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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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