White polyester film is used for solar battery back materials.
Properties
Units
Typical Values
Methods
Thickness
TD
μm
125
188
250
DIN53370
Tensile Strength
MD
N/mm²
165
150
ASTM D882
200
210
215
Elongation
%
135
140
160
96
98
110
E Module
/
Light transmittance
92
99
100
ASTM D1003
Haze
65
58
53
Heat shrinkage 150℃/30min
1.0
BMSTT11
0
-0.1
Wetting tension
mN/m
ASTM D2578
Frequency electric strength
V/um
≥90
≥85
≥70
GB12802.2-2004
Water vapor rate
g/m².24