METHYLAL (DIMETHOXY-METHANE) (DIMETHOXYMETHANE)†
Chemical Identification | |
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CAS # | 109-87-5 |
Formula |
C₃H₈O₂ |
Synonyms |
dimethoxymethane; formaldehyde dimethylacetal; methoxymethyl methyl ether; methylene dimethyl ether |
Physical Properties | |||
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Physical description | Colorless liquid with a chloroform-like odor. | ||
Boiling point | 111°F | Molecular weight | 76.1 |
Freezing point/melting point | -157°F | Vapor pressure | 330 mmHg |
Flash point | -26°F (open cup) | Vapor density | 2.6 |
Specific gravity | 0.86 | Ionization potential | 10.00 eV |
Lower explosive limit (LEL) | 1.6% | Upper explosive limit (UEL) | 17.6% |
NFPA health rating | 1 | 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 | ||||||
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Analyte code (IMIS no.) | 1655 | |||||
Sampling group | ||||||
Sampler/Sampling media | CSC tube (100/50 mg) [SKC 226-01] | |||||
Sampling time* |
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Sampling volume (TWA)* | 1-3 L |
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Sampling flow rate (TWA)* | 0.01 - 0.2 L/min |
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Sampling volume (STEL/Peak/C)* |
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Sampling flow rate (STEL/Peak/C)* |
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Analytical method instruments | GC-FID | |||||
Method reference | NIOSH 1611 (fully validated) | |||||
Notes |
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Special requirements |
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* 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 Method | |
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Sampler/Sampling media |
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Bulk Method |
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On-Site Screening Techniques | ||||||
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Device | Infrared spectrophotometer | |||||
Model/Type | Miran 1A & 1B | |||||
Sampling information (see manufacturer instructions) |
0.1 ppm@9.5 µm |
Exposure Limits | |||||||
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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 |
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PEL-TWA |
1000 ppm (3100 mg/m³) |
REL-TWA |
1000 ppm (3100 mg/m³) |
TLV-TWA |
1000 ppm [1970] |
PEL-TWA |
1000 ppm (3100 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
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PEL-C |
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REL-C |
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TLV-C |
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PEL-C |
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Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
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Notes:
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Notes:
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Health factors: See NIH-NLM PubChem. | IDLH |
2200 ppm |
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Carcinogenic classifications: Not listed |
Notes:
10% of LEL |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Methylal NIOSH: Pocket Guide to Chemical Hazards - Methylal Literature References
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Last Updated Date : 01/05/2021