The light touch switch needs to be welded when it is installed. It will turn yellow after welding. What is the reason? The following will give you a good introduction to this issue.

Why does Dongguan touch switch turn yellow after furnace or reflow welding? There are many customers mistakenly believe that the button is not heat-resistant, in fact, it is not. If it is not heat-resistant, it can be manifested as plastic base deformation or plastic base melting and shrapnel deformation and other symptoms. The following is the cause analysis of the yellowing of Dongguan light touch switch after reflow welding. The specific contents are as follows:

According to the research and analysis of engineers, most of the yellowing of Dongguan light touch switch after reflow welding is made of 6T plastic material, because 6T plastic material itself is easier to absorb water. If this plastic absorbs less water, it is estimated that the change of keys after heating is not obvious, but if it absorbs more water. The discoloration is very obvious. But it has no effect on the function and life of the key itself, because the only change is the appearance color of the key.

This is why the light touch switch is yellowing in installation and welding. I hope you can understand and understand these problems.