4500A (-1)/4500B (-1) Polyuret

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

50100

Mixing Viscosity

25℃ mpa·s

1000±300

Mixing Density

25℃g/ml

1.40±0.05

Pot life*

60℃min

>60

Curing Schedule

℃/h

60/3~425/48

l        Time to reach 5000 mPa·s

 

Ⅳ Application

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

Ⅴ 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

 

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.