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Benzalkonium chloride （CAS 8001-54-5) is colorless liquid  and also known as BZK, BKC, BAC, alkyldimethylbenzylammonium chloride and ADBAC, is a type of cationic surfactant. It is an organic salt called a quaternary ammonium compound. It has three main categories of use: as a biocide, a cationic surfactant, and as a phase transfer agent. BKC is a mixture of alkylbenzyldimethylammonium chlorides, in which the alkyl group has various even-numbered alkyl chain lengths.

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Application

4)  Oil & gas industry: strong biocide and algicide ability, to prevent pipe from being blocked and rusted.

5)  Medicine: Benzalkonium chloride is a frequently used preservative in eye drops; typical concentrations range from 0.004% to 0.01%. Stronger concentrations can be caustic and cause irreversible damage to the corneal endothelium.

6) Benzalkonium chloride is an active ingredient in many consumer products:
    Pharmaceutical products such as eye, ear and nasal drops or sprays, as a preservative
    Personal care products such as hand sanitizers, wet wipes, shampoos, deodorants and cosmetics
    Skin antiseptics, such as Bactine and Dettol
    Some disinfectant solutions, such as post-piercing ear disinfectants.
    Throat lozenges and mouthwashes, as a biocide
    Spermicidal creams
    Over-the-counter single-application treatments for herpes, cold-sores, and fever blisters, such as RELEEV and Viroxyn
    Burn and ulcer treatment
    Spray disinfectants for hard surface sanitization
    Cleaners for floor and hard surfaces as a disinfectant, such as Lysol

    Algaecides for clearing of algae, moss, lichens from paths, roof tiles, swimming pools, masonry, etc.

7) Benzalkonium chloride is also used in many non-consumer processes and products, including as an active ingredient in surgical disinfection. A comprehensive list of uses includes industrial applications. An advantage of benzalkonium chloride, not shared by ethanol-based antiseptics or hydrogen peroxide antiseptic, is that it does not cause a burning sensation when applied to broken skin.

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