Can the SMART layer be used in the high humidity and/or aggressive chemical environment?
Generally, the piezoelectric materials and polyimide used in the SMART Layer do not have a very good durability at high humidity or aggressive chemical environment. Protective coating or encapsulation is recommended if the layer is used in high humidity or aggressive chemical environment. Protective coatings and finishes for the SMART Layer used in these environments have been fully studied at Acellent under the support of US Army. Test results showed that there is no signal change after 168-hour exposure to 100% humidity at 120ºF and ASTM B 117 salt fog exposure 336 hours, Per MIL-STD-810F.
