① morphological classification exists by nature
------ Natural copper free state of existence in nature of copper and copper content of 99%, but the reserves are very small;
Number of copper oxide is not more than -----
----- Copper sulfide copper content is very low, usually in 2 - 3% of more than 80% of the world's copper is refined from

sulphide copper out.
② Classification by production process
Elected before the smelting of copper concentrate ---- high copper content of ore.
------ Blister copper smelting copper concentrates, the products, copper content in the 95-98%.
Electrolytic copper ------ fiery or more than 99% after the content of copper. Fiery available 99-99.9% of pure copper,

electrolytic copper can 99.95-99.99% purity.
③ Classification by major alloy components
Copper, copper products -----
Brass, copper and zinc alloy -----
Copper tin alloy bronze ----- (in addition to zinc and nickel, the alloy by adding other elements are called bronze)
Copper-nickel alloy of Copper, Cobalt, Nickel alloy -----
④ patterns by product category: brass, copper, copper wire, copper, copper, brass, copper, etc.

Factors affecting the price of copper
a. the international economic situation. Commodity markets and the economic situation of the relevant point is obvious,

especially in today's increasingly globalized world economy, commodity markets and the economy have more relevance, so the

price of copper is closely related with the economic situation. Copper consumption concentrated in the developed industrial

countries, these countries such as USA, Japan, Western Europe, economic conditions in countries such as greater impact on

copper prices, in general, the economic situation, increased demand for copper, the price rise, and vice versa down.

b. producing countries, production status. Chile is the most abundant copper resources and the world's largest exporter of

copper, Zambia and Zaire in Central Africa is an important copper producer in the country, almost all the copper they produce

for export, production status of their great influence on the international copper market . The situation in these three

countries has been very stable government, labor disputes are often made, it is also a direct impact on copper prices.
c. seasonal effects. Seasonal fluctuations in copper prices more apparent in January each year for the nadir in August record

high.
d. the impact of industrial policy. Because copper is mainly used in electrical, electronics, construction, machinery and

transport, the country's industrial policy for these sectors have a more significant impact on copper prices.
e. the price of substitutes. In the telecommunications industry, copper has been an important 原料, but optical fiber Jishu

the popularization and application, the status of copper challenge the same time, aluminum and other metal materials and Tong

has the same properties, mostly used in place of the copper sector, a .
f. the impact of inventory. Inventory is one of the important factors affecting copper. Enterprises in different market

conditions will take different measures to increase or decrease in inventory. To ensure the production of raw materials or to

speed up cash flow, will be used at different times throughput reserves to stabilize the copper market.
g. other policies, laws and regulations of. As the copper market is an international market, international trade is big, so

an increase in the country's import and export policies, exchange rate system, anti-smuggling efforts and other factors

change, will have an impact on copper prices.

Copper thermal conductivity 386.4w / (mk) resistivity (20 ℃ pm) to 0.018Ω · mm2 / m
Brass thermal conductivity coefficient of 108.9 / (mk) resistivity (20 ℃ pm) to 0.071Ω · mm2 / m
Beryllium copper thermal conductivity 195w / (mk) high yield point, tensile strength and elastic good, but lower than the

conductivity of copper
Considering copper to be elected