WHAT IS ONE PHASE EI CORE LAMINATION? One phase EI silicon steel sheet without holes or with 4 holes, which is to produce one phase EI transformers. The main size is from EI28-EI300 in our factory. Grade of raw material: 0.5 mm , W800, W600, W470, W400 etc. We are the specializing factory of EI LAMINATION、SILICON CORE、LAMINATION CORE、TRANSFORMER CORE、STAMPING CORE、MOTOR LAMINATION、SILICON STEEL COIL in Jiangyin,Jiangsu China.