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Chemical Sampling Information (CSI)
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General Description

Synonyms: 4-Ethylmorpholine

OSHA IMIS Code Number: 1225

Chemical Abstracts Service (CAS) Registry Number: 100-74-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: QE4025000; 49676

NIOSH Pocket Guide to Chemical Hazards, N-Ethylmorpholine : chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

colorless liquid with an ammonia-like odor
molecular weight: 115
vapor pressure: 5 mm
boiling point: 281°F
melting point: -81°F

Incompatibilities: Strong acids and oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 20 ppm, 94 mg/m3 (Skin)

Construction Industry: 20 ppm, 94 mg/m3 (Skin)

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 ppm, 24 mg/m3 TWA (Skin)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 ppm ceiling

Health Factors

Potential Symptoms: Eye, nose, throat irritation; vision disturbance; severe eye irritation from splashes

Health Effects: Acute Visual Effect (HE4) Irritation-Eye, Nose, Throat, Skin---Moderate (HE15)

Affected Organs: Respiratory system, eyes, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Silica Gel Tube (150/75 mg sections, 20/40 mesh)
    analytical solvent: 0.1M Sulfuric Acid
    maximum volume: 10 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH S-264)
    sampling analytical error: 0.17
    method classification: Fully Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: MSA
    part #: 92115
    range: 5-100 ppm
    class: Mfg

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