材质：酚醛
表面处理：黑色
特性：平顶星形旋钮，防火阻燃性能好，导热低，使用范围广。
用途：工业自动化设备、航空、高铁、通信设备、电柜箱体及其它设备

Material: Bakelite
Surface finish: black
Features: Flat top star knob, good fire retardant performance, heat conductionLow, wide range of use.
Application: industrial automation equipment, aviation, high-speed  railway,Communication equipment, electrical cabinet and other equipment