Our company is the leading manufacturer of carbon raiser andAmmonium sulfite ,Ammoium bisulfite in China, and have got the national patent compared with our competitors. Application: used to improve the carbon content in steel-melting and ductile iron foundry.Also it can increase the quantity of scrap steel and reduce the quantity of scrap iron, or use no scrap iron at all. Characteristics: high carbon, low sulfur, few harmful ingredients, high absorptivity of carbon, with stable effect on improving the carbon content. Specification as follows: C S P H20 Size Ash Volatile weight ≥90% ≤0.5% ≤0.4% ≤0.5% 1-3mm,3-5mm,1-5mm 7% ≤1.5% ≥91% ≤0.5 ≤0.4% ≤0.5% 1-3mm,3-5mm,1-5mm 7% ≤0.5% ≥92% 0.3% ≤0.4% ≤0.5% 1-3mm,3-5mm,1-5mm ≤5% ≤1.5% ≥93% 0.2% ≤0.4% ≤0.5% 1-3mm,3-5mm,1-5mm ≤4% ≤1.5% 95.5% 0.16% ≤0.4% ≤0.5% 1-3mm,3-5mm,1-5mm ≤4% ≤1.5% Our Products with slap-up quality and low price have been exported to USA, Korea, Japan, South Africa, Israel, India ,Brazil and other countries. If you are interested in any items ,pls don't hesitate to contact us and we'll send you quotes and sample .