Methyl t-Butyl Ether
Solvent Properties

CAS 1634-04-4

Physical Properties  
Molecular weight 88.14
Boiling point 55.2C
Vapor pressure 240 Torr at 20C
Freezing point -108.6C
Refractive index 1.3689 at 20C
Density 0.7405 g/mL (6.179 lb/gal) at 20C
  0.7358 g/mL (6.140 lb/gal) at 25C
Dipole moment 1.32 D at 25C
Solvent group 1
Polarity index (P') 2.5
Eluotropic value on alumina 0.3-0.4
Viscosity 0.27 cP at 20C
Surface tension 19.4 dyn/cm at 24C
Solubility in water 4.8% at 20C
Solubility of water in methyl t-butyl ether 1.5% at 20C
Regulatory and Safety Data  
DOT Proper Shipping Name Methyl tert-Butyl Ether
DOT Hazard Class 3, Flammable Liquid
Packing Group II
UN Identification Number UN2398
Storage Store in an area designed for flammable storage, or in an approved metal cabinet, away from direct sunlight, heat and sources of ignition.
EPA applicable waste code(s) D001
Flash point -18F (-27C) by closed cup
Lower explosive limit 2.5%
Upper explosive limit 15.1%
Time Weighted Average 40 ppm ACGIH
Peroxide hazard Very resistant to peroxide formation, but check for presence of peroxides before concentrating.

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