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Symptoms

  • Soft Cure
  • Brittle
  • No Cure
  • Insufficient Physical Properties
  • Cracking
  • Excessive Shrinkage During Cure

Epoxy and Polyurethane compounds are widely used to encapsulate electronic circuits. Depending on the type of components contained in the circuit and the performance requirements for the finished components, it is critical to select the appropriate formulation. The type of fillers, pigments, thermal conductivity, the electrical properties, the amount of shrinkage during cure and adhesion to containers can all effect the output of an encapsulated circuit.

 

The Effects of Filler Settling

Many formulated compounds contain fillers to impart desired properties. The fillers are incorporated (mixed) into the resin and/or hardener or both at the time the products are manufactured. Although formulators take great care in selecting fillers and use various additives to keep them in suspension, there will be some settling occurring under certain conditions.

 

Epoxy and urethane compounds are best processed through automated dispense equipment, especially in high volume production situations. From time to time, problems are encountered due to various causes, resulting in the improper cure of the epoxy or urethane mix 

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