NIOSH logo and tagline


May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)

CAS number: 107–15–3

NIOSH REL: 10 ppm (25 mg/m3) TWA

Current OSHA PEL: 10 ppm (25 mg/m3) TWA

1989 OSHA PEL: Same as current PEL

1993-1994 ACGIH TLV: 10 ppm (25 mg/m3) TWA [skin]

Description of Substance: Colorless, viscous liquid with an ammonia-like odor.

LEL(@12 F): 2.5% (10% LEL(@12 F), 2,500 ppm)

Original (SCP) IDLH: 2,000 ppm

Basis for original (SCP) IDLH: The chosen IDLH is based on the statement by AIHA [1970] that an 8-hour exposure to 4,000 ppm killed 6 of 6 rats, but that an 8-hour exposure to 2,000 ppm killed 0 of 6 rats [Smyth et al. 1951]. Further support for the chosen IDLH is gained from the statement by UCC [1971] that humans will not stay in concentrations of 2,000 ppm.

Short-term exposure guidelines: None developed


Lethal concentration data:

Species Reference LC50(ppm) LCLo(ppm) Time Adjusted 0.5-hrLC (CF) Derivedvalue
Rat Smyth et a. 1951 LC100: 4,000 —– 8 hr 10,000 ppm (2.5) 1,000 ppm


Lethal dose data:

Species Reference Route LD50(mg/kg) LDLo(mg/kg) Adjusted LD Derived value
RatG. pig


Izmerov et al. 1982Smyth et al. 1941

Smyth et al. 1951







1,400 ppm1,316 ppm

3,248 ppm

140 ppm132 ppm

325 ppm


Other animal data: It has been reported that rats have survived an 8-hour exposure to 2,000 ppm [Smyth et al. 1951].

Human data: It has been reported that workers will not stay in concentrations of 2,000 ppm [UCC 1971].



1. AIHA [1970]. Ethylene diamine. In: Hygienic guide series. Am Ind Hyg Assoc J 31:113-115.

2. Izmerov NF, Sanotsky IV, Sidorov KK [1982]. Toxicometric parameters of industrial toxic chemicals under single exposure. Moscow, Russia: Centre of International Projects, GKNT, p. 66.

3. Smyth HF, Seaton J, Fischer L [1941]. The single dose toxicity of some glycols and derivatives. J Ind Hyg Toxicol 23(6):259-268.

4. Smyth HF Jr, Carpenter CP, Weil CS [1951]. Range-finding toxicity data: list IV. AMA Arch Ind Hyg Occup Med 4:119-122.

5. UCC [1971]. Toxicology studies: ethylene diamine. New York, NY: Union Carbide Corporation.