User Manual

Page 3
m/m
V/m
or
C/m
2
N/m
2
V
/
m
N
/
m
2
or
m
/
m
C
/
m
2
Table 1. Typical properties of piezo film
Symbol Parameter PVDF Copolymer Units
t Thickness 9, 28, 52, 110 <1 to 1200 µm (micron, 10
-6
)
d
31
Piezo Strain Constant
23 11
10
-12
d
33
-33 -38
g
31
Piezo Stress constant
216 162
10
-3
g
33
-330 -542
k
31
Electromechanical
Coupling Factor
12% 20%
k
t
14% 25-29%
C Capacitance 380 for 28µm 68 for 100µm pF/cm
2,
@ 1KHz
Y Young’s Modulus 2-4 3-5 10
9
N/m
2
V
0
Speed of
Sound
stretch:
thickness:
1.5 2.3
10
3
m/s
2.2 2.4
p Pyroelectric Coefficient 30 40 10
-6
C/m
2
bK
ε Permittivity 106-113 65-75 10
-12
F/m
ε/ε
0
Relative Permittivity 12-13 7-8
Mass Density 1.78 1.82 10
3
kg/m
ρ
m
Volume Resistivity >10
13
>10
14
Ohm meters
ρ
e
R
œ
Surface Metallization
Resistivity
<3.0 <3.0 Ohms/square for NiAl
0.1 0.1 Ohms/square for Ag Ink
R
œ
tan δ
e
Loss Tangent 0.02 0.015 @ 1KHz
Yield Strength 45-55 20-30 10
6
N/m
2
(stretch axis)
Temperature Range -40 to 80...100 -40 to 115...145
bC
Water Absorption <0.02 <0.02 % H
2
O
Maximum Operating
Voltage
750 (30) 750 (30) V/mil(V/µm), DC, @ 25bC
Breakdown Voltage 2000 (80) 2000 (80) V/mil(V/µm), DC, @ 25bC