The circuit board with black solder mask is called black oil plate. As we all know, in the presence of water, pure copper and oxygen contact each other, which is easy to cause copper oxidation
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The four-sided machine is also known as the four-sided edge wrapping machine, which has been positioned in the face paper and cardboard. After pre-pressing, the two sides are wrapped, the corners are
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Hangzhou Mei Wang Chemical Co., Ltd: Halogen free flame retardant manuafcturer focus on polymer industry, especially for PP, PE, TPE, PA6, PA66, etc. Besides flame retardant, we also provide flame
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