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brass faucet inspection by consumer-VIP tips
- Oct 08, 2018 -

In the face of the dazzling faucet on the market, how do we distinguish and identify the quality when we ensure that it is made of brass and different grade? Here are some tips to keep you from being tricked:

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In the above picture, the inside of the casing has a sense of sand left behind by the casting, accompanied by black dots and a golden or transparent lacquer layer. The machining marks are obvious, and the material exposed by the turned parts is relatively hard and has high gloss. This is a copper casting material.

The copper material is heated to a liquid state and then injected into a sand mold to form. Because the copper structure of the sand casting is loose, it is easy to have trachoma through the shell. Therefore, it must be soaked with special leak-proof paint (glue) and filled with negative pressure before machining, so there will be a transparent paint layer in the shell.

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The left side of the picture shows the sand casting, and the right side is the precision casting. The inside of the casting is rough, with strong sand grain and black small sand residue.

However, due to the different composition and precision of the sand and core of the castings using the mold, the precision castings are more precise, the structure is relatively dense, and there is no trachoma. Do not soak the trap paint.

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In the picture above, this is the true gravity casting. In a broad sense, as long as the liquid metal is poured from top to bottom into the mold, the casting method is called "gravity casting". However, in general, "gravity casting" refers to "metal mold casting." That is, the workpiece is cast using a metal mold. The workpieces produced by gravity casting are well formed, the dimensions are accurate, the appearance is flat, the structure is compact, and there is no residue. The product has good pressure resistance and long service life. The price of gravity castings is usually double that of sand castings and about 30% more expensive than castings! The black plastic part is the spool.

(Gravity castings will have similar paint-like pitting marks, no strong sand grain, no black sand residue)

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In the above picture, the interior is completely composed of machined lines, the internal material is hard, the gloss is good, and it is slightly yellowish. The above features are forged parts. Forging is to heat the metal billets and put them into the mold for stamping, so the forging process industry is also called "red punch". Then use the numerical control equipment to hollow the inside of the solid workpiece into the above picture, so the inside of the workpiece will be filled with beautiful machining lines.

Forged products are relatively high in strength and relatively low in processing cost compared to gravity casting. However, forging has limited styling ability and is only suitable for products with relatively simple styling.

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Copper pipe welding faucet. Like this tubular horizontal and vertical faucet, it is possible to be a copper pipe weldment. It should look like a copper tubular piece from the bottom.

Copper faucets are basically some of the above types of products. There are also some complex products that are manufactured in a mixture of the above processes.

Sorted by price and quality in the same weight:

1 gravity castings, forged parts (tied first)

2 precision castings

3 welded parts

4 sand casting