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Velostat , also known as Linqstat , is a packaging material made of a polymeric foil ( polyolefins ) impregnated with carbon black to make it somewhat electrically conductive . It is used for the protection of items or devices that are susceptible to damage from electrostatic discharge . ^[1] It was developed by Custom Materials, now part of 3M . ^[2] Velostat is a U.S. registered trademark (4,964,564) of Desco Industries Inc. Desco Industries purchased the assets of the 3M Static Control business on January 2, 2015. ^[3]

Velostat is piezoresistive ; its resistance changes with flexing or pressure . For instance, 25 mm ² of 0.2 mm fresh Velostat sandwiched between two electrodes has a resistance around 9 k Ω without any force applied, but only 1 kΩ when 3 Newtons of force is applied. For material that has been used, those resistances are roughly halved. ^[4]

Velostat's low cost and piezoresistive properties have made it popular for making inexpensive flex or pressure sensors for microcontrollers . One example is shoes which light up when the wearer steps. Since Velostat's resistance is reduced when pressure is applied, a voltage divider measuring that resistance can indicate when weight is applied or removed from the shoes. ^[5]

References [ edit ]

^ Drake, N. (1996). Polymeric Materials for Electrostatic Applications . Rapra Technology. p. 131. ISBN 978-1-85957-076-0 .
^ Mims, Forrest M. (2000). Mims Circuit Scrapbook . Newnes. p. 69. ISBN 978-1-878707-49-9 .
^ "3M Completes Sale of Static Control Business to Desco Industries Inc" . 3M News | United States . Archived from the original on 2018-07-02 . Retrieved 2018-05-15 .
^ Dzedzickis, Andrius; Sutinys, Ernestas; Bucinskas, Vytautas; Samukaite-Bubniene, Urte; Jakstys, Baltramiejus; Ramanavicius, Arunas; Morkvenaite-Vilkonciene, Inga (2020). "Polyethylene-Carbon Composite (Velostat®) Based Tactile Sensor" . Polymers . 12 (12): 2905. doi : 10.3390/polym12122905 . ISSN 2073-4360 . PMC 7761878 . PMID 33287414 .
^ "Pressure-Sensitive Conductive Sheet (Velostat/Linqstat)" . adafruit.com . Retrieved 12 February 2015 .

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