Wireless Sensing Based on RFID and Capacitive Technologies for Safety in Marble Industry Process Control

Table 1

Relative dielectric permittivity of different materials.

Material	Dielectric permittivity, 𝜀𝑟
Bianco Carrara	5.7
Rosa Portogallo	6.8
Pietra di Trani	13.8
Granito Grigio	29.9
Pietra del Cardoso	9.2
Ceramics	4.3–6.7
Plastic (PVC, Plexiglass)	2-3