Ⅰ Brief instruction：
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4500PA/PB is two-component Polyurethane casting system, have the properties of good thermal shock resistance, excellent electric properties, and low water absorption.
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Ⅱ Product Data：
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Item
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Method
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4500PA
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4500PB
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Appearance
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Visual
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Light Yellow Liquid
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Black Viscous Liquid
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Viscosity
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25℃ mpa·s
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100±50
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3000±500
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Density
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25℃ g/ml
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1.20±0.05
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1.50±0.05
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Shelf-life
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R.T.
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6 months
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6 months
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Ⅲ Work Process:
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Item
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Unit or Condition
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4500PA/PB
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Mixing Proportion
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Weight Proportion
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16～17:100
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Pot life*
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25℃，min
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20～30
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Curing Schedule
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℃/hrs
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60/3～4 or 25/24
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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：
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Item
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Unit or Condition
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4500PA/PB
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Hardness
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Shore-D/Shore-A, 25℃
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40±5/75±10
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Volume resistivity
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25℃，Ω·cm
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>1×1014
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Water Absorption
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24h, 25℃，%
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<0.3
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Tensile strength Tear elongation
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Mpa
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>3
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Surface resistivity
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Ω
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>1×1014
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Dielectric strength
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50HZ at 23℃,kV/mm
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> 20
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Combustibility
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UL-94
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V-0
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Tear elongation
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100％
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> 50
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Application temperature range＃
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℃
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-40～130(Class B)
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＃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.
