... difficult crushing such as light material, materials of fiber type, brittle material and flexible material, etc. The ... shell, corn cob, stalk, starch, shelled shrimps of grain type, fish flour, seaweed, dehydrated vegetable, flavoring substance, Chinese date, ... mica, carbon, volcanic clay, perlite, distilled grain, furfural, cake type, charcoal, activated carbon, cellulose, potato slag, tea, hair, ...