Q: The hot melt temperature is 320°C, and the plastic material is PC. After hot melting, regular scratches and copper powder were found on the surface of the nut. What's going on?

A: The copper powder dropped during the hot pressing process means that the copper rod used to make the nut is most likely a continuous casting rod. Under normal circumstances, copper nuts should be produced using extruded rods. Please check the information on the difference between continuous casting rods and extruded rods. In a nutshell, continuous casting rods are cheaper, but continuous casting has defects such as pores, looseness, and inclusions, and powder may drop or be scraped during hot pressing. You can verify with your supplier and suggest that your supplier replace the raw materials of regular manufacturers (such as Bowey, Jintian, etc.).

Q: The copper nuts used in our products are required to be completely non-magnetic and must pass the strong magnetic field test, so they cannot contain any magnetic non-ferrous metal elements. However, the C3604 brand still contains trace iron elements. 

Do you have such heat-staking inserts that do not contain any magnetic elements?

A: Almost all brands of brass materials contain trace iron elements, and the presence of iron elements is not a sufficient condition for metals to be magnetic. However, brass nuts do have slight magnetism. We have tested copper nuts made of red copper, but found that they still have slight magnetism. It is probably related to machining.

Annealing (note: annealing softens the nut and affects its mechanical properties, which is not a good solution) can make the copper nut almost unobservable under the action of a strong magnet. Here, it means that it is almost unobservable by human observation, and a small reading can still be detected by a gauss meter.

But your requirement is "completely non-magnetic", that is, 0 gauss. This should not be achieved.