also: anti-static bag, ESD bag
Velostat is a piezoresistive material, meaning it’s electrical resistance decreases when pressured. When sandwiched between two conductive layers, it has a wonderful range for making pressure and bend sensors. It can also be used for resistive sensing over distance, position sensing.
Velostat is a back, opaque, volume-conductive, carbon-impregnated polyolefin. The electrical characteristics are not affected by age or humidity (but they do change when melted under the iron).
Velostat is the brand name for this material manufactured by 3M. Linqstat is the same thing, just manufactured by another company, Caplinq. This is also the material from which the black anti-static storage bags for sensitive electrical components are made. Although not all anti-static electronics bags have the same piezoresistive properties as Velostat! From experience we have found that silver and transparent bags are not pressure sensitive, and unfortunately not all black bags are either. But your chances are high, if the bag is black. Bring your multimeter to the store and maybe you can test them before you buy them.
It is also used to make helmets to protect against alien abduction.
Anti-Static Plastic Bag Links
>> http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=320843661626 (UK, thanks to Tom S. for this link)
>> http://www.huebner-elektronik.de/ (Anti-static Lagebeutel, Erfurt, Germany)
Suppliers ofand Linqstat
>> http://www.lessemf.com/plastic.html (New Jersey, USA)
>> http://www.caplinq.com/blog/linqstat-volume-conductive-film-for-emf-shielding_37/ (Canada)