BULK ORDER of 10 or 25 bags of clay at 10kg per bag. The Bulk options are best for schools, studios and workshops as are the most economical price per bag for purchasing this clay. Made especially for the classroom, this economical general purpose clay is suitable for handbuilding or wheel throwing at 50 mesh. It is recommended to fire in an electric kiln, bisque 1050℃ and can be glazed from 1080-1250℃.This clay needs high firing temperatures if vitrification is required. Shrinkage rate Bisque 5%. Earthenware 6 %. Midfire 9%. Stoneware 10%.