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NiTi • Nitinol SMA Muscle Foil Shape Memory Alloy

  • $ 4.70

Nitinol foil video - see it in action

1x2 and 2x2 inch nitinol foil sheets, activated using hot water from the faucet.

Nitinol nickel titanium inter-metallic (superalloy) with a 50ºC phase transition temperature. The sheet is 0.1mm thick, maximum dimensions are 150mm • 300mm. It is priced per square inch. You can specify whether you want strip or rectangle in the notes at checkout.

The foil is very strong and puncture resistant. It will return to original / trained shape when heated to approx. 50ºC or above. Heating past 100ºC is not recommended or necessary unless you are setting a new shape.

To save you frustration, some advice:

"The foil is quite different from wire, and your expectations should not be the same. The foil will crease if you bend it too much. It is best to cool it to 10ºC or below before bending as it will become much more flexible. You should be able to recognize the difference between yield that it gives you and permanent deformation when bending the foil. If you only deform it, cool, when it yields, it will reward you with a pleasant surprise when you heat it."

Transition temp 50ºC. In stock. Simple ordering. Worldwide shipping.



The video below depicts 2mm diameter NiTi 80ºC transition phase dropped in 95ºC hot water. The ending is 1/16 speed. Turn up the sound.


Transition Temperatures

Nitinol changes its crystalization pattern at more than 1 temperature point. The stoichiometric ratio of Ni to Ti, impurities, and post-processing determine the mechanical characteristics of your nitinol.

All transition temperatures are specified in Celsius ºC. The temp indicated is an approximation of where the alloy begins to undergo the crystalline transformation. It occurs over a fairly wide temperature range. So, a 40C rated wire will perform faster and stronger at 80C.

At room temperature, an 80C wire will be substantially more malleable and soft to your fingers, the 40C will be more difficult to bend, and the 15C will feel like spring steel. The 15C will react to a heat source up to 80C, while 80C NiTi is more suitable for exposure up to 150C. The 15C will be malleable at and below freezing temperatures.


Return Transition Phase

A common question concerns the ability of the alloy to transition back to its cold shape upon cooling (double dipping). This alloy will exhibit a slight mechanical effect upon cooling, however it does not exhibit nearly the same level of energy as upon heating. The effect is most noticeable in the 15C wire however is mildly present in all of these alloys.


Purchase Options 

  • The price indicated is per square inch (2.54cm2).
  • The largest possible length is 12 inches and the maximum possible width is 6 inches.
  • To order the largest uncut sheets possible, order in multiples of 72.
  • You can indicate in the notes at checkout if you wants strips or rectangles when ordering multiple quantities. Multiple quantities ship uncut, but maximum length is 12 inches and maximum width is 6 inches.
  • Don't hesitate to contact us if you have questions.

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