5 Feet Nitinol Shape Memory Pre-trained Wire (1.0mm 40 C (18ga 104 F))

If you bend it too severely, it will just break off.

This arrived ahead of schedule and well packaged (although it is fairly indestructible so just an address label would probably have sufficed). BTW The online tracking provided by the carrier was very misleading. I received 31cm of 1mm diameter wire. When bent and then put in boiling water it straightened so I clearly got what I had ordered (I suspect the 40degC it stated was a bit out. The bag indicates a 10degC tolerance and I think my bit transitions closer to 50-60 C) However, this is sold as muscle wire - the clear implication being that the main use-case is for it to be electrically heated. My foot of it appears to have a resistance of about half an ohm. Using a bench power supply with a current limit it needs about 2v / 4a to slowly get warm (at which it does seem to transition), so i would comment that this format is not ideal for use as an electrical actuator. A thinner version would be much more convenient for the voltage / current regime likely to be present in the average project. Otherwise some sort of step down with chunky switching transistors and big inductors/capacitors is going to be needed. Along with much bigger restoration forces. It is nice that it is provided in arbitrary lengths and that there are cool options available. since i ordered mine, they have started doing half the diameter which is likely better, though still a bit low resistance.

Exactly as advertised. Great for the prices especially. Much stronger than expected.

Sensitivity for temperature is low.

Worked great as a science experiment with the kids. Reacts really fast in just warm water. ...so fast you its just a blur as it snaps straight.

Pretty cool wire. It was fun to show the kids.

received what was advertised

Se me ocurrió tirar agua hirviendo encima y del salto que pego lo he perdido, voy a pedir otro porque me he quedado con ganas de mas.

Came as described. Very fun to play with!

Je connais le Nitinol, mais jattendais de cet achat une notice explicative pour savoir comment pré-contraindre une forme. Là, rien ! Un sachet plastique, avec le fil à lintérieur et dem..dez vous. Aucune info sur les températures de contrainte et celle de retour à la forme contrainte. Très déçu.