Manufacturer of Electric Furnance - Box Furnace, Roller Hearth Furnace, Compact Tube Furnace and Microwave Furnace offered by SP Ceramics, Madurai, Tamil Nadu. Manufacturer of Electric Furnance - Box Furnace, Roller Hearth Furnace, Compact Tube Furnace and Microwave Furnace offered by SP Ceramics, Madurai, Tamil Nadu. Contact Supplier. Box