Ferric chloride is a covalent compound. Chemical formula: FeCl3. Also known as ferric trichloride, is a dark brown crystal, but also thin, melting point 306 C, boiling point 315 C, soluble in water, strong water absorption, can absorb moisture in the air and make it delirium. The orange crystals of ferric sulfate hexahydrate and ferric chloride hexahydrate were dissolved in aqueous solution of ferric sulfate hexahydrate and ferric chloride hexahydrate. Ferric chloride is an important iron salt.

　　主要用于金屬蝕刻及污水處理，包括銅、不銹鋼、鋁等材料的蝕刻。低油度原水處理具有效果好、低的優點，但也帶來了水發黃的缺點。還用于印染輥筒雕刻、電子工業線路板和熒光數碼管的生產。建筑行業常用配制混凝土來增強其強度、耐腐蝕和耐水性。還可與氯化亞鐵、氯化鈣、氯化鋁、硫酸鋁、鹽酸等防水劑配制成泥漿混凝土，用于無機工業生產其他鐵鹽和油墨。染料工業被用作染料染料染色的氧化劑。印染工業被用作媒染劑。在冶金工業中用作提取金銀的氯化劑。有機工業被用作催化劑、氧化劑和氯化劑。玻璃工業被用作玻璃器皿的熱著色劑。肥皂工業被用作從肥皂廢液中回收甘油的凝結劑。

　　Mainly used for metal etching and sewage treatment, including copper, stainless steel, aluminum and other materials etching. Low oil content raw water treatment has the advantages of good effect and low price, but it also brings the shortcoming of yellowing. It is also used for printing and dyeing roller engraving, circuit board and fluorescent digital tube production in electronic industry. Concrete is commonly prepared in the construction industry to enhance its strength, corrosion resistance and water resistance. It can also be mixed with waterproofing agents such as ferrous chloride, calcium chloride, aluminium chloride, aluminium sulfate and hydrochloric acid to make mud concrete, which can be used in inorganic industry to produce other iron salts and inks. The dyestuff industry is used as an oxidant for dyeing dyes. The printing and dyeing industry is used as mordant. It is used as chlorinating agent for extracting gold and silver in metallurgical industry. Organic industry is used as catalyst, oxidant and chlorinating agent. The glass industry is used as a thermal colorant for glassware. The soap industry is used as a coagulant to recover glycerol from waste soap liquor.

　　氯化鐵的另一個重要用途是五金蝕刻，蝕刻產品有:眼鏡架、鐘表、電子元器件、銘牌等。

　　Another important use of ferric chloride is metal etching. Etching products include spectacle frames, clocks and watches, electronic components, nameplates, etc.