Among the buttons we use daily, the materials can be roughly divided into three types: plastic (resin, plastic), metal buttons (copper, iron, alloy), and natural (shell, wood, coconut shell, bamboo). Each different material needs to be processed into buttons through different processes. However, after some buttons are processed and formed, it is difficult to judge their material only from the appearance. In actual use, how do we distinguish these different button materials?
In plastic buttons, it is divided into plastic buttons and resin buttons. Among them, plastic buttons are generally made by die-casting, so there is a line at the edge of the button. This line is also called the clamping line. Some factories will remove this line through process in order to affect the aesthetics during processing. In contrast, its weight is slightly lower than resin. Resin is mostly made by mechanical engraving and then polishing, so the surface is relatively smooth without any traces. However, resin buttons are more fragile and will become soft when placed in boiling water.
For metal buttons, there are three types: copper buttons, iron buttons and alloy buttons. It is relatively simple to distinguish between copper buttons and iron buttons, just try it with a magnet. Another method is to use a hard object to scrape off the electroplated layer on the surface. The copper button will appear brass color, while the iron button will be black. Because the alloy button is made by die-casting and the inside is solid, it has a mold line and is heavier. Basically, it will be polished and polished when it is formed.