... 1.Standard:IEC,ANSI,GB and etc. 2.It is usually red,gry and white 3.We ... drawings. 1.Standard:IEC,ANSI,GB and etc.2.It is usually red,gry and white3.We can design ... corresponding porcelain pin insulator and communicable with porcelain.The Post Composite Insulator is free from maintemance and manual cleaning ... voltage.3.The colour of silicon rubber,usually it is red or gray.4.Other particular requirement.