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An unopened packet of Sugru silicone rubber.
Sugru used to repair damaged grip on camera. Textured using fiberglass mesh before curing was complete.
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.[3] Upon exposure to air, it cures to a rubber-like texture.


Sugru is malleable when removed from its airtight, moisture-proof packaging, retains its plasticity for thirty minutes,[4] and is self-curing at room temperature in 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, Sugru has a 'soft touch' or slightly flexible, grippable texture similar to features commonly found in soft overmolds. It is waterproof and dishwasher-safe,[5] and the material is thermally insulating, with a service temperature range between −50 and 180 °C (223 and 453 K).[2] Sugru is not resistant to isopropyl alcohol.[6] While early versions of the product had a short shelf-life, as of 2014, it was being advertised as staying fresh for 13 months from the date it was made.[7] According to the company, if kept in a refrigerator, the remaining shelf-life is tripled.[7]


The idea for Sugru was developed by Jane Ní Dhulchaointigh from Kilkenny, Ireland.[8][dead link] Ní Dhulchaointigh studied product design as a post-graduate research student at the Royal College of Art, where she conceived the idea for the substance in 2003 while 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 US$2 million, and a staff of 30.[12]

In May 2015, the company launched a campaign to raise £1 million (US$1350193.72) 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]

In December 2016, the company secured a further £4m investment from Clydesdale and Yorkshire Banks.[16]

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

Chemical compound[edit]

The formulation of Sugru contains 30% silicone (polysiloxane) 20–50% talc, and the remaining additives including: methyltris (methylethylketoxime) silane, γ-aminopropyltriethoxysilane, and dioctyltin dilaurate.[17] 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".[18] However, one report exists that it can cause an allergic reaction in uncured form.[19]

See also[edit]


  1. ^ "About". Sugru. Retrieved 2 December 2016. 
  2. ^ a b c Formeral® F.10/Sugru® Technical Data Sheet (PDF). FormFormForm Ltd. 2016. Retrieved 2 December 2016. 
  3. ^ "Sugru Moldable Glue - Black & White (Pack of 8)". Retrieved 22 December 2016. It feels like playdough straight out of the pack, 
  4. ^ Fitzpatrick, Jason (28 June 2010). "Sugru Moldable Silicone Is Perfect for DIY Ideas and Repairs". Lifehacker. Retrieved 29 July 2016. 
  5. ^ Sorrel, Charlie (1 December 2009). "Sugru, An Amazing Silicon Modeling Clay for Makers and Hackers". Wired. 
  6. ^ "Is sugru resistant to oil / petrol / solvents?". Archived from the original on 2012-07-22. Retrieved 2016-07-29. 
  7. ^ a b "About Sugru". 
  8. ^ a b "Kilkenny woman invents best thing since blu-Tack and Sellotape". Kilkenny People. 25 January 2010. Retrieved 6 February 2010. 
  9. ^ a b c "Wired meets the woman behind Sugru". Wired, Charlie Burton, 6 May 2010. 
  10. ^ Mullally, Una (17 January 2010). "Irish woman invents Sugru, 'the most useful item since Sellotape'". Sunday Tribune. Retrieved 6 February 2010. 
  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. 25 October 2012. 
  13. ^ "Sticky putty Sugru crowdfunds in bid to rival Sellotape and Blu-Tack worldwide". The Telegraph, Rebecca Burn-Callander, 25 May 2015. 25 May 2015. 
  14. ^ "Sugru overfunds within its first week". CrowdCube, Becca Lewis, 5 June 2015. 5 June 2015. 
  15. ^ "Sugru raising £1,000,000 investment on Crowdcube. Capital At Risk.". CrowdCube. 
  16. ^ Hunt, Gordon (21 December 2016). "Sugru secures £4m in funding for international expansion". Retrieved 22 December 2016. 
  17. ^ "FORMEROLsugru_MSDS_Oct09.pdf" (PDF). Sugru. December 2013. p. 1. Retrieved 9 December 2013. 
  18. ^ "About". Retrieved 22 September 2015. 
  19. ^ "Moderately severe systemic allergic reaction". GetSatisfaction. 27 June 2010. Archived from the original on 1 August 2010. Retrieved 22 September 2015. 

External links[edit]