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  2. Laboratory rubber stopper - Wikipedia

    en.wikipedia.org/wiki/Laboratory_rubber_stopper

    A laboratory rubber stopper or a rubber bung or a rubber cork is mainly used in chemical laboratories in combination with flasks and test tube and also for fermentation in winery. [ 1 ] [ 2 ] [ 3 ] Generally, in a laboratory , the sizes of rubber stoppers can be varied up to approximately 16 sizes and each of it is specific to certain type of ...

  3. Vacutainer - Wikipedia

    en.wikipedia.org/wiki/Vacutainer

    A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid. Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing.

  4. Black market - Wikipedia

    en.wikipedia.org/wiki/Black_market

    A black market in Shinbashi in 1946 Illegal street traders in Barcelona in 2015. A black market [a] is a clandestine market or series of transactions that has some aspect of illegality, or is not compliant with an institutional set of rules. If the rule defines the set of goods and services whose production and distribution are prohibited or ...

  5. Toilet cleaner - Wikipedia

    en.wikipedia.org/wiki/Toilet_cleaner

    Toilet cleaner is sprayed around the rim and into the bowl of the toilet prior to the use of the toilet brush. The toilet brush is used to scrub the toilet, removing stubborn stains and biological debris. In recent times, automatic toilet bowl cleaners that clip onto the rim of the toilet and clean with every flush have also become prevalent.

  6. In-tank toilet cleaning tablet - Wikipedia

    en.wikipedia.org/wiki/In-tank_toilet_cleaning_tablet

    Many plumbers, manufacturer of toilets, and other professionals discouraged in-tank toilet cleaning products due to major disadvantages. [8] A major complication that may occur includes bleach breaking down rubber gaskets and corroding steel parts. [9] Another issue is the blue dye commonly used in in-tank cleaning tablets may cover up iron ...

  7. Butyl rubber - Wikipedia

    en.wikipedia.org/wiki/Butyl_rubber

    Butyl rubber gloves. Butyl rubber, sometimes just called "butyl", is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for isobutylene isoprene rubber. Polyisobutylene, also known as "PIB" or polyisobutene, (C 4 H 8) n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is ...

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