Content | ≤10 mg/kg (Arsenic ≤2 mg/kg) | |
| Hazard Classification | GHS Classification | Not classified, non-hazardous |
| Risk Phrases | R36/37/38 | Irritating to eyes, respiratory system, and skin |
Based on the above safety and environmental characteristics, proper usage recommendations for stearic acid polyoxyethylene ether SG-9 are as follows:
(All data above are sourced from Guoli Chemical Product Technical Data Sheet and Safety Data Sheet.)