French chalk

French chalk

French chalk is a type of talc used by tailors for marking cloth, by cleaners for removing grease from cloth and as a dry lubricant in its powdered form.

French chalk is also an essential ingredient required for the repair of punctured inner tubes of pneumatic tires, such as are found on bicycles. A block of French chalk is typically included in proprietary puncture repair kits. These kits typically include some means of generating a fine powder from the block, for example a small file or a roughened area on the metal case in which the repair kit may have been supplied.

To repair a puncture, the relatively fragile inner tube is removed from its normal location inside the tire. The puncture is identified by inflation of the inner tube whilst it is held under water. The site of the puncture is identified by a stream of bubbles. After marking the site of the puncture and drying the inner tube, a patch is secured over the puncture using a suitable adhesive. A fine dusting of French chalk is then applied to the same region to prevent adhesion of the inner tube to the inner surface of the tire after it has been replaced and inflated to the correct pressure.Fact|date=May 2008


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Look at other dictionaries:

  • French chalk — Chalk Chalk (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as… …   The Collaborative International Dictionary of English

  • French chalk — French French (fr[e^]nch), prop. a. [AS. frencisc, LL. franciscus, from L. Francus a Frank: cf. OF. franceis, franchois, fran[,c]ois, F. fran[,c]ais. See {Frank}, a., and cf. {Frankish}.] Of or pertaining to France or its inhabitants. [1913… …   The Collaborative International Dictionary of English

  • French chalk — n. a very soft soapstone chalk used for marking lines on cloth or removing grease spots …   English World dictionary

  • French chalk — French′ chalk′ n. clo a talc for marking lines on fabrics • Etymology: 1720–30 …   From formal English to slang

  • French chalk — noun a soft white compact talc used to mark cloth or to remove grease stains • Hypernyms: ↑talc, ↑talcum * * * noun Usage: usually capitalized F : a soft white granular variety of steatite used as a grease remover in dry cleaning or for drawing… …   Useful english dictionary

  • French chalk — /frɛntʃ ˈtʃɔk/ (say french chawk) noun a talc for marking lines on cloth, etc …  

  • French chalk — noun Date: circa 1728 a soft white granular variety of steatite used especially for drawing lines on cloth and for removing grease in dry cleaning …   New Collegiate Dictionary

  • French chalk — a talc for marking lines on fabrics. [1720 30] * * * …   Universalium

  • French chalk — noun A type of steatite, used to mark cloth and as a lubricant in shoes, gloves etc …   Wiktionary

  • french chalk — talc used on cloth by tailors to make marks on cloth; talc that cleaners use for removing grease stains from clothes …   English contemporary dictionary

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