黄色青青在线,98久久在线

Properties

Melting point:: −97 °C(lit.)

Boiling point:: 39.8-40 °C mm Hg(lit.)

Density: 1.325 g/mL at 25 °C(lit.)

vapor density: 2.9 (vs air)

vapor pressure: 24.45 psi ( 55 °C)

refractive index: n20/D 1.424(lit.)

solubility: Slightly soluble (1.38 g/100 mL) in water at 20°C; soluble in carbon tetrachloride; miscible in ethanol, diethyl ether and dimethylformamide (Lide, 1995; Budavari, 1996)

form: Liquid

color: Colorless to yellow

Relative polarity: 0.309

Odor: penetrating ether-like odour

Odor Threshold: The odour threshold of dichloromethane is about 200 ppm [694 mg/m3] (Stahl,1973).

Stability:: Vapour is nonflammable and is not explosive when mixed with air (Budavari, 1996) but may form explosive mixtures in atmospheres with higher oxygen content (Sax, 1984)

Safety Information

Symbol(GHS): GHS07,GHS08

Signal word: Warning

Hazard statements: H315-H319-H336-H351

Precautionary statements: P201-P302+P352-P305+P351+P338-P308+P313

Hazard Codes: Xn

Risk Statements: 40

Safety Statements: 23-24/25-36/37

RIDADR: UN 1593

WGK Germany: 2

RTECS: PA8050000

F: 3-10

HazardClass: 6.1

PackingGroup: III

Use

Methylene chloride is used principally as a solvent in paint removers. It is also used as an aerosol propellant, processing solvent in the manufacture of steroids, antibiotics, vitamins, and tablet coatings; as a degreasing agent; in electronics manufacturing; and as a urethane foamblowing agent. Methylene chloride is also used in metal cleaning, as a solvent in the production of polycarbonate resins and triacetate fibers, in film processing, ininkformulations, and as anextraction solvent for spice oleoresins, caffeine, and hops. It was once registered for use in the United States as an insecticide for commodity fumigation of strawberries, citrus fruits, and a variety of grains. Methylene chloride has been used as a blowing agent for foams and as a solvent for many applications, including coating photographic films, pharmaceuticals, aerosol formulations, and to a large extent in paint stripping formulations. It is used as a solvent in a number of extraction processes, where its high volatility is desirable. It has high solvent power for cellulose esters, fats, oils, resins, and rubber, and is more water soluble than most other chlorinated solvents. Formulations for paint stripping may contain other solvents as well as methylene chloride and are frequently found outside the workplace. These formulations often contain other ingredients that retard evaporation and in the process increase the likelihood of skin irritation.