WL-4500LA/LB Polyurethane  Potting  Resin For PCB  

1.  Introduction

WL-4500LA/LB are two components series polyurethane casting materials, Excellent flexibility, weathering, electric properties and very low moisture absorption. for PCB of Washing machine etc.

2.  Properties:

Item

Testing Method or Condition

WL-4500LA

WL-4500LB

Appearance

Vision

Yellow Viscose Liquid

Pale Yellow Liquid

Viscosity

23℃ mpa·s

500±50

110±10

Mixture Viscosity

320±50

Density

23℃ g/ml

1.04±0.05

0.95±0.05

Pot life

23℃ min

45

Mixing Proportion

By Weight

A: B=110:100

Mixing Proportion

By Volume

A: B=1:1

Curing Condition

℃/hrs

60/3 or 25/24

Shelf Life

25℃ Airproof

3 Months

3  .  Application:  

Suitable for middle or small type electronic components potting such as PCB, igniter, etc

4.  Characteristics After Curing:

Item

Unit or Condition

WL-4500LA/LB

Hardness

Shore-A

30±5

Electric Resistance by Volume

25℃，Ω·cm

>1.0×1013

Water absorption Rate

24hrs, 23℃

<0.3

Insulation   Strength

25℃，kV/mm

>20

Elongation Rate

%

>150

5. Application Process:

1.    Pre-heating: Baking electronic components at 70~80℃ for 1~2hours to remove moisture;

2.    Mixing: Weigh certain amount of component A, then add component B per weight proportion, stir uniformly.

3.    De-bubble: The bubbles in the mixing materials should be removed by vacuum de-bubbling.

4.    Casting: Pore mixing materials into the required components at 60℃ for 3hrs or at 25 degree c for 24hours,or curing at room temperature for long time.

6. Storage, Transportation:

1.  It is non-dangerous materials. Storage and transportation per general chemicals regulation. Storage shelf life see storage barrel label.

2.  Pay attention to product specification and use right type product. Weigh correctly and stir uniformly.

7.        Packaging:

A: 20 Kg/Drum  Metal Barrel.  B:18 Kg/Drum  Metal Barrel.

  Note: The above data are typical technical data at 70% humidity and 25℃ as reference only.  

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