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CAS 109-87-5

CAS 109-87-5 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 109-87-5
CAS 109-87-5PubChem CID 8020

Dimethoxymethane

Dimethoxymethane is an acetal that is the dimethyl acetal derivative of formaldehyde. It is a diether and an acetal. It is functionally related to a methanediol. — ChEBI

IUPAC name
dimethoxymethane
Molecular formula
C3H8O2
Molecular weight
76.09 g/mol
Exact mass
76.052429494 Da
XLogP3
0.2
Topological polar surface area
18.5 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
2
Covalent units
1
Defined stereocentres
0

Also known as

METHYLALFormalMethane, dimethoxy-Formaldehyde dimethyl acetalDimethyl formalAnesthenyl2,4-DioxapentaneMethylene dimethyl ether
16 more reported names
Bis(methoxy)methaneMethoxymethyl methyl etherFormaldehyde methyl ketalMetylalFormaldehyde dimethylacetal7H1M4G2NUECHEBI:48341RefChem:134194203-714-2Dimethoxy methanebis(methyloxy)methaneMethylene glycol dimethyletherMetylal [Polish]DimethylformalMethylene Glycol Dimethyl EtherHSDB 1820
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match8020

Attributed physical-property, hazard, environmental and use annotations.

  • First Aid: Excerpt from NIOSH Pocket Guide for Methylal:; Eye: IRRIGATE IMMEDIATELY - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: WATER FLUSH PROMPTLY - If this chemical contacts the skin, flush the contaminated skin with water promptly. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water promptly. If irritation persists after washing, get medical attention.; Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.; Swallow: MEDICAL ATTENTION IMMEDIATELY - If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2024) Source: CAMEO Chemicals
  • ERG2024, Guide 127 (Methylal): General First Aid:; · Call 911 or emergency medical service.; · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.; · Move victim to fresh air if it can be done safely.; · Administer oxygen if breathing is difficult.; · If victim is not breathing:; -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.; -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).; -- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.; · Remove and isolate contaminated clothing and shoes.; · For minor skin contact, avoid spreading material on unaffected skin.; · In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.; · For severe burns, immediate medical attention is required.; · Effects of exposure (inhalation, ingestion, Source: Emergency Response Guidebook (ERG)
  • First Aid: (General first aid procedures); Eye: Irrigate immediately - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: Water flush promptly - If this chemical contacts the skin, flush the contaminated skin with water promptly. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water promptly. If irritation persists after washing, get medical attention.; Breathing: Respiratory support; Swallow: Medical attention immediately - If this chemical has been swallowed, get medical attention immediately. Source: The National Institute for Occupational Safety and Health (NIOSH)
  • Note: This chemical does not meet GHS hazard criteria for 1.2% (5 of 433) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H225 (98.8%): Highly Flammable liquid and vapor [Danger Flammable liquids]; H315 (18.5%): Causes skin irritation [Warning Skin corrosion/irritation]; H319 (42%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (18.2%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 433 reports by companies from 19 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 5 of 433 reports by companies.; There are 18 notifications provided by 428 of 433 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: NITE-CMC
  • GHS Hazard Statements: H225: Highly Flammable liquid and vapor [Danger Flammable liquids]; H315: Causes skin irritation [Warning Skin corrosion/irritation]; H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H336: May cause drowsiness or dizziness [Warning Specific target organ toxicity, single exposure; Narcotic effects] Source: NITE-CMC
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
  • NFPA Health Rating: 2 - Materials that, under emergency conditions, can cause temporary incapacitation or residual injury. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Fire Rating: 3 - Liquids and solids that can be ignited under almost all ambient temperature conditions. Materials produce hazardous atmospheres with air under almost all ambient temperatures or, though unaffected by ambient temperatures, are readily ignited under almost all conditions. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Instability Rating: 2 - Materials that readily undergo violent chemical changes at elevated temperatures and pressures. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Specific Notice: W - No water: Materials that react violently or explosively with water. Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Bioconcentration: The BCF for methylal, estimated from its octanol/water partition coefficient, 0.00(1), using a recommended regression equation is 0.6(2,SRC). Therefore, methylal should not bioconcentrate in fish and aquatic organisms. Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: TERRESTRIAL FATE: If released on land, methylal would volatilize rapidly due to its high vapor pressure and Henry's Law constant and low adsorptivity to soil. It would also exhibit high mobility in soil. The importance of biodegradation in soil is unknown. (SRC) Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: AQUATIC FATE: If released to water, methylal will be primarily lost through volatilization. Its half-life in a model river is estimated from a calculated Henry's Law constant to be 7.2 hr(1-3). Adsorption to sediment and particulate matter in the water column, and bioconcentration should not be important. The importance of biodegradation in water is unknown. Hydrolysis is fairly slow(SRC). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: ATMOSPHERIC FATE: The atmosphere is the sink for methylal. In the atmosphere, methylal will degrade by reaction with photochemically-produced hydroxyl radicals. The half-life for this reaction is estimated to be 2.3 days(1). Methylal is highly soluble in water, 2.44X10+5 ppm(2), and would be washed out by rain. However, methylal thus remove would be recycled back into the atmosphere. (SRC) Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 109-87-5

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How CAS 109-87-5 is used on this site

CAS 109-87-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 109-87-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.