Table 4.
Safety scoring according to LD50
| WHO classification | Score | Acute LD50 for rats (mg/kg body weight) | |||
|---|---|---|---|---|---|
| Oral | Dermal | ||||
| Solid | Liquid | Solid | Liquid | ||
| Ia – Extremely hazardous | -10 | ≤5 | ≤20 | ≤10 | ≤40 |
| Ib – Highly hazardous | -8 | >5 – 50 | >20 – 200 | >10 – 100 | >40 - 400 |
| II – Moderately hazardous | -5 | >50 – 500 | >200 – 2000 | >100 – 1000 | >400 - 4000 |
| III – Slightly hazardous | -2 | >500 – 2000 | >2000 – 3000 | >1000 – 4000 | >4000 - 6000 |
| Unlikely to present acute hazard | +6 | >2000 | >3000 | >4000 | >6000 |
| Not Tested | 0 | ||||
(Source: ANNEX 2: WHO HAZARD CLASSIFICATION - ACUTE LD50 VALUES OF FORMULATED PRODUCTS. In: THE GUIDEBOOK TO THE REGISTRATION OF PUBLIC HEALTH PESTICIDES AND REPELLENTS AGAINST VECTORS. http://app.nea.gov.sg/cms/htdocs/article.asp?pid=1211)