4500PA/PB Polyurethane casting system

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.

Product Data

Item

Method

4500PA

4500PB

Appearance

Visual

Light Yellow Liquid

Black Viscous Liquid

Viscosity

25 mpa·s

100±50

3000±500

Density

25g/ml

1.20±0.05

1.50±0.05

Shelf-life

R.T.

 6 months

6 months

Work Process:

Item

Unit or Condition

4500PA/PB

Mixing Proportion

Weight Proportion

1617:100

Pot life*

25℃,min

2030

Curing Schedule

/hrs

60/34 or 25/24

l        Time to reach 5000 mPa·s

Application

Used for casting of electric unit such as transformers, capacitorsfilters etc

Work method:

a)      PreheatingThe unit preheat at 70~80℃for 1~2hour to remove humidity

b)      MixingWeight A and B by mix ratio and mix thoroughly;

c)      DegassingDegas the mixture B by vacuum;

d)      castingCast the degassed mixture into the preheated unit

Properties of Cured System

Item

Unit or Condition

4500PA/PB

Hardness

Shore-D/Shore-A, 25℃

40±5/75±10

Volume resistivity

25Ω·cm

>1×1014

Water Absorption

24h, 25℃%

<0.3

Tensile strength Tear elongation

Mpa

>3

Surface resistivity

Ω

>1×1014

Dielectric strength

50HZ at 23℃,kV/mm

> 20

Combustibility

UL-94

V-0

Tear elongation

100

> 50

Application temperature range

-40130(Class B)

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.

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

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.

 

 

 

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