Button materials are roughly divided into plastic (resin, plastic), metal buttons (copper, iron, alloy), natural (shell, wood, coconut shell, bamboo). All kinds of materials need to be made into buttons, and the craftsmanship is not The same. Some buttons look the same in appearance, and even people in the industry may not be able to distinguish them clearly with their eyes, so they can only be distinguished by scraping off their coats.
Buttons distinguish between plastic buttons and resin buttons, plastic buttons and resin buttons. Plastic buttons (including various plastics) are generally die-casted, so there will be a line on the side of the button. This parting line may be in some factories. This line is removed in the subsequent processing, but its weight will be lighter than the resin (of course some special plastics will be heavier). Resin buttons are mechanically engraved and then polished, so there is no full mold line on the surface, which is very smooth. But it is fragile, the surface is easy to scratch, and it will become soft when placed in boiling water.
How to distinguish between copper buttons and iron buttons? :
For buttons made of copper and iron materials, you will know this by using a magnet, and use a hard object to scrape off the electroplated layer on the surface, and the brass color (golden) in the surface of the copper button. The iron buckle is black, which is the color of the raw material.
How to determine whether it is an alloy button? :
The alloy buckle is relatively heavy and is made of die-casting. All mold lines are generally polished and polished, which may not be visible, but it is heavy and solid.