Sugru (//), also known as Formerol, is a patented multi-purpose, non-slumping brand of silicone rubber that resembles modelling clay. 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, 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.
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, 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). Sugru is not resistant to isopropyl alcohol. 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. According to the company, if kept in a refrigerator, the remaining shelf-life is tripled.
The idea for Sugru was developed by Jane Ní Dhulchaointigh from Kilkenny, Ireland. 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.
After receiving business grants, Ní Dhulchaointigh worked with retired scientists from Dow Corning and a silicone expert over a seven-year period at the materials department at Queen Mary, University of London 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".
In May 2015, the company launched a campaign to raise £1 million (US$1,333,333.33) on the crowdfunding site CrowdCube. The company reached its £1 million funding target in just four days and continued on to raise well over £3 million.
The formulation of Sugru contains 25-50% silicone (polysiloxane), 25–50% talc, and the remaining additives including methyltris (methylethylketoxime) silane and (3-aminopropyl)triethoxysilane. 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.
According to the company's MSDS for the U.S., Sugru is classified as "not hazardous" under OSHA's 2012 Hazard Communication Standard, 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. However, both versions of the MSDS note that Sugru may cause irritation or skin sensitization.
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