XPO-5 (tristyrylphenol ethoxylate ammonium sulfate) demonstrates good safety in toxicological assessments. The acute oral toxicity test shows an LD₅₀ greater than 2000 mg/kg in rats, classifying it as low toxicity. In terms of skin irritation, the Draize test in rabbits (4-hour contact with the original solution) yielded negative results, indicating no skin irritation. The ocular irritation index is ≤ 1.0, which may cause slight discomfort, but it is professionally determined to be non-irritating to the eyes. Furthermore, the guinea pig maximization test shows that the product has no skin sensitization potential and does not cause allergic reactions. Overall, as long as basic protective measures are followed in industrial applications, the risk to human health is extremely low.
In terms of environmental safety, XPO-5 also performs well. In acute toxicity tests on aquatic organisms, the 96-hour LC₅₀ for zebrafish is greater than 100 mg/L, and the 48-hour EC₅₀ for Daphnia magna is also greater than 100 mg/L, both indicating low toxicity to aquatic life. More importantly, biodegradability tests conducted according to OECD 301B show that the degradation rate exceeds 70% within 28 days, classifying it as "readily biodegradable." This means that XPO-5 does not persist or bioaccumulate in the natural environment, and its impact on aquatic ecosystems is controllable.
It should be noted that although XPO-5 is safe under normal use conditions, under extreme circumstances (such as fire or high-temperature decomposition), the ammonium sulfate group and polyoxyethylene chain in its molecular structure may decompose to produce harmful gases such as carbon monoxide, carbon dioxide, sulfur oxides (SOₓ), and ammonia. Therefore, during storage and transportation, it should be kept away from heat sources and open flames.
| Item | Index | Judgment |
|---|---|---|
| Acute oral toxicity (rat) | LD₅₀ > 2000 mg/kg | Low toxicity |
| Skin irritation (rabbit, original solution, 4 h) | Draize test negative | Non-irritating |
| Eye irritation (rabbit) | Ocular irritation index ≤ 1.0 | Non-irritating |
| Skin sensitization (guinea pig) | Maximization test negative | Non-sensitizing |
| Fish acute toxicity (zebrafish, 96 h) | LC₅₀ > 100 mg/L | Low toxicity |
| Daphnia toxicity (Daphnia magna, 48 h) | EC₅₀ > 100 mg/L | Low toxicity |
| Biodegradability (OECD 301B, 28 days) | Degradation rate > 70% | Readily biodegradable |
| Thermal decomposition products | CO, CO₂, SOₓ, NH₃ | — |
Based on its low toxicity, low irritation, and ready biodegradability, XPO-5 is particularly suitable for applications with high requirements for human and environmental safety: