Dust-free chalk is an improvement on regular chalk, designed to eliminate chalk dust pollution in classrooms. It just adds oils or polyols as binders to ordinary chalk, and then adds fillers with a larger specific gravity, such as clay, marl, cement, etc., which can increase the specific gravity and volume of the chalk dust, and it is not easy to Scattered, but in practical application, its reducing effect on chalk dust pollution is not very obvious.
1. Add trace chemical raw materials to the main material, increase the specific gravity, write chalk on the blackboard, no dust flying phenomenon, clean and hygienic, and avoid occupational diseases caused by chalk foam entering the internal organs through breathing.
2. Add a small amount of lubricating agent and binder, the chalk does not stick to hands and clothes, and there are no white marks on the fingers of the teacher after a lesson, so you do not need to wash your hands.
3. Add a small amount of moisture-proof agent, and it will not deteriorate when stored for a long time. Ordinary chalk is very easy to absorb moisture when stored for a long time, the hardness decreases, and the writing is easy to break.
4. The blackboards used in schools include cement board, wood board and frosted glass board. Due to the different degree of smoothness of the surface of the blackboard, the degree of softness and hardness of the chalk is also different. The new generation of dust-free chalk can change its hardness at will, and it will not slip or break easily when used on various blackboards, and it is fluent, labor-saving and has a good hand feeling.
5. Dust-free chalk is a new high-tech product successfully developed in addition to cosmetic materials for production. Environmentally friendly, non-toxic and dust-free, it is an ideal teaching office supplies for modern teaching.
