Plumbers are steadily switching from copper pipes to plastic ones; and the Chinese have found a way of substituting the metal with cheaper aluminium in air-conditioning units.

水管工们已逐渐用塑料管代替铜管，中国也已用更便宜的铝代替空调元件。

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Copper, brass, bronze, aluminum, aluminum alloy stainless steel, rubber, plastic and other non-corrosive metals except specifically mentioned in this specification.

铜、黄铜、青铜、铝、铝合金、不锈钢、橡胶、塑料和除此规格书中涉及的其他非腐蚀金属。

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Copper and plastic coefficient of expansion, and, therefore, more close to the plastic used in electroplating electroless copper plating coating layer as conductive.

金属铜与塑料的膨胀系数比较接近，因此，在塑料电镀中常用化学镀铜层作为电镀的导电镀层。

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The bullish argument has it that the Chinese will find materials cheaper, even if only marginally, and will hence buy more of them: no more substituting plastic tubes for copper ones.

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In that cold, copper wire and plastic become brittle.

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To assemble these little critters, Ibiden has developed its own plastic resins and a new process for building up layers of plastic that contain intricate patterns of copper wiring (see diagram).

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