Ⅰ
Brief instruction：
4500PA/PB is two-component Polyurethane casting
system, have the properties of good thermal shock
resistance, excellent electric properties, and low
water absorption.
|
Ⅱ
Product Data：
|
Item |
Method |
|
4500PB |
|
Appearance |
Visual |
Light Yellow Liquid |
Black Viscous Liquid |
|
Viscosity |
25℃
mpa·s |
100±50 |
3000±500 |
|
Density |
25℃
g/ml |
1.20±0.05 |
1.50±0.05 |
|
Shelf-life |
R.T. |
6 months |
6 months |
Ⅲ
Work Process:
|
Item |
Unit or Condition |
|
|
Mixing Proportion |
Weight Proportion |
16～17:100 |
|
|
25℃，min |
|
|
|
℃/hrs |
60/3～4
or 25/24 |
l
Time to
reach 5000 mPa·s
Ⅳ
Application：
Used for casting of electric unit such as
transformers, capacitors、filters
etc。
Ⅴ
Work method:
a)
Preheating：The
unit preheat at 70~80℃for 1~2hour to remove humidity；
b)
Mixing：Weight
A and B by mix ratio and mix thoroughly;
c)
Degassing：Degas
the mixture B by vacuum;
d)
casting：Cast
the degassed mixture into the preheated unit。
Ⅵ
Properties of Cured System：
|
Item |
|
|
|
Hardness |
Shore-D/Shore-A,
25℃ |
40±5/75±10 |
|
Volume resistivity
|
25℃，Ω·cm |
>1×1014 |
|
Water Absorption |
24h, 25℃，% |
<0.3 |
|
Tensile strength Tear elongation |
Mpa |
|
|
Surface resistivity
|
Ω |
|
|
Dielectric strength
|
50HZ at
23℃,kV/mm |
|
|
Combustibility
|
UL-94 |
|
|
Tear elongation |
100％ |
|
|
Application temperature range＃ |
℃ |
|
＃Max
working temperature is considered according the available
laboratory information. The final use temperature must be
considering the thermal class of all other used components
for construction of final device.
Conformity to
B class has been valuated according to IEC 60216 / IEC
60085.
Ⅶ
Storage：
Store the components in a dry place at 18-25℃,in tightly
sealed original containers. Under these conditions, the
shelf life will correspond to the expiry date stated on the
Label. After this date, the product may be processed
only after reanalysis. Partly emptied containers should be
tightly closed immediately after use
Ⅷ
Packing：
25Kg or 20kg Metal Container
※
Remarks:
The above technical data are typical product data at 70%
humidity and 25 degree C, for customer reference only.
These properties have been determined by the methods shown
above and only valid for standard test specimen.
