What are the common problems with potting glue?

1： What is potting adhesive.
Encapsulation is the process of mechanically or manually filling liquid polyurethane composites into devices containing electronic components and circuits, and curing them under room temperature or heating conditions to become high-performance thermosetting polymer insulation materials. The liquid polyurethane composite used in this process is the potting adhesive. Used for bonding, sealing, potting, and coating protection of electronic components.
2： What are the common problems with potting adhesive?
1. Evaluation of material damage to the vacuum system, or the impact of the stability of the vacuum system on quality
2. If the amount of adhesive used is too large or the service life is extended too long, resulting in "burst aggregation";
3. The apparent curing failure caused by the treatment of bubbles on the surface of the solidified material;
4. Evaluation of product changes caused by moisture during solidification;
5. Changes in environmental temperature leading to changes in the curing rate and fluidity of the adhesive;
6. Light colored cured materials may experience color changes due to conditions such as curing temperature and ultraviolet radiation;
7. Poor sealing after opening causes moisture absorption and crystallization;
8. Electrical engineers and Chemical engineer failed to design accelerated destructive aging life test according to the characteristics of A/B adhesive and the needs of electrical products;
9. Evaluation of various changes in the impact of curing temperature changes on the curing performance of materials;

10. Inaccurate weighing, uneven mixing, and incomplete solidification of the solidified material due to temperature or time;
11. Failure to stir before use, or failure to layer pigments and fillers during storage, resulting in curing failure
3： Summary of three reasons for non curing of potting adhesive
1. Whether the proportion is strict and whether the glue is evenly mixed;
2. How long is the curing time and whether it has not yet reached the time point for adhesive curing;
3. The sealant used for potting is thicker and thicker than the usual adhesive, so even by the time stated in the instruction manual, the adhesive may not have fully solidified.