Agent Name

Ethylidene norbornene

CAS Number

16219-75-3

Formula

C9-H12

Major Category

Plastics & Rubber

Synonyms

2-Norbornene, 5-ethylidene-; 5-Ethylidene-2-norbornene; 5-Ethylidenebicyclo(2.2.1)hept-2-ene; ENB; Ethylidenenorbornene; [ChemIDplus] UN1992

Category

Other Monomers

Description

Colorless to white liquid with a turpentine-like odor; [NIOSH]

Sources/Uses

Used as the third monomer, the diene, in EPDM (ethylene-propylene diene monomer); EPDM is used to make the elastomer, ethylene-propylene terpolymer; [Hawley]

Comments

Subchronic animal studies (237 ppm for 7 hours/day, 5 days a week for 89 days):kidney and liver lesions, and 10 of 12 rats had testicular atrophy; Human volunteers complain of eye and nose irritation after a 30 minute exposure to either 5.6 ppm (4 subjects) or 11 ppm (2 subjects). [ACGIH] A skin, eye, and respiratory tract irritant; May have liver and kidney effects; [ICSC] Vapor is irritating; If inhaled will cause coughing, headache, and confusion; Will cause reddening of skin if contaminated clothing not removed; [CHRIS]

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

2 ppm

STEL (ACGIH)

4 ppm

Vapor Pressure

4 mm Hg

Odor Threshold Low

0.07 ppm

Lethal Concentration

LC50 (rat) = 1,246 ppm/4h

Explanatory Notes

Flash point = 38 deg C; Odor threshold (detection or recognition not specified), from CHEMINFO;

Adverse Effects
Neurotoxin

CNS Solvent Syndrome

Hepatotoxin

Hepatotoxin, Secondary

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: