... 3. Used for transformers. EI lamination (silicon steel product):1) Specifications: EI24, EI-28, EI-30, EI-35, EI-41, EI-41 ... steel coils, such as Chinese steel4) Applicable to all kinds of iron cores for power transformers and ballasts EI30 Annealed I-30 ... (silicon steel product) transformer lamination,annealed lamination