... quality silicon steel slice,We choose material with high magnetic permeability low loss to material AdvantageInner iron core uses high quality ... main materiala areH18, H14, H12, Z11,27QG130.We choose material with high magnetic permeability,low loss to meet the requirement ... , which will bring transformer to a best situation.Inner insulating material adopts NOMEX made by du Pont de Nemours(USA),it ...