US Dept of Labor

Occupational Safety & Health AdministrationWe Can Help

Regulations (Preambles to Final Rules) - Table of Contents
• Record Type: Occupational Exposure to Methylene Chloride
• Section: 4
• Title: Section 4 - IV. Chemical Identification

IV. Chemical Identification

Methylene chloride (MC), also called dichloromethane (DCM) [Chemical Abstracts Service Registry Number 75-09-2] is a halogenated aliphatic hydrocarbon with a chemical formula of CH(2)Cl(2), a molecular weight of 84.9, a boiling point of 39.8 deg. C (104 deg. F) at 760 mm Hg, a specific gravity of 1.3, a vapor density of 2.9 and a vapor pressure of 350 mm Hg at 20 deg. C (68 deg. F). Concentration of MC in saturated air at 25 deg. C reaches 550,000 ppm. MC has low water solubility (1.3 gm per 100 gm of water at 20 deg. C), an extensive oil and fat solubility, and a low flammability potential. It is used as a flame suppressant in solvent mixtures (lower explosive limit of 12% and upper explosive limit of 19%). It is a colorless volatile liquid with a chloroform-like odor and its odor threshold varies between 100 and 300 ppm. Contact with strong oxidizers, caustics and active metal powder may cause explosions and fires. Decomposition products during combustion or fire include phosgene, hydrogen chloride and carbon monoxide.

[62 FR 1494, January 10, 1997]

Regulations (Preambles to Final Rules) - Table of Contents

Thank You for Visiting Our Website

You are exiting the Department of Labor's Web server.

The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Users must request such authorization from the sponsor of the linked Web site. Thank you for visiting our site. Please click the button below to continue.

Close