Recently, stirred widespread controversy in the market of

Gas Water Heater

Tank material from the “aluminum” instead of “copper”, will the recent new developments have emerged. Reporter was informed from a person familiar with the current market, individual water heaters used in business “real copper water tank,” and vigorously engaged in the stores, “pure copper” tank show, in fact most of the use of a “Baptist Lead and Copper”, not pure copper. Currently this “Baptist Lead and Copper,” the production process has been in Europe and the United States and other developed countries is strictly prohibits the use, in our country also belongs to backward technology, phased out.

It is understood, “lead and copper leaching” tank welding method is to immerse the lead content of copper up to 95% of high-temperature tin alloy solution, after cooling solidification made. Some enterprises to avoid the lead, known as “dip tin copper,” in fact essentially the same. An industry that the use of “dip galvanized copper” made of water tanks, tin content of about 15%, there can not be called true copper. And the water heater is used in high temperature environment, “lead and copper leaching” of lead metal waste water tank volatile smoke.

This copper nor that of copper

States

Gas Appliance

Product Quality Supervision and Inspection Center (

Foshan

) Examination Minister ZHANG Ming-wei told reporters on the market currently

Sell

Gas water heater in the “Copper” water tank, the main use of “oxygen-free copper” and “dip lead and copper,” the two technologies. However, only “free copper” closest to pure copper, copper content of up to 99%, without the use of lead solder, but the relatively high cost of manufacturing and technology.

Reporter was informed, lead and copper leaching technology started in the early 80s of last century, due to relatively simple production technology, product material cost is relatively low, the production technology still in use. However, in recent years because of lead pollution has plagued the production technology application and development of the market.

Before Fengxiang Shaanxi, Hunan and other places Wugang recurrence of child lead poisoning, lead in the production process so that the application of much community attention. Earlier, the EU has special out “WEEE”, “ROHS” double green directive stated that the

Home Appliances

And other consumer electronics products, do not use lead products and lead welding. The country has also introduced green then instructions on the home appliances, especially closely related to people’s daily lives

Microwave ovens

, The lead content of water heaters and other products made clear requirements and regulations.

But in recent years, some enterprises in order to reflect the market price competitiveness of products, still water heater products, extensive use of “lead and copper leaching” tank. Meanwhile, in the end the process of marketing and sales is not clear to consumers the “Baptist Lead and Copper” or “oxygen-free copper,” but rather fuzzy concept, unity of “copper water tank” to mislead the audience.

In the end what good?

Currently, the market for gas water heater, the tank material in addition to oxygen-free copper, lead and copper leaching, there are aluminum. Among them, the oxygen-free copper is mainly used for products with a higher market price, while leaching of lead and copper are applied to many low-end products, aluminum alloy is used in just-to-market of new products.

Previously, some businesses in order to promote sales, upset the market competition, have been reported by insiders, and other means of exposing shady operation, publicly questioned the aluminum alloy gas water heater. A Tsinghua University professor of engineering materials, told reporters, speaking from the thermal conductivity, preferably copper, aluminum and better lead the worst, “the Baptist lead and copper,” As the copper in the molten lead will be immersed in liquid to form a curing effect , thermal conductivity copper completely covered by the package lead, not play not a good thermal conductivity of copper.

Took the lead in “Al” material used in the water tank

Million and

Group, the related person in charge when interviewed admitted, 10 000 and the use of “aluminum” material purpose is to replace the “dip lead and copper.” In addition, 10 000 and water heater most of the use of oxygen-free copper. The forest, A? O? Smith’s products are already out of business “lead and copper leaching,” the use of oxygen-free copper material.

Reporters in Beijing, visited several stores and found that there are still some companies selling products using water heater “dip lead and copper.”