| | Dichloromonofluoromethane Basic information |
| | 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) | | 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). | | Dielectric constant | 5.3（28℃） | | NIST Chemistry Reference | Methane, dichlorofluoro-(75-43-4) | | EPA Substance Registry System | HCFC-21 (75-43-4) |
| 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 |
| | 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 | Refrigerant gas; propellant gas | | Uses | Fire extinguishers; solvent; refrigerant. | | 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 Preparation Products And Raw materials |
|