dichloromethane
2024-08-14 10:20:29  Click through rate: 188

Table of Physical and Chemical Properties and Hazardous Characteristics of Dichloromethane

Chemical name

Chinese name: 二氯甲烷 English name: Dichloromethane Hazardous code: 61552 UN number: 1593

Molecular formula: CH2Cl2 Molecular weight: 84.94 CAS number: 75-09-2 Hazard category: Class 6.1 Toxic substances


Hazard Overview

Health hazards: This product has anesthetic effects and mainly damages the central nervous system and respiratory system. Acute poisoning: Mild cases may experience dizziness, headache, vomiting, and irritation of the eyes and upper respiratory mucosa; Severe cases may exhibit excitability, gait instability, ataxia, and drowsiness, which can lead to chemical bronchitis. Severe cases may result in coma and pulmonary edema. The content of carboxyhemoglobin in the blood increases. Chronic effects: Long term exposure mainly includes headaches, fatigue, dizziness, decreased appetite, sluggish movements, drowsiness, etc. It has a degreasing effect on the skin, causing dryness, flaking, and cracking.

Explosive hazard: This product is flammable, toxic, and irritating.

Emergency measures

Skin contact: Remove contaminated clothing and thoroughly rinse the skin with soap and water.

Eye contact: Lift the eyelids and rinse with flowing water or saline solution. Seek medical attention.

Inhalation: Quickly leave the scene and move to a place with fresh air. Keep the respiratory tract unobstructed. If breathing is difficult, administer oxygen. If breathing stops, immediately perform artificial respiration. Seek medical attention.

Ingestion: Drink plenty of warm water and induce vomiting. Seek medical attention.


Fire protection measures

Hazardous characteristics: When in contact with open flames or hot objects, it can produce highly toxic phosgene. When exposed to humid air, it can hydrolyze to produce trace amounts of hydrogen chloride, and light can also promote hydrolysis and enhance the corrosiveness of metals.

Harmful combustion products: carbon monoxide, carbon dioxide, hydrogen chloride, phosgene.

Fire extinguishing method: Firefighters must wear gas masks and full body firefighting suits, and extinguish the fire in the upwind direction. Spray water to cool the container, and if possible, move the container from the fire scene to an open area. Extinguishing agent: fog water, foam, carbon dioxide, sand.


Emergency response to leakage

Quickly evacuate personnel from the contaminated area to a safe zone, isolate them, and strictly restrict their entry and exit. Cut off the fire source. It is recommended that emergency responders wear self-contained positive pressure respirators and protective clothing. Cut off the leakage source as much as possible. Prevent the flow into restricted spaces such as sewers and drainage ditches. Minor leakage: Absorb or absorb with sand or other non combustible materials. Massive leakage: Construct embankments or dig pits to contain it. Cover with foam to reduce steam disaster. Transfer to a tanker or dedicated collector using a pump, and recycle or transport to a waste disposal site for disposal.


Handling and Storage

Precautions for operation: Closed operation, local exhaust. Operators must undergo specialized training and strictly adhere to operating procedures. It is recommended that operators wear direct gas masks (half face masks), chemical safety goggles, work clothes that prevent toxic substances from penetrating, and chemical resistant gloves. Keep away from sources of fire and heat, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent steam leakage into the workplace air. Avoid contact with alkali metals. Handle with care during transportation to prevent damage to packaging and containers. Equip with corresponding types and quantities of fire-fighting equipment and emergency response equipment for leaks. Empty containers may contain residual harmful substances.

Storage precautions: Store in a cool and ventilated warehouse. Stay away from sources of fire and heat. The storage temperature shall not exceed 30 ℃, and the relative humidity shall not exceed 80%. Keep the container sealed. It should be stored separately from alkali metals and edible chemicals, and avoid mixing storage. Equip with corresponding types and quantities of fire-fighting equipment. The storage area should be equipped with emergency response equipment for leaks and suitable containment materials.


Contact control and individual protection

Exposure limit: China: 200 Former Soviet Union: 50

Engineering control: Closed operation, local exhaust

Respiratory protection: When the concentration in the air exceeds the standard, a direct gas mask (half face mask) should be worn. Wear an air respirator during emergency rescue or evacuation. Eye protection: If necessary, wear chemical safety goggles. Body protection: Wear work clothes that prevent toxic substances from penetrating. 

Hand protection: Wear chemical resistant gloves. 

Other protections: Smoking, eating, and drinking are prohibited at the work site. After work, take a shower and change clothes. Store clothes contaminated with toxic substances separately and wash them for later use. Pay attention to personal hygiene and cleanliness.


Physical and chemical properties

Appearance and characteristics: Content: Industrial grade Grade 1 ≥ 99.0%; Level 2 ≥ 98.0%. Colorless transparent liquid with an aromatic odor. 

Melting point (℃): -96.7 Boiling point (℃): 39.8 Flash point (℃): No data available Saturated vapor pressure (kPa): 30.55 (10 ℃)

Combustion heat (kJ/mol): 604.9 Ignition temperature (℃): 615 Critical temperature (℃): 237 Critical pressure (MPa): 6.08

Relative density (water=1): 1.33 Relative vapor density (air=1): 2.93 Explosion limit% (V/V): 19~12

Main use: Used as a solvent in the resin and plastic industry. Solubility: Slightly soluble in water, soluble in ethanol and ether.


Stability and reactivity

Prohibited substances: alkali metals, aluminum. Conditions to avoid contact: light exposure


Toxicological data

LD50: 1600-2000 mg/kg (oral administration in rats) LC50: 88000mg/m3, 1/2 hour (inhalation in rats)

Irritation: Rabbit eye passage: 162mg, moderate irritation. Rabbit transdermal: 810mg/24 hours, severe irritation.


Transportation information

Packaging method: Small opening steel drum; Ordinary wooden box outside the ampoule bottle; Screw mouth glass bottles, iron cap pressed mouth glass bottles, plastic bottles, or ordinary wooden boxes outside metal drums (cans); Threaded glass bottles, plastic bottles, or tin plated steel drums (cans) are filled with bottom plate flower boxes, fiberboard boxes, or plywood boxes.

Transportation precautions: Before transportation, the packaging container should be checked for completeness and sealing. During transportation, it is necessary to ensure that the container does not leak, collapse, fall, or damage. It is strictly prohibited to mix with acids, oxidants, food, and food additives during transportation. Transport vehicles should be equipped with corresponding types and quantities of fire-fighting equipment and emergency response equipment for leaks during transportation. During transportation, it should be protected from direct sunlight, rain, and high temperatures. During road transportation, it is necessary to follow the prescribed route.



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