Lapse in Appropriations
For workplace safety and health, please call 800-321-6742; for mine safety and health, please call 800-746-1553; for Job Corps, please call 800-733-5627 and for Wage and Hour, please call 866-487-9243 (866-4-US-WAGE). This website is currently not being updated due to the suspension of Federal government services. The last update to the site was 10/1/2025. Updates to the site will start again when the Federal government resumes operations.
1-METHOXY-2-PROPANOL
| CAS # | 107-98-2 |
|---|---|
| Formula |
C₄H₁₀O₂ |
| Synonyms |
Dowtherm209®; 1-methoxy-2-hydroxypropane; 1-methoxy-2-propanol; 2-methoxy-1-methylethanol; propylene glycol methyl ether |
| Physical description | Clear, colorless liquid with a mild, ethereal odor. | ||
|---|---|---|---|
| Boiling point | 248°F | Molecular weight | 90.1 |
| Freezing point/melting point | -139°F (sets to glass) | Vapor pressure | 12 mmHg |
| Flash point | 97°F | Vapor density | 3.11 |
| Specific gravity | 0.96 | Ionization potential | |
| Lower explosive limit (LEL) | 1.6% | Upper explosive limit (UEL) | 13.8% |
| NFPA health rating | 1 | NFPA fire rating | 3 |
| NFPA reactivity rating | 0 | NFPA special instruction | |
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Analyte code (IMIS no.) | 2210 |
|---|---|
| Sampling group | |
| Sampler/Sampling media | CSC tube (100/50 mg) [SKC 226-01] |
| Sampling time* | 100 min |
| Sampling volume (TWA)* | 10 L |
| Sampling flow rate (TWA)* | 0.1 L/min |
| Sampling volume (STEL/Peak/C)* | 3 L |
| Sampling flow rate (STEL/Peak/C)* | 0.2 L/min |
| Analytical method instruments | GC-FID |
| Method reference | OSHA 99 (fully 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.
| Wipe Sampler/Sampling media | |
|---|---|
| Bulk Method |
| Device | |||||
|---|---|---|---|---|---|
| Model/Type | |||||
|
Sampling information (see manufacturer instructions) |
|
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 |
|||||
|---|---|---|---|---|---|---|---|
| PEL-TWA | REL-TWA |
100 ppm (360 mg/m³) |
TLV-TWA |
50 ppm [2012] |
PEL-TWA |
100 ppm (360 mg/m³) |
|
| PEL-STEL | REL-STEL |
150 ppm (540 mg/m³) |
TLV-STEL |
100 ppm [2012] |
PEL-STEL |
150 ppm (540 mg/m³) |
|
| PEL-C | REL-C | TLV-C | PEL-C | ||||
| Skin notation |
NA |
Skin notation |
N |
Skin notation |
N |
Skin notation |
Y |
|
Notes:
Not established |
Notes: | Notes: | Notes: | ||||
| Health factors: See NIH-NLM PubChem. | IDLH | ||||||
| Carcinogenic classifications: TLV-A4 | Notes: | ||||||
| AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: | |||||||
Additional Resources and Literature References
|
NOAA: CAMEO Chemicals - 1-Methoxy-2-propanol NIOSH: Pocket Guide to Chemical Hazards - Propylene glycol monomethyl ether Literature References
|
Last Updated Date : 09/22/2022