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For the surname, see Sugrue.
An unopened packet of Sugru silicone rubber
A lump of uncured Sugru

Sugru (/ˈsɡr/[1]), also known as Formerol, is a patented[2] multi-purpose, non-slumping brand of silicone rubber that resembles modeling clay.


Sugru is malleable when removed from its airtight, moisture-proof packaging, retains its plasticity for thirty minutes,[3] and is self-curing at room temperature after approximately 24 hours. The material adheres to aluminium, steel, copper, ceramics, glass, fabric, brass, leather, plywood and other materials including ABS plastics.[2]

When cured, it has a 'soft touch' or slightly flexible, grippable texture similar to features commonly found in soft overmolds. It is waterproof and dishwasher-safe,[4] and the material is thermally insulating, with a service temperature range between −50 and 180 °C.[2] Sugru is not resistant to isopropyl alcohol.[5] While early versions of the product had a short shelf-life, as of June 2014 it will stay fresh for 13 months from the date it was made.[6][7] According to the product packaging, if you keep Sugru in a refrigerator, you can triple the number of months you have left before the use-by date.


The idea for Sugru was developed by Jane Ní Dhulchaointigh from Kilkenny, Ireland.[8] Ní Dhulchaointigh studied product design as a post-graduate research student at the Royal College of Art[8] where she conceived the idea for the substance in 2003 whilst using mixtures of standard silicone sealants and sawdust in her work.[9]

After receiving business grants,[10] Ní Dhulchaointigh worked with retired scientists from Dow Corning[11] and a silicone expert over a seven-year period[9] at the materials department at Queen Mary, University of London[9] to develop a silicone elastomer that was moldable, self-adhesive and self-curing. Her goal was to enable people "to easily and affordably repair, improve or customize things they already own."[11]

Sugru was developed by and is marketed by FormFormForm, a company in Hackney, London, with over 100,000 customers as of 2012, annual sales of $2 million, and a staff of 30.[12]

In May 2015, the company launched a campaign to raise £1 million on the crowdfunding site CrowdCube.[13] The company reached its £1 million funding target in just four days[14] and continued on to raise well over £3 million.[15]

The name Sugru derives from the Irish language word "súgradh" for "play".[8]

Chemical compound[edit]

The formulation of sugru contains 30% silicone caulk (polysiloxane) 20-50% talc, and the remaining additives including: methyltris (methylethylketoxime) silane, γ-aminopropyltriethoxysilane, and dioctyltin dilaurate.[16] The company claims its formulation can be varied to offer different levels of consistency, plasticity, softness, resiliency, surface adhesion, modulus and abrasion resistance, setting time, density, and ability to float.[citation needed]

The company claims that Sugru is classified under EU Health & Safety regulations[clarification needed] as "not dangerous",[17] but that it may cause an allergic skin reaction in uncured form.[18]

See also[edit]


  1. ^ "Sugru Q&A". Retrieved 14 December 2014. 
  2. ^ a b c "FORMEROL F.10 / sugru Preliminary technical data sheet" (PDF)., October 2009. 
  3. ^
  4. ^ Sorrel, Charlie (2009-12-01). "Sugru, An Amazing Silicon Modeling Clay for Makers and Hackers". Wired. 
  5. ^
  6. ^ "About Sugru". 
  7. ^ "Sugru: Our story". 
  8. ^ a b c "Kilkenny woman invents best thing since blu-Tack and Sellotape". Kilkenny People. 2010-01-25. Retrieved 2010-02-06. 
  9. ^ a b c "Wired meets the woman behind Sugru". Wired, Charlie Burton, 6 May 2010. 
  10. ^ Una Mullally (2010-01-17). "Irish woman invents Sugru, 'the most useful item since Sellotape'". Sunday Tribune. Retrieved 2010-02-06. 
  11. ^ a b "FormFormForm gets ready to launch the next big consumer adhesive brand"., 11 August 2009. 
  12. ^ "Sugru: A gripping tale of struggle and success". CNN, Nick Glass and Tom Levitt, 26 October 2012. 
  13. ^ "Sticky putty Sugru crowdfunds in bid to rival Sellotape and Blu-Tack worldwide". The Telegraph, Rebecca Burn-Callander, 25 May 2015. 
  14. ^ "Sugru overfunds within its first week". CrowdCube, Becca Lewis, 5 June 2015. 
  15. ^ "Sugru raising £1,000,000 investment on Crowdcube. Capital At Risk.". CrowdCube. 
  16. ^ "FORMEROLsugru_MSDS_Oct09.pdf" (PDF). Sugru. December 2013. p. 1. Retrieved 9 December 2013. 
  17. ^ "About". Retrieved 22 September 2015. 
  18. ^ "Moderately severe systemic allergic reaction". GetSatisfaction. 27 June 2010. Archived from the original on 8 October 2010. Retrieved 22 September 2015. 

External links[edit]