Ⅰ Brief instruction
：
|
4500A(-1)/4500B(-1)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
|
4500A(-1)
|
4500B (-1)
|
|
Appearance
|
Visual
|
Brown Liquid
|
Black
Viscous Liquid
|
|
Viscosity
|
25℃
mpa·s
|
100±50
|
3000±1000
|
|
Density
|
25℃
g/ml
|
1.20±0.05
|
1.55±0.05
|
|
Shelf-life
|
R.T. Sealed
|
6 months
|
6 months
|
Ⅲ Work Process:
|
Item
|
Unit or Condition
|
4500A(-1)/4500B (-1)
|
|
Mixing Proportion
|
Weight Proportion
|
50
：
100
|
|
Mixing Viscosity
|
25℃
mpa·s
|
1000±300
|
|
Mixing Density
|
25
℃
，g/ml
|
1.40±0.05
|
|
Pot life*
|
60℃
，
min
|
>60
|
|
Curing Schedule
|
℃/h
|
60/3
~
4
或
25/48
|
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
|
Unit or Condition
|
4500A(-1)/4500B (-1)
|
|
Hardness
|
Shore-D
|
75±5
|
|
Volume resistivity
|
25℃
，
Ω·cm
|
＞
1013
|
|
Water Absorption
|
24h, 25℃
，
%
|
<0.3
|
|
Flammability
|
UL94
，
1/16in
|
V-0
|
|
Dielectric strength
|
25
℃
，
KV/mm
|
＞
20
|
|
Tear elongation
|
%
|
200±50
|
Ⅶ Storage
：
Store the components in a dry place at 5-35℃,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
：
20Kg
or 25kg Metal Container
※
Remarks:
The above technical data are typical product data at 70% humidity and 25 degree C, for customer reference only.
