There is a pungent smell.
The usual concentration in the market is about 47%, and the mass fraction of solute can reach 35.35%. Highly toxic.
The highest density is 1. 14g/cm3, and the boiling point is 393. 15K( 120℃).
Strong corrosiveness, serious damage to teeth and bones.
It is very corrosive to silicon compounds.
It should be kept in a closed plastic bottle.
Used for carving glass, cleaning residual sand on castings, controlling fermentation, electropolishing and cleaning corroded semiconductor silicon wafers (mixed with HNO3 acid).
Danger, protection and emergency treatment
Health hazard: It has a strong corrosive effect on the skin. In the initial stage of burn, the skin is red and dry. The wound is pale and necrotic, then purple-black or gray-black. Deep burns or improper treatment can form deep ulcers that are difficult to heal and damage periosteum and bones. This product has severe burn pain. Eye contact with high concentration of this product will cause corneal perforation. Contact with its vapor can cause bronchitis, pneumonia and so on.
Chronic effects: irritation to eyes and upper respiratory tract, or nosebleed and insensitivity. There will be tooth decay. X-ray abnormality of bones and industrial fluorosis are rare.
Explosion hazard: This product is nonflammable, highly toxic, corrosive and irritating, and can cause burns to human body.
Skin contact: Take off contaminated clothes immediately and rinse with plenty of running water for at least 15 minutes. See a doctor.
Eye contact: lift the eyelid immediately and rinse it thoroughly with plenty of flowing water or normal saline for at least 15 minutes. See a doctor.
Inhalation: leave the scene quickly and go to a place with fresh air. Keep the respiratory tract unobstructed. If you have difficulty breathing, give oxygen. If breathing stops, give artificial respiration immediately. See a doctor.
Intake: rinse your mouth with water and give milk or egg white. See a doctor.
Danger characteristics: This product is nonflammable, but it can react with most metals to generate hydrogen, causing explosion. When it meets H, the foaming agent will burn immediately. Very corrosive.
Harmful combustion products: hydrogen fluoride.
Fire extinguishing method: fire extinguishing agent: atomized water and foam.
Emergency treatment: quickly evacuate the personnel in the leaked and polluted area to a safe area, isolate them, and strictly restrict access. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and acid-proof overalls. Don't touch the leak directly. Cut off the leakage source as much as possible.
Small amount of leakage: mixed with sand, dry lime or soda ash. It can also be washed with plenty of water, diluted and put into the wastewater system. A large number of leaks: damming or digging holes to contain them. Pump it into a tank car or a special collector with a pump, and recycle it or transport it to a waste disposal site for treatment.
Precautions for operation: close the operation and pay attention to ventilation. The operation should be as mechanized and automated as possible. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter gas mask (full face mask), rubber acid and alkali resistant clothing and rubber acid alkali resistant gloves. Prevent the steam in the workplace from leaking into the air. Avoid contact with alkali, active metal powder and glass products. When handling, handle with care to prevent the packaging and containers from being damaged. Equipped with leakage emergency treatment equipment. Empty containers may leave harmful substances behind.
Respiratory system protection: Wear self-priming filter gas mask (full face mask) or air respirator when it is possible to come into contact with its smoke. It is recommended to wear an oxygen respirator during emergency rescue or evacuation.
Eye protection: respiratory protection has been done.
Physical protection: Wear rubber acid and alkali resistant clothes.
Hand protection: Wear rubber acid alkali resistant gloves.
Other protection: Smoking and eating are prohibited in the workplace. Take a shower and change clothes after work. Store clothes contaminated by poisons separately and wash them for later use. Maintain good hygiene habits.