From Wikipedia, the free encyclopedia

Typeadhesive repair putty
InventorJane Ní Dhulchaointigh
Inception2003 (2003)
Sugru used to repair a damaged camera grip, with texture achieved by impressing fibreglass mesh before curing was complete

Sugru (/ˈsɡr/[1]), also known as Formerol, is a patented[2] multi-purpose, non-slumping brand of silicone rubber that resembles modelling clay.[3] It is available in several colours and upon exposure to air, 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 (between -58 and 356 °F or 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.[8]


The idea for Sugru was developed by Jane Ní Dhulchaointigh from Kilkenny, Ireland.[9] 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.[10]

After receiving business grants,[11] Ní Dhulchaointigh worked with retired scientists from Dow Corning[12] and a silicone expert over a seven-year period[10] at the materials department at Queen Mary, University of London[10] to develop a silicone elastomer that was mouldable, self-adhesive and self-curing. Her goal was to enable people "to easily and affordably repair, improve or customise things they already own".[12]

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.[13]

In May 2015, the company launched a campaign to raise £1 million (US$1,280,000) on the crowdfunding site CrowdCube.[14] The company reached its £1 million funding target in just four days[15] and continued on to raise well over £3 million.[16]

In December 2016, the company secured a further £4m investment from Clydesdale and Yorkshire Banks.[17]

The name Sugru derives from the Irish language word "súgradh" for "play".[9]

In May 2018, FormFormForm was acquired by German adhesive company Tesa SE, a subsidiary of Beiersdorf.[18]

Chemical compound[edit]

The formulation of Sugru contains 25-50% silicone (polysiloxane), 25–50% talc, and the remaining additives including methyltris (methylethylketoxime) silane and (3-aminopropyl)triethoxysilane.[19] 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]

According to the company's MSDS for the U.S., Sugru is classified as "not hazardous" under OSHA's 2012 Hazard Communication Standard,[19] and for Europe, Sugru "does not meet the criteria for classification in any hazard class" under EU Regulation No. 1272/2008 and Directive 1999/45/EC.[20] However, both versions of the MSDS note that Sugru may cause irritation or skin sensitization.

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 22 July 2012. Retrieved 29 July 2016.
  7. ^ "About Sugru".
  8. ^ "Technology Sugru".
  9. ^ a b "Kilkenny woman invents best thing since blu-Tack and Sellotape". Kilkenny People. 25 January 2010. Archived from the original on 1 February 2010. Retrieved 6 February 2010.
  10. ^ a b c "Wired meets the woman behind Sugru". Wired, Charlie Burton, 6 May 2010.
  11. ^ Mullally, Una (17 January 2010). "Irish woman invents Sugru, 'the most useful item since Sellotape'". Sunday Tribune. Archived from the original on 25 January 2010. Retrieved 6 February 2010.
  12. ^ a b "FormFormForm gets ready to launch the next big consumer adhesive brand"., 11 August 2009.
  13. ^ "Sugru: A gripping tale of struggle and success". CNN, Nick Glass and Tom Levitt, 26 October 2012. 25 October 2012.
  14. ^ "Sticky putty Sugru crowdfunds in bid to rival Sellotape and Blu-Tack worldwide". The Telegraph, Rebecca Burn-Callander, 25 May 2015. 25 May 2015.
  15. ^ "Sugru overfunds within its first week". CrowdCube, Becca Lewis, 5 June 2015. 5 June 2015.
  16. ^ "Sugru raising £1,000,000 investment on Crowdcube. Capital At Risk". CrowdCube.
  17. ^ Hunt, Gordon (21 December 2016). "Sugru secures £4m in funding for international expansion". Retrieved 22 December 2016.
  18. ^ O'Brien, Ciara (17 May 2018). "Investors in Sugru lose up to 90% of their money". The Irish Times. Retrieved 25 May 2018.
  19. ^ a b "Sugru / FORMEROL F.10 Safety Data Sheet (US)" (PDF). FormFormForm. May 2015. p. 1. Retrieved 12 October 2017.
  20. ^ "Sugru / FORMEROL F.10 Safety Data Sheet (EU)" (PDF). FormFormForm. July 2015. p. 1. Retrieved 12 October 2017.

External links[edit]