Shenzhen Kingsway Industrial Co., Ltd. and Germany to share with non-toxic, non-toxic chalk chalk: It is the most healthy chalk chalk, gypsum plus pure water by coagulation and drying, non-toxic chalk from teaching, no chemical composition, the use of edible gypsum. Now most of the foreign education from primary school to use this piece of chalk, the only production base in Shenzhen, a non-toxic chalk Which is good, non-toxic chalk 23 years of production experience, own domestic brand Elena, Shenzhen and Germany Kingsway Industrial Limited. Shenzhen Kingsway Industrial Co., Ltd. and Germany are the main selling chalk crayons, colored chalk, chalk graffiti, healthy, non-toxic chalk color chalk graffiti, please call us to understand. Shenzhen Kingsway Industrial Co., Ltd. and the German share of the chemical composition of chalk, chalk is calcium sulfate dihydrate (commonly known as gypsum) is made. Can be added to a variety of pigments made of colored chalk. In the production process of the gypsum is heated to a certain temperature, non-toxic chalk, it becomes mature partially dehydrated gypsum plaster and then mixed into a paste with water, poured into the model solidified. Gypsum plaster becomes mature reaction (heating required): CaSO4 · 2H2O = CaSO4 · H2O + H2O. Gypsum plaster with water becomes a reaction to the (room temperature can be): CaSO4 · H2O + H2O = CaSO4 · 2H2O. And Germany Kingsway Industrial Co., Ltd. is specialized in Ai Nina chalk, chalk graffiti home, pastel and other products production and processing, if necessary, please call contact information on the Contact Us color picture toxic chalk, chalk Meizhou nontoxic, and Germany provided by Shenzhen Kingsway Kingsway Industrial Co., Ltd. and Germany. Shenzhen and Germany Kingsway Industrial Co. (hedehuifu.com) strong, credible, in Shenzhen, Guangdong chalk industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement and innovative ideas will lead Germany Kingsway and you hand into the brilliant, for a better future!