MORPHOLINE†

Chemical Identification

CAS # 110-91-8
Formula

C₄H₉NO

Synonyms

diethylene imidoxide; diethylene oximide; tetrahydro-1,4-oxazine; tetrahydro-p-oxazine

Physical Properties

Physical description Colorless liquid with a weak, ammonia- or fish-like odor.
Boiling point 264°F Molecular weight 87.12
Freezing point/melting point 23.2°F Vapor pressure 6 mmHg
Flash point 98°F (open cup) Vapor density 3
Specific gravity 1.007 Ionization potential 8.88 eV
Lower explosive limit (LEL) 1.8% Upper explosive limit (UEL) 10.8%
NFPA health rating 3 NFPA fire rating 3
NFPA reactivity rating 1 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA

Analyte code (IMIS no.) 1797
Sampling group
Sampler/Sampling media XAD-7 tube (80/40 mg) coated with 10% phosphoric acid [SKC 226-98]
Sampling time*

Sampling volume (TWA)*

10 L

Sampling flow rate (TWA)*

0.1 L/min

Sampling volume (STEL/Peak/C)*

Sampling flow rate (STEL/Peak/C)*

Analytical method instruments GC-FID
Method reference OSHA PV2123 (partially validated)
Notes

Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method

Wipe Sampler/Sampling media

Bulk Method

On-Site Screening Techniques

Device Infrared spectrophotometer Infrared spectrophotometer
Model/Type Miran 1A & 1B Miran 103
Sampling information
(see manufacturer instructions)
0.7 ppm@9 µm 0-100 ppm@9 µm

Exposure Limits

OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

20 ppm (70 mg/m³)

REL-TWA

20 ppm (70 mg/m³)

TLV-TWA

20 ppm [1992]

PEL-TWA

20 ppm (70 mg/m³)

PEL-STEL

REL-STEL

30 ppm (105 mg/m³)

TLV-STEL

PEL-STEL

30 ppm (105 mg/m³)

PEL-C

REL-C

TLV-C

PEL-C

Skin notation

Y

Skin notation

Y

Skin notation

Y

Skin notation

Y

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes:

Notes:

Notes:

Health factors: See NIH-NLM PubChem. IDLH

1400 ppm

Carcinogenic classifications: IARC-3, TLV-A4 Notes:

10% of LEL

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

Last Updated Date : 09/22/2022