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Types of acute toxicity measures and warnings [23].
| Categories | Signal Word | Oral mg/kg | Dermal mg/kg | Inhalation mg/L |
|---|---|---|---|---|
| I—Highly toxic | POISON | 0 to 50 | 0 to 200 | 0 to 0.2 |
| II—Moderately toxic | WARNING | 50 to 500 | 200 to 2,000 | 0.2 to 2.0 |
| III—Slightly toxic | CAUTION | 500 to 5,000 | 2,000 to 20,000 | 2.0 to 20 |
| IV—Relatively non-toxic | CAUTION | 5,000+ | 20,000+ | 20+ |
