... hardness, such as soft mineral, brittle material, tenacious material, cellulosic material, etc. and substances that are apt ... substance, Chinese date, paper, circuit board, plastic, chemically raw material, mica, carbon, volcanic clay, perlite, distilled grain, furfural ... of chemical engineering, building material, medicine, health care, breeding, food and mosquito-repellent incense, etc.The Working ...