... Ferrite and Strontium and, more recently, in rare earth Flexible material, Neodymium Iron Boron, all loaded into PVC binders. ... and calendering process. Higher magnetic characteristic/performance. Flexible material is obtained either by work rolling/hardening in the ... seal /construction system product 2>. EPDM as raw material,very strong anti-old chemical property,durable,convenient installaion, ...