Explanation/Annotation:Writings, molded. For coating of line and letter on class boards, over the surface of linoleum and surface of other objects.
Detailed model description:Technical characteristics.
1. Chalks amount, MM. Length: 85+-3, square side: 15+-2
2. Moisture, %, not more. 1
3. Chalks hardness (on decimal hardness scale), not more. 2
exterior appearance: at the surface of chalk shall not be permitted more than 3 cleavings by the length more than 2 MM in depth and 1 , 5 MM along. Crack on a side face of chalks shall not be permitted, except for shrinkage (not more 0, 1ìì of the overall picture of the the overall picture of not more 30 MM).
the prepackaging in board small box on 10 state and wood box |
