FAQ: Direction of polarity

For some applications it is crucial to know the direction of polarisation, and thereby be able to control the direction of displacement generated by the applied voltage. The indication of polarity can be specified by the customer, but there are a few "standard" methods, which are widely used within the industry. The most normal way to indicate the direction of polarisation is to apply a small ink dot on the positive side of the part. If a positive electrode is connected to the side with the ink dot the part it will therefore expand in the polarisation direction and contract in the direction perpendicular to this. Ferroperm has furthermore introduced a colour code, whereby it is possible to identify different material types. Product Ceramic colour  Ink dot Pz21 Light green Purple Pz23 Light yellow Red Pz24 Grey Red Pz26 Grey Black Pz27 Yellow Green Pz28 Grey Purple Pz29 Light yellow Blue Pz34 Black Green Pz35 White Black Pz46 Beige Red

Ferroperm Piezoceramics A/S Hejreskovvej 18A DK-3490 Kvistgård Tel.: +45 49 12 71 00; Fax: +45 49 13 81 88 e-mail: pz@ferroperm-piezo.com