... product lime nitrogen . (3) Used in the generation This product is lumpy substance, its surface is a little deep gray, has slight nasty smell ... with air will form explosive gas (explosive range of acetylene gas in the air is 2.3% - 81%).Technical specifications and features1. NameCalcium ... 10(according to 1995 international relative atomic mass)10. SIZE4-7,7-15,15-25,25-50,50-80,80-120MM11. Packing50kg ...