Electrostatic protection, to prevent the static-sensitive parts from damage of
static charges.
Transparent for easy viewing inner contents.
Resistivity : Exterior layer 1 x 109Ω/ square x 0.012 mm.
Middle metallic layer 1 x 102Ω/ square x 0.002 mm.
Interior layer 1 x 109Ω/ square x 0.086 mm.