The best materials for copper faucet products are formulated as follows: the content of copper is 59%---62%, the content of zinc is 39.5%---36%, and the content of lead should be less than 2.5%, because lead is toxic The higher the lead content, the greater the harm to the human body. The national lead content standard is less than 2.5%. Now most leading products use yellow copper. The composition of yellow copper is very complex and contains lead. The amount is very high, generally more than 3.5%, because copper materials with higher lead content are easier to process, and the production cost is lower. Strictly speaking, these products are unqualified.
2. Look at the production process of copper faucets
There are three casting methods for faucets: sand casting, manual metal casting, gravity pouring, or low-pressure casting. The first two have extremely low production costs and are relatively outdated production techniques. The last one has a relatively large investment, and each production line has Above several million yuan, the products produced by gravity pouring or low-pressure casting have reached the international advanced level.
In addition, there are a lot of blisters in the faucet cast by sand casting and manual metal mold casting, which are easy to leak and must be leak-proof. The method is to apply a layer of leak-proof glue to the faucet and then plate it. It cannot be recognized from the outside, so The cost is very low. Gravity pouring and low-pressure casting do not have blisters and do not need to undergo leak-proof treatment, but the requirements for materials are high, so the cost is high.
3. Look at the electroplating situation of the copper faucet.
The best plating and soldering process should be: first plating copper sulfate once, then nickel plating twice, and then plating and soldering twice. The copper faucet must be electroplated so many times in order to be shiny.
4. Look at the salt spray test on the surface of the faucet.
The national standard for neutral salt spray test is 200 hours, and the standard for acid salt spray test is 24 hours. These are national standards. Products produced are qualified only if these standards are strictly followed.