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Copper is the earliest metal used by humans


Copper is the earliest metal used by humans. As early as in prehistoric times, people began to exploit open-pit copper mines and used weapons to make weapons, tools and other utensils. The use of copper had a profound impact on the progress of early human civilization. Copper is a metal found in the earth's crust and ocean. The content of copper in the earth's crust is about 0.01%. In individual copper deposits, the copper content can reach 3% to 5%.

Copper in nature is mostly present as a compound, copper mineral. Copper minerals and other minerals are aggregated into copper ore, and the mined copper ore is subjected to beneficiation to become a copper concentrate with a high copper content.

If the bonding area is relatively large, the area of 10cm or more can be selected to be polymerized into epoxy resin and modified curing agent (AB glue). It does not need to be heated and cured. If it needs to be solidified, it needs to be warmed. In order to speed up the curing speed of the glue, the efficiency is also a kind of glue in the process of re-operation, and the bonding effect is also a very good product. Recommended glue: SL-806AB