Dichloromonofluoromethane Chemical Properties

Melting point:

-135°C

Boiling point:

8.9°C

Density 

1,354 g/cm³

vapor pressure 

1,216 at 11.8 °C (NIOSH, 1997)

refractive index 

1.3540

solubility 

Soluble in acetic acid, alcohol, and ether (Weast, 1986)

form 

Colorless gas

color 

Colorless liquid or gas with an ether-like odor

Water Solubility 

0.7 wt % at 30 °C (NIOSH, 1997)

Dielectric constant

5.3（28℃）

Exposure limits

NIOSH REL: TWA 10 ppm (40 mg/m³), IDLH 5,000 ppm; OSHA PEL: TWA 1,000 ppm (4,200 mg/m³); ACGIH TLV: TWA 10 ppm (adopted).

NIST Chemistry Reference

Methane, dichlorofluoro-(75-43-4)

EPA Substance Registry System

HCFC-21 (75-43-4)

Safety Information

Hazard Codes 

N

Risk Statements 

59

Safety Statements 

59

RIDADR 

1029

RTECS 

PA8400000

HazardClass 

2.2

Hazardous Substances Data

75-43-4(Hazardous Substances Data)

Toxicity

LC₅₀ (inhalation) for rats 49,900 ppm/4-h (quoted, RTECS, 1985).

IDLA

5,000 ppm

MSDS

• Language:English Provider:Fluorodichloromethane

Dichloromonofluoromethane Usage And Synthesis

Description

Dichlorofluoro-methane is a heavy, colorlessgas or liquid (below 9℃) with a slight ether-like odor.Molecular weight=102.92; Boiling point=9℃; Freezing/Melting point=2135℃; Relative vapor density (air-5 1)=3.57; Vapor pressure=1.6 atm at 25℃;Autoignition temperature=522℃. Hazard Identification(based on NFPA-704 M Rating System): Health 1,Flammability 0, Reactivity 0. Poor solubility in water;solubility=0.7% at 30℃.

Chemical Properties

Dichlorofluoromethane is a heavy, colorless gas or liquid (below 9C) with a slight ethereal odor.

Uses

Fire extinguishers; solvent; refrigerant.

Uses

Refrigerant gas; propellant gas

General Description

Dichloromonofluoromethane is a colorless, odorless gas. Dichloromonofluoromethane is shipped as a liquid under its own vapor pressure. Contact with the liquid may cause frostbite to unprotected skin. Dichloromonofluoromethane can asphyxiate by displacement of air. Exposure of the container to prolonged heat or fire may cause Dichloromonofluoromethane to rupture violently and rocket.

Air & Water Reactions

Slightly soluble in water.

Reactivity Profile

Dichloromonofluoromethane is incompatible with the following: Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium; acid; acid fumes .

Health Hazard

INHALATION: May cause giddiness, light-headedness, disorientation, nausea, vomiting, narcosis, cardiac dysrhythmias, hypotension, and death. SKIN: May cause frostbite or irritation. EYES: May cause irritation or cold injury.

Fire Hazard

Special Hazards of Combustion Products: Toxic fumes of chlorine and fluorine may be produced in fire.

Safety Profile

Mildly toxic by inhalation. Experimental reproductive effects. When heated to decomposition it emits very toxic fumes of Cl and F-.

Potential Exposure

This material is used as a refrigerant and a propellant gas.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit. Iffrostbite has occurred, seek medical attention immediately;do NOT rub the affected areas or flush them with water. Inorder to prevent further tissue damage, do NOT attempt toremove frozen clothing from frostbitten areas. If frostbitehas NOT occurred, immediately and thoroughly wash contaminated skin with soap and water.

Environmental Fate

Chemical/Physical. The experimental hydrolysis half-life of dichlorofluoromethane in water at 25 °C and pH 7 is 234 yr (Jeffers and Wolfe, 1996).

storage

Color Code—Green: General storage may be used.Prior to working with dichloromonofluoro-methane you shouldbe trained on its proper handling and storage. Store in tightlyclosed containers in a cool, well-ventilated area away fromchemically active metals, acids, acid fumes, alkali and alkalineearth metals, since violent reaction occur. Procedures for thehandling, use, and storage of cylinders should be in compliance with OSHA 1910.101 and 1910.169, as with the recommendations of the Compressed Gas Association.

Shipping

UN1029 Dichlorofluoromethane or Refrigerant gas R-21 Hazard Class: 2.2; Labels: 2.2-Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.

Incompatibilities

Reacts violently with chemically active metals: sodium, potassium, calcium, powdered aluminum; zinc, magnesium, alkali, alkaline earth. Reacts with acids or acid fumes producing highly toxic chlorine and fluorine fumes. Attacks some forms of plastics, rubber, and coatings.

Waste Disposal

Return refillable compressed gas cylinders to supplier. Incineration, preferably after mixing with another combustible fuel. Care must be exercised to assure complete combustion to prevent the formation of phosgene. An acid scrubber is necessary to remove the halo acids produced. Because of recent discovery of potential ozone decomposition in the stratosphere, this material should be released to the atmosphere only as a last resort

Dichloromonofluoromethane(75-43-4)Related Product Information

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• Dichloromethane
• Trifluoromethyl iodide
• HEXAFLUORO-1,1,3,4-TETRACHLOROBUTANE
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• 1,1-DICHLOROTETRAFLUOROETHANE
• TOLYLFLUANID
• FLUOROPENTACHLOROETHANE
• Dichloromonofluoromethane
• Difluoromethane
• Dichlorofluoroethane
• Dichlorodifluoromethane
• BROMOTRIFLUOROMETHANE
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• 1,3-DIFLUOROTETRACHLOROACETONE
• 1,1,3-TRICHLOROTRIFLUOROACETONE
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