Liquid ammonia

Liquid ammonia is a colorless liquid with a strong pungent smell. As an important chemical raw material, ammonia is usually compressed or cooled to obtain liquid ammonia for the convenience of transportation and storage.

Sulfoxide chloride

Sulfoxide chloride, an inorganic compound, is a colorless or yellow odorous liquid with a strong pungent smell. It can be miscible with benzene, chloroform, carbon tetrachloride and other organic solvents, hydrolyzed in water and decomposed by heating. It is mainly used to produce acyl chloride, and also used in the production of pesticides, pharmaceuticals, dyes, etc.

Paraformaldehyde

Polyoxymethylene (POM), also known as acetal resin, polyoxymethylene, and polyacetal, is a thermoplastic crystalline polymer, known as "Super Steel" or "Saigang".

Bromine

Bromine, the only non-metallic substance in liquid state at room temperature, is a dark reddish brown liquid with pungent smell, and is classified as the second category of precursor chemicals

Potassium hydroxide

Potassium hydroxide (chemical formula: KOH, formula weight: 56.11) white powder or flake solid. Melting point 360~406 ℃, boiling point 1320~1324 ℃, relative density 2.044g/cm, flash point 52 ° F, refractive index n20/D1.421, vapor pressure 1mmHg (719 ℃). It is strongly alkaline and corrosive. It can easily absorb moisture in the air and deliquescence, and absorb carbon dioxide to form potassium carbonate. Dissolve in about 0.6 parts hot water, 0.9 parts cold water, 3 parts ethanol and 2.5 parts glycerin. When dissolved in water, alcohol or treated with acid, a lot of heat is generated. The pH of 0.1mol/L solution is 13.5. Medium toxicity, median lethal dose (rat, oral) 1230mg/kg. Soluble in ethanol, slightly soluble in ether. It is extremely alkaline and corrosive, and its properties are similar to caustic soda.

Hydrochloric acid

Hydrochloric acid is an aqueous solution of hydrogen chloride (HCl), which is widely used in industry. Hydrochloric acid is colorless and transparent liquid with strong pungent smell and high corrosivity. Concentrated hydrochloric acid (with a mass fraction of about 37%) is highly volatile, so hydrogen chloride gas will volatilize after the container containing concentrated hydrochloric acid is opened, which will combine with water vapor in the air to produce small drops of hydrochloric acid, causing acid mist above the bottle mouth.