Wire wound resistors are made by winding the resistance wire on the alkali less ceramic core, then coated with noncorrosice, heat-proof and humidty proof material.
把电阻线绕在无硷性耐热陶瓷件上，外面加上耐热、耐湿及耐腐蚀之材料保护固定而成。
2
Color steel sandwich panel has a good fire proof and heat insulation performance for the characteristic of the color steel sheet and polystyrene material.
彩钢夹芯板有很好的防火和隔热性能，因为彩钢和聚氨酯都有这样的性能。
3
Biax-orientation Nylon6(BOPA) film is a new type of top grade packaging material with outstanding properties including cold-proof, heat-proof, oil resistance and good gas, water vapor barrier etc.