Bio-based Backsheet for Solar Modules
Provisional Data Sheet: BioBacksheetTM-C
(March 31, 2009)
BioBacksheetTM-C is essentially a green material designed
for use as a photovoltaic backsheet. It
is a two component system comprising of a substrate and a top layer. The substrate is a cellulosic film produced
from cotton, and the coating is a proprietary material intended to lower the
water vapor transmission rate and to make the outer surface of the product more
abrasion resistant.
BioBacksheetTM-C: Properties
Material Configuration
|
Cellulosic
film with a water resistant coating
|
Property
|
English
|
Metric
|
Thickness
|
7
mils
|
178
µm
|
Width
|
up
to 50 in
|
up
to 1270 mm
|
Basis Weight
|
0.00375
lb/ft2
|
183
g/m2
|
Density
|
75
lb/ft3
|
1.2
g/cm3
|
Color
|
Natural
light grey. Other Colors are
available by
special order
|
Tensile Strength (MD/TD)
|
14,000/6,200
psi
|
980
/ 434 kg/cm2
|
Elongation at Break (MD/TD)
|
11.3
% / 9.7 %
|
Thermal
Shrinkage (MD/TD) 150oC@30 min
|
<1.0%
/ <1.0 %
|
Peel Strength of EVA Encapsulant
|
Cohesive
Failure only
|
Water Vapor Transmission Rate
|
0.14
gm/100 in2 day
|
2.2
gm/m2 day
|
Partial Discharge Voltage
|
TBD
|
Breakdown
Voltage
|
TBD
|
Wet HiPot Test (UL 1703)
|
PASS
|
The above figures are typical
values and do not represent an actual specification.
Bio-based Backsheet for Solar Modules
Provisional Data Sheet: BioBacksheetTM-L
(March
31, 2009)
BioBacksheetTM-L is essentially a green material designed
for use as a photovoltaic backsheet. It
is a two component system comprising of a substrate and a top layer. The substrate is a cellulosic film produced
from cotton, and the top layer is a Nylon based material intended to lower the
water vapor transmission rate and to make the outer surface of the product more
abrasion resistant.
BioBacksheetTM-L: Properties
Material Configuration
|
Cellulosic
film with a water resistant top layer
|
Property
|
English
|
Metric
|
Thickness
|
10
mils
|
254
µm
|
Width
|
up
to 50 in
|
up
to 1270 mm
|
Basis Weight
|
0.00536
lb/ft2
|
262
g/m2
|
Density
|
75
lb/ft3
|
1.2
g/cm3
|
Color
|
Natural
light grey. Other Colors are
available by
special order
|
Tensile Strength (MD/TD)
|
8,600
/ 7,700 psi
|
600
/ 540 kg/cm2
|
Elongation at Break (MD/TD)
|
5.2%
/ 6.2 %
|
Thermal
Shrinkage (MD/TD) 150oC@30 min
|
<1.0%
/ <1.0 %
|
Peel Strength of EVA Encapsulant
|
Cohesive
Failure only
|
Water Vapor Transmission Rate
|
0.18
gm/100 in2 day (TBD)
|
2.9
gm/m2 day (TBD)
|
Partial
Discharge Voltage
|
TBD
|
Breakdown Voltage
|
>12,000
Volts (TBD)
|
Wet HiPot
Test (UL 1703)
|
PASS
|
The above figures are typical
values and do not represent an actual specification.
|