R21 refrigerant, dichloro-monofluoromethane, colorless and transparent liquid. Insoluble in water, soluble in ether, ethanol, chloroform. It has a similar smell of carbon tetrachloride, is non-corrosive, and has stable chemical properties. It does not burn, but decomposes into HCI, HF in the flame, and may also contain phosgene. used asrefrigerant, solvent, aerosol propellant
Physical property parameters of R21 refrigerant
| Abbreviations: R21 HCFC-21 F21 | Chinese name: dichloromonofluoromethane, monofluoromethane |
| English full name: dichlorofluoromethane | Chemical molecular formula: CHCl2F |
| CAS Number: 75-43-4 | Classification: Pure matter |
| Molecular weight: 102.9227 | Molar mass: 102.9227g/mol |
| Triple point temperature: -130.35℃ | Standard boiling point (101.3KPa): 8.86℃ |
| Critical temperature: 178.33℃ | Critical pressure: 5.1812MPa (absolute pressure) |
| Critical density: 526.01379461912kg/m3 | Eccentricity factor: 0.2061kJ (kg*℃) |
| Dipole moment: 1.37D (Debye) | Freezing point (melting point):-135℃ |
| Refractive index: 1.3724 (9℃) | Hazard sign: 5(non-combustible gas) |
| Relative water density of liquid: 1.405 (9℃) | Relative air density 3.82 (27℃, 101.3KPa |
R21 technical indicators
indicator name | superior grade product |
appearance | Colorless and non-turbid |
smell | There is no difference in stench |
Purity, %, ≥ | 99.8 |
Moisture, %, ≤ | 0.001 |
Acidity (in HCI), %, ≤ | 0.00001 |
Evaporation residue, %, ≤ | 0.01 |
R21 Packaging specifications:
Net weight 10kg, 400kg, etc.
Impact of R21 on the environment
1.health hazard
Route of invasion: Inhalation.
Health hazard: It has a rapid suffocation effect. Inhalation at high concentrations can cause disorientation, nausea, vomiting, anesthesia, arrhythmia, hypotension, and even death.
2.Toxicological information and environmental behaviour
Acute toxicity: LD50210000mg/m3,4 hours (rat inhalation)
Hazard characteristic: Non-flammable. When exposed to fire or red heat, the surface will decompose into highly toxic hydrogen chloride, hydrogen fluoride, and may also contain phosgene. In case of high heat, the internal pressure of the container will increase and there is a risk of cracking and explosion.
Combustion (decomposition) products: carbon monoxide, carbon dioxide, hydrogen fluoride, hydrogen chloride.
Emergency treatment and disposal methods
1.spill response
Quickly evacuate personnel from the leaking contaminated area to the windward, isolate them, and strictly restrict access. It is recommended that emergency response personnel wear self-contained positive pressure respirators and general work clothes. Cut off the source of the leak as much as possible. Reasonable ventilation will accelerate diffusion. If possible, use it immediately. Leaky containers should be properly handled and used before being repaired and inspected.
2.protective measures
Respiratory protection: Generally no special protection is required. Wear a self-priming filter gas mask (half mask) when exposed to high concentrations。
Eye protection: Generally no special protection is required.
Physical protection: Wear general work clothes.
Hand protection: Wear general working protective gloves.
Other: Avoid inhalation at high concentrations. When entering tanks, restricted spaces or other high-concentration areas, someone must be supervised.
3.first aid measures
Inhalation: Quickly leave the scene to a place with fresh air. Keep the airway open. If breathing is difficult, give oxygen. If breathing stops, immediately perform artificial respiration. Seek medical treatment.
Fire extinguishing method: This product is non-combustible. Cut off the air supply. Spray water to cool the container and, if possible, move the container from the fire to an open space.
