The chemical substance under consideration is tert-Butyl methyl ether, a member of the Ethers group, with a Molecular Weight of 88.15 g/mol. This compound, identified by the CAS Number 1634-04-4, is classified as a Reference Substance for Gas Chromatography (GC) within the category of Natural & Reference Materials. In the workplace, it requires specific safety measures such as wearing safety goggles and gloves, prohibiting open flames, and setting up no-admittance zones for unauthorized personnel. The recommended occupational exposure limit values, according to Directive 2009/161/EU, are 8 hours limit value: 183.5 mg/m3 (50 ppm), and short term limit value: 367 mg/m3 (100 ppm).

• CAS Number: 1634-04-4
• Molecular Formula: C5H12O
• Molecular Weight: 88.15
• Exact Mass: 88.088815002
• Boiling Point: 131.4 °F at 760 mmHg (USCG, 1999)
• Melting Point: -164.2 °F (USCG, 1999)
• Density: Relative Vapour Density (air = 1): 3.0
• GHS Signal Word: Danger
• Hazard Statements:
• H225: Highly Flammable liquid and vapor [Danger Flammable liquids]