Severity index (S)

LD50

LC50

TLV (TWA/STEL/C)

5 (Other)

Specific effects on human health: carcinogenic, mutagenic or toxic to reproduction.

4 (Very toxic)

LD50 ≤ 50 mg/L (skin)

LD50 ≤ 25 mg/kg (ingestion/body weight)

Aerosols or particulates (rats):

LC50 ≤ 0.25 mg/liter/4 h

Gases and vapors:

LC50 ≤ 0.5 mg/liter/4 h

TLV ≤ 3 mg/m3

3 (Toxic)

50 < LD50 ≤ 400 mg/kg or mg/L (skin)

25 < LD50 ≤ 200 mg/kg (ingestion/body weight)

Aerosols or particulates (rats):

0.25 < LC50 ≤ 1 mg/liter/4 h

Gases and vapors (rats):

0.5 < LC50 ≤ 2 mg/liter/4 h

3 < TLV ≤ 9 mg/m3

2 (Harmful)

400 < LD50 ≤ 2000 mg/kg or mg/L (skin)

200 < LD50 ≤ 2000 mg/kg (ingestion/body weight)

Aerosols or particulates (rats):

1 < LC50 ≤ 5 mg/liter/4 h

b) Gases and vapors (rats):

2 < LC50 ≤ 20 mg/liter/4 h

9 < TLV ≤ 50 mg/m3

1 (Not classified)

Rats or rabbits: LD50 > 2000 mg/kg (body weight) or mg/L (skin)

Rats: LD50 > 2000 mg/kg (ingestion/body weight)

Aerosols or particulates (rats):

LC50 > 5 mg/liter/4 h

b) Gases and vapors (rats):

LC50 > 20 mg/liter/4 h

TLV > 50 mg/m3