May security knowledge go deep into people’s hearts and allow limited space accidents to become less and less frequent

Yesterday, Xiao Bian saw a video saying that a worker puts on ordinary medical masks to clean up toxic tanks. The screenshots are as follows:


After reading this video, Xiao Bian also collected some information on dichloroethane:

Dichloroethane Concept Dichloroethane (Chemical Formula: C2H4Cl2; Cl(CH2)2Cl, formula weight: 98.97), which is orthodichloroethane, is a kind of halogenated hydrocarbon, and it is usually represented by DCE. A colorless or light yellow transparent liquid has a melting point of -35.7°C, a boiling point of 83.5°C, a density of 1.235 g/cm3, and a flash point of 17°C. It is a colorless chloroform-like liquid at room temperature, toxic and potentially carcinogenic. Used as a solvent and manufacturing, trichloroethane intermediates. It is used as a solvent for waxes, fats, rubbers, and grain pesticides.
The hazardous properties of dichloroethane are classified as Class A flammable and explosive substances. Its vapor and air form an explosive mixture, which causes a combustion explosion in the event of an open flame or high heat energy. It can react with oxidants. Decomposed by high temperatures produces toxic corrosive gases. Its vapour is heavier than air, and it can spread to relatively far places in the lower part of the fire. In case of high heat, the internal pressure of the container increases, causing cracking and explosion. Corrosion of plastic and rubber. Flammability (red): 3 Reactivity (yellow): 0 Combustion (decomposition) Product: carbon monoxide, carbon dioxide, hydrogen chloride, phosgene. Fire extinguishing methods: foam, dry powder, carbon dioxide, sand, water spray. If the substance or the contaminated fluid enters the waterway, notify the downstream users who have potential water pollution to inform the local health and fire officials and the pollution control department.
Dichloroethane Toxic Hazard Exposure Limits: China MAC: Not established Standard Soviet Union MAC: 10mg/m3 US TWA: OSHA 100ppm, 405mg/m3; ACGIH 200ppm, 810mg/m3 US STEL: ACGIH 250ppm, 1010mg/m3
Invasive route: Inhalation Ingestion Percutaneous Absorption
Health hazards: Anesthetic effect. Inhalation, ingestion or absorption through the skin is harmful to the body, inhalation of a certain concentration can cause kidney damage, repeated inhalation can cause liver damage. It has irritating effects on the skin and causes dermatitis. Its vapor or smoke can irritate the eyes, mucous membranes and respiratory tract. IDLH: 3000ppm Olfactory Threshold: 255ppm OSHA: Table Z-1 Air Contaminant Health Hazard (Blue): 2
Carcinogenicity: IARC Carcinogenicity Review: Animals are positive and humans are suspicious.
Mutagenicity: Occupational exposure causes chromosomal aberrations in human peripheral blood lymphocytes.
Environmental hazards: The substance is very destructive to the atmospheric ozone layer.
Truly ignorant fearless, like to clean up such limited space tanks with toxic gases, it is necessary to go with a full set of protective measures to enter, Xiao Bian organize the following, I hope everyone can spread, so that more people to understand their side The danger is that knowing which supplies to use can avoid the hazard.
Dichloroethane protective measures 1 The project controls the production process to be closed and enhances ventilation.
2 Respiratory protection When the concentration in the air exceeds the limit, gas masks should be worn. When emergency rescue or escape, wear self-contained breathing apparatus. NIOSH/OSHA1000ppm: Air Supply Respirator. 2500ppm: continuous air supply respirators. 3000ppm: Self-contained respirator, full-facepiece respirator. Emergency or planned access to areas of unknown concentration, or immediate life or health hazards: self-contained positive pressure full face respirator, air supply positive pressure full face respirator assisted with self-contained positive pressure respirator. Escape: An air-purifying full-face respirator (gas mask) with an organic vapor cartridge and a self-contained escape breathing apparatus.
3 Eye protection Wear chemical safety glasses.
4 Protective clothing Wear appropriate protective clothing.
5 hands Protection Wear chemical-resistant gloves when necessary.
6 Other workplaces prohibit smoking, eating and drinking. After work, take a shower and change clothes. Pay attention to personal hygiene.
Dichloroethane First aid measures Skin contact: Remove contaminated clothing and rinse thoroughly with soap and water. Be aware that the patient is warm and quiet. Inhalation, ingestion, or skin contact with this material can cause delayed reactions. Ensure that medical personnel understand the relevant personal protective knowledge of the substance and pay attention to its own protection.
Eye contact: Immediately lift eyelids and rinse with flowing water.
Inhalation: quickly from the scene to fresh air. Keep the airway open. Give oxygen when breathing is difficult. When breathing stops, take artificial respiration immediately and seek medical attention.
Ingestion: Persons who swallowed by mistake gave a lot of warm water, induced vomiting, and gastric lavage. Get medical attention.

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