In our common buttons, it can be roughly divided into plastic buttons (plastics, resins), metal buttons, natural buttons, etc. Each button is different in its production process. Although some buttons look the same in appearance, the use of internal materials is totally different.
For plastic buttons and resin buttons, since the plastic buttons are all formed by die-casting, there will be a line at the edge of the button. This is called a mold line. Some factories may remove this line during subsequent processing, and the appearance will become close to the resin button. However, the same amount of plastic buttons are lighter than the resin buttons, and the surface of the resin buttons will be smoother, but they are easily scratched and chipped. If placed in water, the resin buttons may also become soft.
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