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ⅠDescription
WL-700A/B is
heat-cured encapsulating epoxy resin. They consist of
main agent, curing agent and DF-090 light diffusing
agent. The main compositions are electronic class low
viscosity epoxy resin, additive, acid anhydride, and
light diffusing filler. Following are their main
features:
1.
Low mixing viscosity, good degassing
characteristics. |
 |
2.
long pot life at room temperature, rapidly curing at
medium temperature.
3.
Outstanding mechanical, physical properties and low
shrinkage rate after curing.
4.
Good transparency after curing.
Ⅱ.Product
data
|
Item |
Test method or condition |
WL-700A |
WL-700B |
|
Appearance |
Visual inspection |
Light purple liquid |
Colorless liquid |
|
Density |
25℃
g/cm3 |
1.1-1.2 |
1.1-1.2 |
|
Viscosity |
40℃
cPs |
800-1300 |
30-50 |
|
Shelf life |
Room temperature, ventilation |
1 year |
1 year |
Ⅲ.
Working condition
|
Item |
Unit or condition |
WL-700A/B |
|
Mixing
proportion |
Ratio of weight |
100:95-100 |
|
Application time
period |
25℃,35g,h |
>4 |
|
Curing condition |
℃/h |
75-80/7-8 |
1.
Recommended quantity(in weight)of diffusing agent and
color paste to be used with WL-700A/B:
PC-002 2-5%
PC-003 1-3%
PC-004 2-4%
Diffusing agent 2-5%
2.
Before use,WL-700A is to be pre-warmed to 50℃,
then add WL-700B in mixing ratio and mix them thoroughly.
3.
The mixture (A+B)is to be vacuum degassed at 3 torr and
40℃.
When the liquid level sinks for 10-15 minutes stop degassing.
4.
If possible encapsulation should be carried out in
vacuum.
5.
If light-diffusing agent DF-090 or color paste is to be
used, the quantity of material B has to be increased to an
amount of one half of the quantity of DF-090 or color paste.
Ⅳ.Applications
Suitable for display
panel and opto-electronic elements.
Ⅴ.Characteristics
after curing
|
Items |
Unit or condition |
WL-700A/B |
|
Hardness |
Shore-D |
>88 |
|
Volume
resistivity |
25℃,Ω·cm |
>1015 |
|
Surface
resistance |
25℃,Ω |
>1014 |
|
Insulation
strength |
25℃,KV/mm |
>23 |
|
Linear expansion
coefficient |
cm/cm/℃ |
<6.0×10-5 |
|
Water absorption |
100℃/1h,% |
<0.4 |
|
Tg value |
℃ |
>100 |
Ⅵ.Storage,
transportation and points to note
1.
This product does not belong to dangerous article. It can
be stored and transported in the way as common chemicals do. The
shelf life is designated in the container.
2.
Take precise note of the type of the product, put it in
place properly. Weigh it precisely and make a thoroughly mixing.
3.
Material B is liable to absorb moisture, the lid of the
container must be tightly covered after use.
Ⅶ.Packing
Packed in 6-kg
plastic container.
Ú Note: The
data above are typical tested at a relative humidity of 70 % and
a temperature of 25℃.
They are just for customers’ reference. We cannot wholly
guarantee all the listed data will be reached under specific
test conditions. When applying the product, the customers should
use data obtained through their own testing.
