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What is the reason for the uneven surface of silicone adhesive after curing?


The functions of silicone adhesive mainly include bonding, fixing, filling, sealing and other applications between materials, and most applications that have special requirements on the surface after curing are filling and protection, and the general requirement is smoothness. For example, in the lighting industry, if the surface is If it is not flat, the light generated will change, so what happens to the uneven surface after the silicone adhesive is cured? What are the reasons for this problem?


01 Displacement, vibration

When silicone adhesive is used to fill and seal fixed components or other components, it must be ensured that the bottom is completely filled with glue after filling, because during the curing process, the bottom glue still has a certain fluidity due to the long curing time. The problem is not filled. When the surface is crusted and dried, the glue at the bottom will be displaced, which will cause the surface to be uneven after the glue is cured. In addition, the filled product should try to avoid collision and vibration.


02 Thickness

Silicone adhesive is used for filling. If the sizing is too thin, the curing process is also the process of changing the volume of the glue. There will be a certain shrinkage rate and internal stress. If it is too thin, it may cause shrinkage and wrinkling. Increasing the filling thickness can effectively solve this problem.


So what should I do if the surface is uneven after the silicone adhesive is filled and cured? In fact, it is very easy to solve. Reapply a layer of glue on the surface to fill in the uneven surface. Before reworking, confirm whether the glue has been deeply cured and completely before applying glue.

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