Blu Tack is a reusable putty-like pressure-sensitive adhesive produced by Bostik, commonly used to attach lightweight objects (such as posters or sheets of paper) to walls, doors or other dry surfaces. Traditionally blue, it is also available in other colours. Generic versions of the product are also available from other manufacturers. The spelling now used is without a hyphen.
The composition is described as a synthetic rubber compound without hazardous properties under normal conditions. It can be swallowed without harm and is not carcinogenic. It is non-soluble and is denser than water. The material is not flammable, but emits carbon dioxide and carbon monoxide when exposed to fire or high temperatures.
Blu Tack was originally developed in 1969 as an accidental by-product of an attempt to develop a new sealant using chalk powder, rubber and oil. The name of the inventor is unknown. Originally Blu Tack was white, but consumer research showed fears that children may mistake it for chewing gum, and a blue colouring was added.
In the United Kingdom in March 2008, 20,000 numbered packs of pink Blu Tack were made available, to help raise money for Breast Cancer Campaign, with 10 pence from each pack going to the charity. The formulation was slightly altered to retain complete consistency with its blue counterpart. Since then, many coloured variations have been made, including red and white, yellow and a green Halloween pack.
Similar products of various colours are made by many manufacturers, including Faber-Castell's "Tack-it", Henkel's "Fun-Tak", UHU's "Poster Putty" and "Sticky Tack", "Gummy Sticker" Pritt's "Sticky Stuff", Bostik's "Prestik" and Elmer's "Poster Tack". Plasti-Tak by Brooks Manufacturing Company appears to pre-date Blu Tack, with a trademark registration in 1964.
Versions of the product are also sold under the generic names "adhesive putty" and "mounting putty". The generic trademark or common name for mounting putty varies by region. It is known as "Patafix" in France, Italy, and Portugal, Kennaratyggjó ("teacher's chewing gum") in Iceland, Häftmassa ("attachment paste") or kludd in Sweden, and wondergom in South Africa (an Afrikaans word, literally translated as "wonder glue").
Blu Tack can be used as a damping agent for sound and vibration applications, due to its low amplitude response properties. A 2013 study concluded that the substance is a comfortable alternative to over-the-counter ear plugs for the attenuation of everyday sound.
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- "Safety Data Sheet Bostik Blu Tack" (PDF). Archived from the original (PDF) on 2015-05-09. Retrieved 2014-12-02.
- Ward, James (2015). Adventures in Stationery (paperback ed.). London: Profile Books. p. 213. ISBN 978-1-84668-616-0.
- Ward, James (2015). Adventures in Stationery (paperback ed.). London: Profile Books. pp. 213–214. ISBN 978-1-84668-616-0. (Statements on the internet suggesting that Blu Tack was invented by somebody called ‘Alan Holloway’ all appear to derive from an unsourced 2007 edit to this page, since removed).
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- "ERASING PENCIL with BLU-TACK wall putty at MIKE SIBLEY FINE ART". sibleyfineart.com. Retrieved 2019-09-19.
- tulpastudios Elizabeth Thompson. "Elizabeth Thompson Blu Tack spider | Flickr – Photo Sharing!". Flickr. Retrieved 2012-01-31.
- "The Sound of Surprise (the loudspeaker/stand interface)". Stereophile.com.