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Solvent with a high KB value, high water miscibility, and quick drying time, which makes it an ideal cleaning, degreasing, and aerosol formulation ingredient.

Key Features

  • High solvent strength
  • Fast evaporation rate
  • Low toxicity profile


  • Aerosol cosolvent
  • SNAP approved Polyurethane Blowing Agent
  • Polyoxymethane resin polymer component
  • Paint and graffiti remover
  • Cleaning solvent

Description and Physical Properties

Formula C3H8O2
Molecular Weight (g/mol)  76.08
CAS Number   [109-87-5]
Other NamesMethylal
Appearance Clear, colorless liquid
Density, g/ml 0.861
Boiling Point, °C 42.3
Flash Point – Closed Cup, °C -18
Solubility in Water, %32.3
Surface Tension @ 25°C, N/m 21.2
Vapor Pressure @ 20°C, psi 5.88
Kinematic Viscosity @ 25°C 0.371
MIR Value0.94
KB Value 164
GWP (100 year) < 3

SNAP Substitute Acceptable Listing Status1


Saturated Light Hydrocarbons (C3-C6)


Class I (CFCs) and II ODS (HCFC-141b, 142b, 22 blends)
Rigid PU: ApplianceYesYesNoNo
Rigid PU: SprayYesNoNoNo
Rigid PU: Commercial RefrigerationYesYesNoNo
Rigid PU: Marine Flotation Foam YesYesNoNo
Rigid PU: Sandwich PanelsYesYesNoNo
Flexible PUYesYesNoNo
Integral Skin PUYesYesYesNo
Rigid PU: Slabstock & OtherYesYesNoNo
Rigid PU & Polyisocyanurate Laminated BoardstockYesYesNoNo
Polystyrene: Extruded Boardstock & BilletNoYesNoNo
Polystyrene: Extruded SheetNoYesNoNo
Phenolic Insulation Board & BunstockNoYesNoNo

*SNAP status for HFC-134a, HFC-245fa, and HFC-365mfc and other high GWP HFCs is listed as “Unacceptable” for polyurethane, polystyrene, polyolefin, and phenolic foams.

  1. Substitutes in Foam Blowing Agents. Available at epa.gov/snap/substitutes-foam-blowing-agents (Accessed 10 February 2021)