1. Excellent thermal conductivity and conductivity 2. Low coefficient of linear expansion 3. Good thermal stability and heat shock resistance 3. Chemical corrosion resistance not easy to react with most metals 4. At high temperature (above 800 ℃ for most copper based carcasses) the strength increases with the increase of temperature 5. Good lubrication and abrasion resistance 6. Easy to process, good machinability, can be made into molds with complex shapes and high accuracy